My single stage furnace is blowing only cool air and the thermostat is not shutting off.Post created: 2016-05-02 Type of Equipment: Furnace Views: 66
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On 2016-05-02 Gary wrote:
Is there an LED light flashing an error code? This will help you diagnose the problem. If the light is flashing a code but you don't know what it means, there should be a sheet inside the front panel describing the error codes and their meanings. A problem like this is often caused by a dirty air filter, and other common causes are a faulty relay or circuit board.
We get a lot of questions in the forum about furnaces that blow cold air -- If you'd like to have a contractor take a look at this, we can help you find one, here.
On 2016-05-04 Diana wrote:
Hi Gary, thank you for your help.
LED light was flashing twice and code for that is external lockout. I did changed filter and clean the inside of furnace ( oh god a lot of dust ) ignition wasn't working before. But after replace filter and cleaning it started to work. But now I have another problem. I can not shut of from thermostat. Whenever I shut it off from thermostat, ignition, gas stops but not motor. It keeps running and after some time starts to blowing cold air. Do you think I need to replace thermostats too.