Lennox furnaces are quality units; however, similar to other furnaces, after some time, they can encounter their share of issues due to normal wear and tear or a lack of regular care and maintenance. When this occurs, you may notice that your furnace just doesn’t perform how it used to. Fortunately, many issues can be pinpointed and, in some cases, even repaired yourself.

When Lennox furnace troubleshooting, some of the most common issues include:

Lennox Furnace – Common Issues

The Furnace Won’t Start

If your furnace just stopped working, it could indicate an issue with the thermostat. Sometimes, either the thermostat has been switched off accidentally, or the thermostat has completely gone out. This can cause the unit not to come on. In this case it will need to be exchanged for a new one. Sometimes a circuit may have tripped, which can also cause the unit not to start.

The Furnace Is Not Heating

If you arrive home or arise in the morning to a cold house, it could be that the thermostat is set on a low setting, which can cause the furnace not to put out heat.

If the igniter fails, it will also cause the furnace not to produce heat. A dirty or faulty pressure switch, which monitors the burner to detect a flame, can also cause the furnace not to produce heat. If the flame sensor does not detect a flame, as a safety precaution, the control board will shut off power to the gas valve to prevent the furnace from heating.

The Furnace Won’t Stay On

If the furnace fires up but then shuts off after a few minutes, it could be that the control board is faulty. The control board sends power to the ignition system, which fires up the system. However, if the control board is defective, it may not be sending power to the ignition system, which will prevent the furnace from remaining on.

A defective pressure switch, which means it isn’t closing when the burner has sufficient airflow, could also be causing the firing-up process to delay. If the ignition process delays, it will cause the furnace to shut off. If the flame sensor does not detect a flame, it will also cause the furnace to shut off.

Tools You’ll Need for the Job

4-In-1 Screwdriver

Lennox furnace troubleshooting often involves inspecting the unit’s inner components. Therefore, you will need a 4-in-1 screwdriver to remove the furnace covers and inside panels in the burner, so that you may access the parts.

Flashlight

Depending on where your furnace is located, it may be dark in and around your unit, in which case, you will need a flashlight for viewing the furnace area.

Multimeter

For more extensive Lennox furnace troubleshooting, such as checking the system’s voltage, current, and resistance, you may consider purchasing a multimeter, which is an electronic measuring instrument with probes that allow you to connect to various furnace components.

Lennox Furnace Troubleshooting

Check the Thermostat

When Lennox furnace troubleshooting, first thing’s first. If your furnace won’t come on or is not putting out heat, simply check that the thermostat is on and set to the correct setting. When the thermostat setting is set too low, it will cause your furnace not to put out heat.

If your thermostat uses batteries, you should also check the batteries to see if they need to be replaced, which will also cause the system not to come on, and replace the batteries if needed to see if it helps.

Check the Power

A tripped breaker is another common cause of a furnace not coming on, so check the circuit breaker to be sure it is not tripped. If it is, simply flip the breaker back on to see if it helps.

You should also check that the furnace switch, which is usually located on the side of the furnace, is flipped to on, and then flip the breaker off and then on again to see if it helps.

Check the Air Filters

If your Lennox furnace uses a disposable filter, it may need to be changed. In fact, it is recommended that the filter is changed once every three months. If your filter hasn’t been changed in a while, simply check the filter to see if it is dirty. Afterward, replace it with a clean filter to see if it helps.

Check the Pilot Light

If the pilot light is out, follow the instructions in your owner’s manual on how to relight it, and then try to relight it. If it still does not come on, the pilot light housing might need to be cleaned. Simply turn off the gas leading to your furnace, and then clean the light housing.

If the pilot light still does not come on, there could be an issue with the gas flow at which time you will need to contact a professional HVAC technician for help.

Caution Notes

Because various furnace components involve dealing with gas and fire, which can be dangerous if not handled properly, if you are not comfortable with performing Lennox furnace troubleshooting on your own, it is best to contact a professional technician who is highly skilled and trained in dealing with furnaces for the safe inspection and repairs of your unit.

