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Old 03-08-2014, 12:19 AM   #1
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RobertShaw thermostat fan stuck on


Can anyone help? My programmable thermostat fan is stuck on. The switch is in the "off" position. I took out the batteries and the fan is still on. The ac/heatpump is on the roof. Should I just replace the thermostat?

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Old 03-08-2014, 04:26 AM   #2
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RobertShaw thermostat fan stuck on


If the fan auto/on switch is stuck in the on position. Yes, time for a new thermostat.

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Old 03-08-2014, 09:49 AM   #3
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RobertShaw thermostat fan stuck on


Maybe the fan relay?
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Old 03-08-2014, 10:20 AM   #4
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RobertShaw thermostat fan stuck on


How would I know if it is the relay switch or the thermostat needs to be replaced? Where is the relay switch? If I replace the thermostat, will that also fix the relay switch?
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Old 03-08-2014, 10:56 AM   #5
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RobertShaw thermostat fan stuck on


Disconnect the red wire from the thermostat. If the fan stops running, the thermostat is bad. If the fan still runs, then the fan relay, controlboard, or wiring is suspect.
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Old 03-08-2014, 11:33 AM   #6
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RobertShaw thermostat fan stuck on


My electricity was recently turned off for another project. Could this have caused the fan to be stuck on?
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Old 03-08-2014, 12:08 PM   #7
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RobertShaw thermostat fan stuck on


I disconnected the red wire from the thermostat and the fan is still running. Where is the relay switch and how would I test it?
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Old 03-08-2014, 01:27 PM   #8
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RobertShaw thermostat fan stuck on


The fan relay and control board will be in the air handler. The next step is to remove the red wire at the air handler. If the fan doesn't run, then the thermostat wiring has been shorted. If the fan still runs, then you will need to provide the make and model of the air handler. Do you have a multimeter?
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Old 03-08-2014, 01:57 PM   #9
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RobertShaw thermostat fan stuck on


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Originally Posted by DDJ View Post
How would I know if it is the relay switch or the thermostat needs to be replaced? Where is the relay switch? If I replace the thermostat, will that also fix the relay switch?
Ah, so the fan switch is not "stuck on", its just your fan keeps running.

Could be the relay is stuck/burnt fast, or the limit is tripped. You need a multimeter. And then need to go on roof and check.
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Old 03-09-2014, 12:58 AM   #10
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RobertShaw thermostat fan stuck on


I will get a multimeter and check on the roof.
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Old 03-09-2014, 09:57 AM   #11
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RobertShaw thermostat fan stuck on


Is it a package unit? Or does it have an air handler inside the house with the heat pump outside unit on the roof? Where you need to check is wherever the blower motor is located. Hate to see you up on the roof for nothing.
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Old 03-10-2014, 09:19 AM   #12
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RobertShaw thermostat fan stuck on


I think it a package unit. I will ask if someone can come over and help me check these things and post a reply. Thank you

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