Furnace fan is constantly on, even with the thermostat turned off.

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Old 10-04-20, 07:35 PM
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Furnace fan is constantly on, even with the thermostat turned off.

I have an older Armana furnace.
When first give power to the furnace, everything will function normally until it reaches the set temperature. Then the furnace will not come back on, unless reset, but the blower/fan runs CONSTANTLY. I've even turned the thermostat to off and it will still run.
Any ideas what my issue could be?
 
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Old 10-04-20, 07:58 PM
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Welcome to the forums.

Is the blower fan AND the draft inducer fan running ?
If yes... that would indicate an overheat problem.
Check the blower door for a sight glass where you can see a blinking red fault LED.

Probably going to need a furnace model number. It will be on an ID tag inside on the sidewall near the burner.
 
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Old 10-05-20, 06:51 AM
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Model: GUCA090BX40
It blinks twice and gives a code of pressure switch stuck closed.
 
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Old 10-05-20, 08:06 PM
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Is the blower fan AND the draft inducer fan running ?
Very important.

The pressure switch is closed because it appears the draft inducer may be running.
If it's running and the main blower is not...... you may have a defective control board
with a sticking/stuck inducer blower relay.

Amana service manual - pdf
 
 

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