Likewise, there are some repairs that should be left strictly to the professionals, such as replacing the gas valve. This requires calibration to your home’s furnace specs and gas pressure because it can damage the part as well as your system if it is not installed or calibrated properly.

Final Thoughts

Lennox furnace troubleshooting is simple and can be done on your own in just a few steps. In some cases, can even prevent the need to contact a professional. It also helps gives you a better understanding of your unit and how it works. Troubleshooting your Lennox furnace can be rewarding, knowing there are some things you can do on your own to help remedy the problem.

Wouldn’t it be great if your Facebook and other friends knew they had the same ability? Feel free to share this article with them! In the meantime, after trying these Lennox furnace troubleshooting tips, be sure to share your insight with us.

Your furnace utilizes various components that work together to provide cozy warmth throughout your home during the colder months. Therefore, when one or more of the furnace’s components are faulty, it can result in the furnace blowing cold air.

Some of the most common issues that result in a furnace blowing cold air include:

Cause #1: The Thermostat Is Set on the Wrong Setting

If your furnace continuously runs or the unit only blows out cool air sometimes, it could simply be that your thermostat is on the wrong setting.

Solution

Turn the thermostat setting to AUTO. When the fan setting is set to ON, it causes the furnace to blow out air even though the furnace is not producing heat. This can result in the furnace blowing cold air.
However, if you set the thermostat to AUTO, it will only blow out warm air.

Cause #2: Faulty Pilot Light

A faulty pilot light, including a pilot light that doesn’t come on or a pilot light that doesn’t stay on, can also cause your furnace to blow out cool air.

Solution

• First, relight the pilot light and see if if remains on. If not, check the gas flow to the furnace to ensure it is receiving fuel.
• Next, check that the furnace’s gas valve switch is on and that gas is flowing into the furnace.
• If the pilot light is dirty, it can also obstruct fuel from flowing through the furnace. Consequently, if the pilot light is dirty, clean it to restore proper gas flow.
• Grime build-up on the burner can also cause the pilot light to have problems lighting, so have your burner cleaned to see if it helps.
• A faulty gas valve can also cause your pilot light not to stay lit. If it has been a while since your furnace has been cleaned, it can accumulate dirt and debris, which can cause your valve to stick and prevent your pilot light from coming on.
• Issues with the thermocouple, which is a sensor that manages the ignition as well as the gas valve, can also cause your pilot light not to stay lit. So if you have a faulty thermocouple, be sure to adjust or replace it to restore heat to your furnace.

Cause #3: Faulty Electronic Ignition

Newer furnaces utilize an electronic ignition, which can cause problems if it is not adjusted properly.

Solution

Inspect the electronic ignition, and then have it adjusted or replaced if needed to restore proper function.

Cause #4: The Filter Is too Dirty

A dirty filter obstructs airflow over the unit’s heat exchanger. This causes the furnace to run longer until eventually, it runs hot.

When the furnace gets too hot, it trips the high-temperature limit switch. This forces the burners to shut off, so the heat exchanger doesn’t get damaged. However, the blower continues to blow to keep the furnace at a safe level, which can result in the furnace blowing cold air.

If you notice that the furnace blows out warm air and then cool air, or it stops blowing out air altogether after a while, it could be that a dirty filter is causing the furnace to overheat.

Solution

Shut off power to the furnace, and then inspect the filter. If the filter is dirty, then clean it or replace it, and then reset the system.

Cause #5: The Condensate Line Is Blocked

If your furnace is a newer high-efficiency model, and you notice water flooding around the unit, it could be due to a blocked condensate line.

When the condensate line is blocked, typically by dirt, dust, mold, or ice, it causes water to back up into the unit. This causes the furnace switch to shut off to prevent water damage.

A broken condensate pump can also cause the condensate line to overflow.

