Quote:
Originally Posted by rick-l
The controller lights the gas burner and the limit switch turns on the fan but it just blows lukewarm air. The filter is clean and there is plenty of air flow. It is 13 outside and it has run continuously set to 68 maintaining 67.
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If you have a digital thermometer, place one in the main duct after the first heat run. Then place in the return air duct at the furnace. Check your temperature difference and report back.
Make sure you watch a complete cycle by the way. If you're not holding temp you could be cycling off of limit.