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Carrier Furnace Troubleshooting - PartsAPS

carrier furnace troubleshooting

Many Carrier furnace problems have easy solutions to get it working quickly as intended. So, you can do basic Carrier furnace troubleshooting if your system is not functioning properly. In this Carrier gas furnace troubleshooting guide, you will know how to find the cause and solve the issue quickly.

Carrier Furnace Troubleshooting Guide

Check here to know how to fix Carrier furnace common issues yourself.

Furnace Doesn’t Turn ON

If your furnace is not turn on, you have to check whether the thermostat is set correctly to heat mode or not. Sometimes, thermostat mode could be off or set on cooling mode. Otherwise, the set point temperature may higher than the indoor temperature that causes the unit to turn off until additional heat is required. So, you can try changing the temperature on the thermostat to be higher than the normal room temperature.

  • Make sure the thermostat in the furnace is receiving power.
  • Next, you need to verify the fan switch. Check the fan switch is turned to the "auto" or "on" mode.
  • Verify the circuit breaker to ensure that the furnace is still getting power.
  • You have to check the pilot light. If you are using an older furnace, the pilot light might be defective. You should relight the pilot light carefully if the pilot has gone out.
  • Check for the gas supply is still on.

However, if you find a gas leak or smell gas in your house, don't turn on/ off any switches. Moreover, you should not try to relight the pilot light. Call the gas company to check the issue.

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Carrier Furnace is Not Blowing Hot Air

Here are some common reasons and solutions for your furnace blowing cold air.

Thermostat issues

When you set the thermostat incorrectly, your furnace blows cold air from the heat registers. You can see a lower temperature reading on the thermostat than expected. Also, you can observe the unit is running.

However, there are numerous choices when it comes to the thermostat. All these features control the unit’s both heating and cooling programmable modes to take it a step further. Also, allowing you to schedule temperature changes throughout the day. Although, there are a number of scenarios involving the thermostat that can result in your Carrier furnace not blowing hot air.

If your unit is not blowing warm air, the first step you need to do is to check the thermostat in your Carrier furnace and then look for possible fixes.

  • Verify the thermostat is set for air conditioning instead of heating the air. If so, you have to simply reset the thermostat for heating or change the setting mode to auto. If you set it to auto, it will change between heating and cooling automatically as the temperature changes.
  • See if the fan is set to run constantly even when the unit is not heating the air. If it is, the furnace may circulate the cold air between heating cycles so change the setting to auto. Then, it will turn off the blower when the system is not producing heating.
  • Make sure the temperature setting did not set to the lower.
  • If your unit has a programmable thermostat, you need to review the comfort schedule for any issues and ensure that programmed settings have not shifted times due to daylight savings time.

If your furnace issue is not resolved even you made some changes, it’s time to take the help of a technician.

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Heater has not warmed up yet

If your heater is not warmed up, you can hear the unit’s kick on sound but it is blowing cold air. Many furnace models have a fan limit switch with a feature called "blower on delay". This function allows the system to warm up the air before the blower pushes it out through the ductwork and spread into the living areas. This short delay helps to keep you more comfortable by eliminating an initial blast of cold air from the heat vents.

Check the Carrier furnace manual for your unit to see if there is a blower delay after the burner kicks on. If you find the same situation even after a few minutes, you need to contact an HVAC technician.

Pilot light is out

  • You have to start by checking your thermostat that is set properly.
  • Next, find the pilot light assembly on the furnace and see if there is a flame.
  • If the system's pilot light is out, you should follow the owner's instructions to relight the pilot. If it will not stay lit, you can call a professional.

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Check the air filter

Check and clean the air filter if needed. As dirty air filters restrict the airflow, you should always keep it clean. A dirty air filter causing the heat exchanger to get too hot and the fan limit switch to shut down your furnace. An overheated furnace may damage the internal components such as the heat exchanger. You have to replace the air filter if necessary.

Carrier Furnace Turns OFF and On Constantly

Due to short cycling, your furnace keeps turning off and on continuously. This terminology is used to describe the problems originating from within the heating system. If you don't promptly diagnose and correct short cycling, it could cause permanent damage to your heating unit. The average heating system cycles on and off 3 to 6 times every hour.

Check the air filters. If you do not clean the air filter regularly, the hot air can't pass through it and it backs up within the system. Then, it sends the incorrect indication to the heating system that your house is already warm enough. To avoid this issue, replace the air filter at the start of each new season.

Inspect the thermostat. Sometimes the short cycling is not caused by the furnace itself and by a faulty thermostat. You should ensure that the thermostat is set to accurate settings. The thermostat place also makes a difference. If your thermostat is close to another heat source like direct sunlight or a heat register, it will sense the temperature in your building is too hot. Then your furnace will turn off.

Additionally, the problem may occur because of a corroded flame sensor, improper size of the heating system, and foreign objects lodged in the air vents.

Final Words

However, most of these Carrier furnace problems can be prevented with regular cleaning and maintenance. Carrier recommends you do not perform additional troubleshooting processes that you are unfamiliar with. Contact a qualified HAVC technician if your furnace is still not working properly.

About the Author


Haritha is a Content Writer at PartsAPS. She has a great understanding of today's marketing strategies that yield strong results and always happy to create valuable content & share her thoughts.

She was good at writing content for E-Commerce websites related to Restaurant Equipment Parts, Appliance Parts, Food Service Parts, HVAC Parts, etc.

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