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I have an Amana Air command 80. When you turn on the heat it…

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Hi. I have an Amana...
Hi. I have an Amana Air command 80. When you turn on the heat it comes on and does everything correctly except when it get to set temp on thermostat it won't stop. Fan continues blowing,fire still on. When I turn thermostat to off the fan remains on and sometimes shuts off after a while and sometimes not. I've replaced thermostat twice, no change.
Submitted: 2 years ago.Category: HVAC
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Answered in 14 minutes by:
1/19/2016
HVAC Technician: hvacexpertjoe, HVAC Technician replied 2 years ago
hvacexpertjoe
hvacexpertjoe, HVAC Technician
Category: HVAC
Satisfied Customers: 183
Experience: I have owned and operated 2 HVAC companies in KY an WV. My background is electrical engineering.
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Since you have already replaced the thermostat then other possible causes are that the R and W1 terminals in the furnace are touching somehow causing the heating mode to stay on. This can be caused by bare thermostat wires touching, thermostat wires pierced by metal somewhere, thermostat wires rubbing against sharp metal surface, or a micro relay on the furnace control board has welded itself in the "on" position requiring replacement of the control board. You can test this theory with a volt ohm meter. While in heating mode the "R" terminal and the "W1" terminal should be 24 volts AC to common(or C terminal). When heating is off "R" is 24 Volts AC and "W1" will be zero volts AC.

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HVAC Technician: hvacexpertjoe, HVAC Technician replied 2 years ago

If you don't have a meter you could run thermostat and turn heat down so unit should shut off. While the unit is still heating remove the W1 wire from the furnace circuit board. If the heating stops you know the issue is with the thermostat wiring. If it continues then the circuit board is bad.

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Customer reply replied 2 years ago
Thanks! It looks like a relay. Stuck closed. I'll get one and replace. Hope there's nothing else down the line.
HVAC Technician: hvacexpertjoe, HVAC Technician replied 2 years ago

Ok.Good luck.

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