Solution

• To unclog the condensate line, first shut off the power to your HVAC system.
• Locate the drip pan on the interior air handler unit.
• Use towels or a wet dry vac to remove moisture from the pan.
• Wash away any contamination from the drip pan with soap.
• Use the wet-dry vac to clear the block from the drain line. If the vacuum does not clear the clog, try running a pliable rubber tube through the line to clear the clog.
• You also need to clean the drain line at the entry point. Remove the PVC cover, and use hot water with a mild soap to clean out the drain. You can also use distilled vinegar to clean out the drain.
• Allow the soapy water or vinegar to sit for about a half hour. Afterward, rinse the line with fresh water, ensuring water flushes through the entire line freely.
• If the condensate line is clogged by ice, try covering the line with pipe insulation and heat tape to prevent the contents from freezing.

Cause #6: A Leak or Clog in the Ductwork

Cracks, holes, and gaps in the ducts allow cold air from the attic or crawlspace to enter into the ducts, which can make it feel like your furnace is blowing out cool air.

Dirt and debris accumulated on the inside of the ducts can also hinder airflow.

Solution

Inspect the ducts in the attic or crawlspace and around the unit for cracks, leaks, and gaps in the ductwork. Afterward, have a professional technician repair any openings if needed.

Summing Up

A furnace blowing cold air can be caused by various issues with your furnace’s components, many of which you can address yourself. However, for more serious issues with your furnace blowing cold air, contact a technician who is highly knowledgeable and skilled in the inspection and repair of a furnace blowing cold air to prevent damaging your system.

A heat pump increases energy efficiency in your home by collecting outside heat and bringing it inside during the colder months and eliminating heat from inside during the warmer months. The heat pump is part of a two-part compression refrigeration system. It consists of an air handler, which is installed indoors, and an outdoor unit, or the heat pump, which looks similar to a central air conditioner.

When the heat pump is on the fritz, there are generally three common issues. This short guide on heat pump troubleshooting will help you troubleshoot these problems.

Heat Pump-Common Issues

Heat Pump Doesn’t Power On

If the heat pump fails to come on, it could be a sign of an electrical problem. Sometimes a tripped circuit breaker can prevent the heat pump from powering-up, even if the circuit breakers associated with the heat pump do not look tripped, it may still need to be reset in order to power the heat pump.

Corroded or worn wires in and around the air handler and the heat pump can also cause the unit to fail to come on. Sometimes oil, grease, or refrigerant can leak onto the wires and other parts, which can hinder the heat pump’s operation.

Sometimes the toggle located inside the control panel of the furnace or the light switch located on the side of the unit has been accidentally shut off. This can also cause the heat pump not to come on.

Heat Pump Doesn’t Heat the Whole House

Heat pumps, though pretty efficient, may have difficulties in frigid weather, when temperatures reach negatives. If you find that your home is chillier than the thermostat settings, it could be due to a faulty thermostat, low refrigerant, leaky ducts, dirty unit, or a faulty valve.

Ice Build-Up

Since the heat pump is located outside, it is subject to heavy moisture and frigid conditions, such as wind, snow, and ice. These elements can hinder the defrost cycle, which is a default mechanism built into the heat pump that thaws the snow and ice off the heat pump. Ice build-up can also be caused by an outdoor fan problem, low refrigerant, or an outdoor unit that is blocked.

You can create a barrier around the unit to protect it from extreme weather conditions, and regularly clear off any snow and ice during winter storms to help eliminate ice build up.

Tools You’ll Need for the Job

Cordless Drill or 10-in-1 or 5-in-1 Screwdriver

You will need a cordless drill or a 10-in-1 or 5-in-1 screwdriver for removing screws from both the handler’s casing as well as the heat pump’s casing in order to access their components for inspecting.

If using a cordless drill, be sure to invest in a Phillips screwdriver 1/4 inch bit and a 5/16 bit. Also, using magnetic tips help make your job easier.

Digital Multimeter

If you are skilled at measuring voltage, a basic digital multimeter can be used to check the voltage on the heat pump equipment.

