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This is normally caused by a sticking relay or defective fan control board in the unit.If you can provide model on unit and if you have a volt meter for troubleshooting I will be happy to assist you in determining the cause.
Depending on model on unit if fan is controlled by a control board with relays built onto board or if replaceable relay.Follow the fan wires to see where they get power. Whether from relay or board, or a sequencer, disconnect the control wire that signals relay to close and verify we are still getting power through to motor.
To tell you exactly, I need model on unit as every unit works slightly different and uses different controls.
I a here most everyday, so you can leave the question open and come back here if you have internet access and I will be happy to guide you. step by step.
We can send responses back and forth here on the website, Also if interested we can talk on phone for an additional service fee of 18.00 if interested.I will present offer and if interested accept.If not we work here until finished.
I own and operate a heating and ac company so not sure exactly when I have to leave to assist in the field on weekdays. I am here most of the day today and will be in and out tomorrow.
Absolutely.I will keep check on the question
OK if fan went off when you disconnect thermostat wire, the issue is in thermostat.You do have it set to AUTO and not ON correct?
Ok with fan in ON position it is normal for the fan to run nonstop. It will only cycle with the heat pump when in AUTO position.
Turn the FAN selector to AUTO and see if it cycles with heat pump
Fan should run about 1 minute and a half to 2 minutes after heat pump shuts down, Is it running longer than tat?
So now you are saying that you are in heat mode, and outdoor unit as well as fan are running but bowing cool?
Ok so both indoor and outdoor stayed running blowing cold air in heat mode for 15 minutes?
What is model on thermostat? Aux heat should not come on when thermostat s satisfied.
Looking for a manual. The only time aux should come on is if outdoor is in defrost or heat pump needs backup assistance to keep up.
That is correct.AUX should not be coming on after thermostat temp is satisfied.
I would say defective thermostat. The only time aux should ever come is is :
1.requested temp is at least 5 degrees higher than room temp
2.Heat pump is in defrost mode
3.Emer heat is called for
OK my impression when I read the question "My heat pump heats up to set temp but fan stays on", was that unit is heating properly to room temp, but the fan kept running blowing cold.
If you are not getting warm air when outdoor unit is running but no aux, we have an issue with the heat pump.
Please verify as this is 2 complete different scenarios.
OK do this for me. Turn thermostat to call for heat and feel of the large copper refrigerant line between the heat pump and indoor coil and tell me if the large copper pipe is hot to touch.
Ok now is outdoor unit running and can you verify that the compressor is actually on ,not just fan in outdoor unit? (Usuallay you can hear the deeper sound of compressor)
If outdoor fan is running, but the pipe (large copper line) is not hot, either the compressor is not on or we have a refrigerant issue. Do you happen to have refrigerant gauges?
Sorry was on phone with a customer.Do you have gauges or can you determine if compressor is running?If outdoor fan is running, but the pipe (large copper line) is not hot, either the compressor is not on or we have a refrigerant issue. Do you happen to have refrigerant gauges?
Sounds good. lets get those gauges connected and see what is happening.
Turn thermostat to HEAT mode and connect red hose to large service port and blue hose to small service port .Turn unit on and tell me pressures on each gauge.
Yes .Will be leaving for dinner in a while but won't be gone long. Are you able to hook up gauges as shown above?
Connect the blue low side gauge to the small service valve in heat mode and red high side to large service port.
Can you attach photo of gauges and how connected? As is system on or off?
If you have a paper clip icon on your page you can attach using that link.Or
You can upload the pictures using the tiny pic site .
Here is a link to the site.
Click on Browse , select the file from your folder.then click UPLOAD NOW.
They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW
You will see your picture on right side of screen.
Then copy the link URL for email & IM
Paste that link here on the site.
I am going to open this to other experts who may be able to assist better.I have opted out of the question to see if perhaps other experts may have more information and can assist.Please do not rate or reply as that will send question back to my desk and delay getting assistance..Please stand by to see if another expert can assist further.