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Furnace repair: how does a gas furnace work?


Before you can go ahead troubleshooting or repairing a gas furnace, it is important to understand exactly how it works.

Basically, a gas furnace takes in the cold air, cleans it through your air filter, then heats the air up with a gas burner before distributing the warm air through your home's ductwork.

The heated air eventually cools down in your home's various rooms and then makes a trip back to the furnace through return air grills and ductwork, where the process starts all over again.

If you are experiencing problems with your gas furnace, it is usually best to call your local Twin Cities heating and cooling professional to address the problem. However, there are some quick do-it-yourself tips you can do to troubleshoot your furnace problem.

What to do if your gas furnace produces no heat:

  • Check that thermostat is in heat mode and has appropriate temperature setting
  • Move the dial setting up or down a few degrees
  • Check that the circuit breaker or fuse controlling the furnace is not tripped or blown
  • Check to make sure pilot light is not out

What to do if your gas furnace is noisy:

  • A higher pitched "squealing" sound may be caused by slipping blower belt or motor or shaft bearings in need of oiling
  • A lower pitched "rumble" sound may be caused by a poorly adjusted pilot light if this problem occurs with the burners off.
  • A lower pitched "rumble" sound may be caused by dirty gas burners if the problem occurs with the burners on.

Your local Twin Cities Carrier dealer is always ready to answer any of your furnace questions or help you with your home heating needs. You can check out all of Carrier's gas furnace options here.

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