Heat Pump Troubleshooting

The steps for troubleshooting the handler and the heat pump are similar and are as follows:

1. Check the Thermostat

The first step to troubleshoot your heat pump is to ensure that the thermostat is set to the right temperature setting. Make sure it is set to the heat mode. You could also try testing the thermostat’s operations when the unit isn’t running to see if the air handler cycles on. If the system has a low battery, swap it with a new one. If these methods do not work, you could have a faulty thermostat.

2. Check the Power

Be sure the main circuit is on. If the circuit is off, flip the switch to reset it.

You should also remove the unit’s service panel using a screwdriver or a cordless drill. This is to be sure the switch located on the inside of the unit, that resembles a light switch, is positioned up.

The pump may also have a power switch on the inside panel. Remove the panel using a screwdriver or a cordless drill, and inspect that the switch is flipped on. You should also inspect for damaged wires, which can also cause power issues.

The pump may also have a power switch on the inside panel. Remove the panel using a screwdriver or a cordless drill, and inspect that the switch is flipped on. You should also inspect for damaged wires, which can also cause power issues.

When replacing the panel, be sure it is secure. A loose panel can also cause the unit not to power up.

3. Check the Outdoor Unit

Remove the panel from the outdoor unit using a screwdriver or a cordless drill. Afterward, inspect the coils for ice build-up and the wires for damage. However, do not use sharp objects to chip ice build-up from the coils. This can cause serious damage as well as personal harm. Instead, use warm water to melt the ice and snow.

4. Check the Vents and Filter

A dirty filter or blocked vents can cause your system to short cycle or transport insufficient air supplies throughout the house. Make sure the filter is clean and the vents are not blocked.

Caution Notes

Heat pumps are sensitive systems with intricate parts, which require skills in order to avoid damaging the system. Furthermore, working around electricity always involves the risk of shock or an electrical fire. Be sure to shut off the power at the breaker box as well as the exterior shut-off box near the unit when heat pump troubleshooting.

Heat pump troubleshooting also involves exposure to refrigerant gas and other gases. If exposed to for too long or breathed in, they can cause allergic reactions and other side effects in some individuals.

Final Thoughts

These heat pump troubleshooting steps can be done on your own to help determine your heat pump problem. If after trying these heat pump troubleshooting steps, it still doesn’t address your issue, then it may be time to contact an HVAC repair person.

Have you already tried these steps and saved time and money on your heat pump troubleshooting? Feel free to share your comments below.

People who live in studio apartments, compact living spaces or work in smaller offices often choose wall heaters. They are preferred because they produce a comfortable amount of heat, which is great for the situations we mentioned above. They keep small living or working zones warm, using up very little floor space. We all know how annoying it is when your wall heater stops working, right? Luckily, on the Williams website, you can find useful Williams wall heater troubleshooting steps. Here you have the steps you need to follow for the Williams wall heater troubleshooting process.

Common Issues

• The heater is not blowing warm air but either cold or cool. This can happen because of a dirty air filter or a leak in the duct system. You may not see it unless you go into your attic or crawl space. Check any pilot light issues to see if the gas valve is on. If not and you cannot light it, call a professional. There may also be not enough or not any fuel in the heater system.
• The device will not stay on or lit. Some of the newer heating systems are electric and don’t have a pilot light. In this case, it might be that a sensor needs is dirty and needs to be cleaned off.
• The heater will not turn off at all. It is possible that the switch is turned on auto instead of in the on position. If this is not the case, the thermostat or furnace may be broken. Replacing a thermostat can be a do-it-yourself task, but you may need to hire a professional to replace your furnace.
• If none of these steps have fixed the problem, please contact a Williams wall heater troubleshooting professional for further instruction.

Tool You’ll Need for the Job

• 8 to 12-inch adjustable wrenches – for removing the heater control knob
• Philips Flat head screwdriver – for loosening the knob stem nuts. You will also need it for face plate mounting screws and removing the unit from the wall.
• Clean rag – for cleaning off the dirt that might be on the sensor or on the ducts.

Don’t any of these recommended tools or steps fix the problem with your wall heater? Please contact the Williams wall heater troubleshooting service.

