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When I turn it on to the heat cycle the fan does not run, I have swapped the control board with another unit that was working and still get the same result the unit runs on all other cycles.

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This is not true if your system is a heat pump. When the thermostat calls for heat, and the burner ignites the gas, a thermal sensor switch senses when the hot box has heated and then the sensor turns the fan on, this is so no cold air is blown into the ducts and living space. Also, another sensor senses the heat box if it gets too hot, cuts out the burner, if this sensor is not working then the burner will never light. Two sensors that may be keeping the heat from working among other possible causes, one step at a time in trouble shooting. Does the burner turn on at all?

Posted on Apr 25, 2015

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Posted on Jan 02, 2017

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I have a airwell GC-30RCC when put on heat the fan on the indoor unit wont kick in it works fine on cooling and plain fan mode but not on heat mode the red fan light is on too


How do you get it to kick in ?.Fid you spin it by hand ,if that's what you did and fan runs then you have a bad capicator. If fan runs fine in cooling and not in heat then you have a bad board

Jun 01, 2017 | Heating & Cooling

1 Answer

Amana PTAC PTH093E Fan runs at single speed only regardless of setting-auto/low/high Hot or cool air is coming out so compressor/heat coil is working. Reset unit and replaced fan motor-no change.


I've replaced many Amanda control boards. They have micro relays attached to the board. These relays are about a half inch by 1 inch in size, and control line voltage to the compressor and blower motor, and give up quite often. Its probably the board if its a digital controlled board. If it has manual, turn to select, type knob, it will be in that fan section knob. Hope this helps!

Mar 13, 2017 | Amana Heating & Cooling

1 Answer

Fan won't quit running, even after shutting breaker off to entire unit and powering back up.


There is a thermal sensor usually under the top panel that controls the cooling fan. You can check it for continuity or just pull a wire off and power it up. If the fan stops running then this could be the problem. There also could be a stuck relay on the control board. lets hope it is the thermal sensor.

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1 Answer

No heat but fan keeps running


If the air conditioner compressor runs all the time the main control board might be defective. The main control board provides the voltage to the fan motor and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.

Nov 25, 2013 | LG LAN186HV / LAU186HV 18,000 BTU 15 SEER...

1 Answer

This is a heating and cooling through the wall heat pump. It works normally when heating is selected - the heat pump runs and both speeds of the fan blow warm air. But nothing runs when cooling is...


You have a bad board or bad switch. I would say board. You can have service tech check this out. There is only so far you can go without knowledge of Controls ad electricity. Russ

Jul 21, 2009 | Heating & Cooling

2 Answers

Fan runs constantly on cool mode


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

May 18, 2008 | AmcorAire UCHW-H12AF2 Split System Air...

3 Answers

Short cycling


The most common cause is the fan relay on the main circuit board. However, if the outside temperature is 30degF and the inside is 60-65degF then the cause could be the insulation is ruined or missing on the backside of the unit's firewall. This can cause the unit's internal thermocouple wire to read below 45degF which is the freeze sentinal temp level. Anything below this temp level will cause the unit to come on for a few minutes to warm up the air and bring it to 46degF or higher to protect internal plumbing from freezing.
The best way to check for this is to manually set the unit to one of the heat modes and the thermostat up just until the heater comes on. Let it run until the unit turns itself off. Then set the mode switch back to Off and see if the unit still cycles on and off as before.
If it does then the main circuit board should be replaced unless you are comfortable de-soldering and re-soldering another fan relay in place.

Dec 20, 2007 | GE Zoneline AZ38H12DAD Split System Air...

2 Answers

Air Conditioner malfunction


Hi, Sounds like you have a short in the control circuit to me. Turn off all power going to the unit. Write down or otherwise mark the wires leaving the control board going to the thermostat. Remove them from the control board. Replace the fuse. Turn power back on and see if the fan still runs. If it does, check and or replace the heat limit switch that brings the fan on during the heat cycle. It may just need adjusted. If the fuse blows, I would think that the control board is probably bad. If it doesn't blow, Remove the thermostat. Leaving all thermostat wires open check them with an Ohm meter. There should be no continuity between them. Twist all the wires together at one end and ohm them again at the other end. You should have complete continuity on all wires. If the wiring checks out, down power the unit. Double check your wire colors and rewire the control board. With all wires open at the thermostat, turn the power back on. Touch the RED wire to the YELLOW wire. The Condensing unit should come on. Touch the RED wire to the GREEN wire. The fan should come on. Touch the RED wire to the WHITE wire. The heat should come on. Down power the unit. Replace the thermostat. Test unit. If the fuse has lasted ok but blows now it is either wired wrong at the Thermostat or the thermostat is bad. I hope I have helped. NOTE: If you can not understand these instructions. Call a licensed Heating / Air conditioning company. kstfas

Sep 23, 2007 | Heating & Cooling

3 Answers

Ptac fan keeps blowing


Try setting the fan control to "AUTO" this will cause it to cut out with the compressor.

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