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When very cold my furnace does not turn on warmer only sometimes

\015 I have a carrier unit. When it is very cold the unit does not come on. When it is warmer it comes on sometimes. My therm. is set at 71 deg. and it is only 61 - 63 in my house. The therm. is 13 years old and so is the unit. Sometimes the air can be a little cool when it does come on. We had a part put in that is to help ignite it, but that did not work. It looks like a plastic thick tuning fork about 6 inches long. My husband can push the button to ignite it, but it doesn't stay on.\015

Answers :

It sounds as though your thermostat isn't reading the temp correctly anymore. Its the only thing that tells the unit to come on and it may be short cycling because of the tstat. When the unit first comes on, its going to push the cold air out of the ducts first before the warm air and this is normal. I would replace the thermostat first because it is the cheapest part of the unit and wouldn't hurt since it is 13 years old. You will find that a new thermostat will be more accurate anyway and tend to save you some $$ on your electric bill. I hope this helps.

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