Furnace Troubleshooting

• The pilot will not stay lit even after following the lighting instructions. This could be from loose of dirty valve connections or a defective generator or gas valve.
• No gas is going to the main burner – this could be from something as simple as the gas valve not in the on position or the furnace not plugged in. Also, a defective thermostat or valve could be the problem too.
• The furnace is working but shuts off before heating up the room or is not producing enough heat – this could happen if the furnace you installed is too small for the area it is trying to heat or simply where you can find the thermostat.
• The furnace is working but won’t shut off when it finally reaches the temperature desired – this can be from a defective thermostat or the thermostats wiring itself having an issue or a valve can’t close.

For any questions or concerns about these issues with your furnace, please refer to the Williams wall heating troubleshooting.

Caution Notes

• Please let the furnace come to a cool down before examining it to prevent burns.
• Never open a flue so that you expel gases into another room, a fireplace or any part of the inside of a building.
• Do not allow clothing or other flammable or combustible items on or around the furnace. If you are unsure about what is and is not safe around the furnace or heaters, please refer to the Williams wall heater troubleshooting.
• It is best to wear your own protective gear, for example, gloves and safety glasses, so to help in avoiding any injury by possible sharp metal ends or if you are standing around the furnace as you are cutting or drilling a hole in wood or metal.
• Another good way to prevent any damage is if you are working with wires, label all of them prior to disconnecting them if needed. If you are unsure about the proper wires to disconnect, please refer to the Williams wall heater troubleshooting.
• It’s a good idea to set the thermostat to the lowest temperature while working on the furnace or heating system.
• It’s also a good idea to turn off all electric power to the heater while you are doing any adjustments to it.
• It also helps to keep the burner and control compartment areas as clean as you can
• In the case that you have a gas heater and you do smell gas first thing is to open all windows. Keep all appliances off, stay away from and do not touch any electrical switches. If you need to use your cell phone, step out of the house and do not use any landline phones while inside your house. If you happen to have a flame going such as in a fireplace, extinguish them. When outside with your cell phone, then call your gas company or if you do not have a cell phone available, please use a neighbor’s phone. The gas company may give you instructions but in case you cannot reach the gas company, call the fire department and the Williams wall heater troubleshooting to speak to a specialist immediately.

Conclusion

Even though wall heaters are very safe, always take into consideration that where you place your furniture is important. When it comes to a wall heater, it is best to keep them away from the outflow of heated air. That is really the only safety procedure one should consider when using a wall heater otherwise it has many excellent benefits.

With this, repairs are usually very minimal. However, if you do have questions or concerns about your wall heater and need some professional assistance, please contact the Williams wall heater troubleshooting service either by calling Williams or referring to their website for questions or instructions.

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This Rheem Classic 90 Plus troubleshooting guide is a go-to solution if your furnace stops working. The goal of this guide is to help identify the problem and find the best solution. Keep in mind that it is NOT a Do-it-Yourself guide. It is useful in case of an emergency, only when an experienced service member is not available.

The Rheem Gas furnaces are energy efficient units, designed to work for a long time. The heat exchanger made of stainless and aluminized steel provides corrosion resistance. Moreover, the blower section is insulated to decrease noise. There is also a direct spark mechanism ignites the Rheems furnace pilot light, for quick lighting.

Our Favorite Rheem Gas Furnaces

Rheem Classic 90 Plus Furnace – Common Issues

Common issues you may encounter during the Rheem Classic 90 Plus troubleshooting.

Periodically perform standard maintenance to ensure the furnace operates satisfactorily for years. Always clean your unit before starting it for the winter season.

• The first common issue is the Furnace is not putting out heat. The furnace is turned on, and you hear it working, but there is no heat coming out of the vents.
• The furnace is not igniting. You push on the igniter, and it will not ignite the unit.
• The heater is running all the time even when you lower the set point. It does not seem to stop running or shut off when it reaches the setpoint.
• The unit is running hotter than normal. When you touch the housing, you feel it is hot to the touch.
• The unit is heating certain rooms and not others. Some rooms do not get any heat while others are comfortably warm.
• The gas bill is running exceptionally high compared to the average winter usage. The gas company is sending you notices of your higher energy consumption.
• You see too much Soot or detect a strong gas smell.

