Question about AmcorAire UCHW-H12AF2 Split System Air Conditioner

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Fan runs constantly on cool mode

The cooling fan never shuts off in the cool mode. Worked perfect last summer. Works perfect in the heat mode. The heat pump shuts off and cycles as normal but the room temp isn't maintained in the cool mode. just gets colder. I'm thinking the relay must be stuck or maybe a bad temp sensor.

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Unit too large for area

Posted on Jul 03, 2011

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Simple Question: Did you check to see if the fan switch on the
t-stat is in ON or AUTO? If ON the fan runs nonstop. If in auto the fan cycles with the outdoor unit.
next does the fan shut off if you turn the t-stat to off?
A stuck relay should keep the fan running all the time.
Sometimes if the relay is stuck you can whack the side of the Air Handler and the connection will break.
Sometimes instead of a relay there is a stack switch.
It's a little black stack of 3 disks this is a bi-metal switch.
they do get stuck more often than relays.
The fan relay may be on a electronic board. I don't know for sure without seeing your unit.
Good Luck Phil

Posted on May 20, 2008

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