Tools You Will Need

Caution: before you start the troubleshooting, turn off the furnace. Unplug from the power supply and remove the control door. Allow the gas in the lines to clear by turning off the gas control switch and wait 5 minutes. Make sure you do not smell any gas. If you detect a strong gas smell, stop and leave your house. Immediately contact the local fire department and your gas company.

To effectively fix the common problem, you will need the following tools:

• A ¼ inch or a 5/16 inch nut driver or a bit
• a cordless drill used to service the parts
• An insulated handle screwdriver
• A handheld vacuum
• A Multi-Meter used to test the Thermocouple.

Rheem Classic 90 Plus Furnace Troubleshooting

Please follow this Rheem Classic 90 Plus troubleshooting guide to fix common problems.
Some of the troubleshooting tips that might save you time are as listed below.

1. Power

One of the most overlooked issues is Power. Always check that your furnace is plugged into the wall outlet and turned on. Check to see if the thermostat setpoint is higher than the indoor temperature. Press the reset button, no more than twice to reset the unit. If there is no power coming into the unit then, reset the circuit breaker if it was tripped off. Replace fuses with broken wires or if they turned black.

2. Thermostat Batteries

Check the thermostat batteries and replace them when necessary.

3. The Furnace

If you there is no heat out of the unit and no gas smell, then, turn off the furnace. Unplug from the power supply and remove the control door. Turn off the gas control switch and wait 5 minutes then remove the filter from the front panel. Replace the filter or remove the accumulated dirt and debris with a hand-held vacuum. Clean the filter with warm water and a few drops of dishwashing liquid. Rinse and air-dry thoroughly before inserting it in the furnace. Turn the switch to “On” position and close the control door. Turn on the furnace power.

4. The Igniter

If the igniter not on, then relight the pilot if it was turned off. Clean around the pilot light if it does not light and dry up any water. Use an insulated handle screwdriver to test the transformer. Check if the current arches when it touches one of the contacts. Replace the transformer if the current is weak. Replace any corroded or broken wires and electrodes.
Change the pilot thermocouple if all the previous items check.

5. The Combustion Chamber

If the unit is running hot, place your hand near the door of the combustion chamber. If it is hot, then the system has a blockage. Clean the chimney, the duct pipe, and the combustion chamber. Check and replace the heat exchanger and gaskets if broken.

6. The Vent

Check when the heat comes on if it heats up certain rooms only. If so, place your hand on each room’s vent and, if you don’t feel any airflow coming out of those vents, then clean their ducts. Replace any crushed or broken exterior piping. Clear any obstruction from interior vents.

7. Replacing the Thermostat

If your heater is running all the time even when you lower the setpoint, then replace the thermostat.

8. Efficient Appliances

If your gas bill is higher than your average, then you may have added an inefficient appliance. It may increase your energy usage.

9. Emergency Advice

If you see Soot or smell gas, immediately turn off your furnace and leave the house. Call the fire department or the local gas company. Return home when you get a clear communication that it is safe to return.

Caution Notes

Immediately turn off your furnace if you smell gas. Contact your gas company or the fire department and leave the house. Do not enter your home until you receive the clear signal.
Keep all combustible material away from the unit.
Remain clear of heat sources while performing the Rheem Classic 90 Plus troubleshooting.

Be aware of dust and allergens while cleaning your filter. Please use precautions if you have any respiratory issue.
Immediately, contact your physician if you experience a severe allergic reaction. Or go to the nearest emergency room if you have difficulty breathing or swelling of the tongue.

Conclusion

We hope the Rheem Classic 90 Plus troubleshooting guide shed light on problems your furnace may encounter. And the recommended fixes needed during its lifetime. If you find this information helpful, leave us a comment in the section below. We welcome your feedback and value your input.

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