I replaced the limit switch from 50-190 to 70-205, still same problem.

one way to stop the fan is simply dropping the thermostat 1 degree. then the whole system will shut off. but once it calls for heat again, it will fall into the continuous cycle again. any idea? possibly a bad T4?

Hi Renee

It’s likely that the issue you’re facing is related to a faulty thermostat or a wiring problem. When you set the fan to “auto,” it should only come on when the heating or cooling system needs to circulate air.

You’ll need to inspect the wiring of your thermostat and HVAC system for any visible damage or loose connections or reach out to a professional technician to diagnose and repair the problem.

Hope this helps

Daniel

Seems like there’s a wiring issue with your T4 Pro and heat pump unit that needs investigating. Best to turn off the power at the circuit breaker, and trace each wire from the thermostat to the heat pump to make sure they are going to the correct terminals. Also check for any loose connections, or damaged or exposed wires. If nothing obvious, then might be time to call in professional help.

I’d recommend checking if the fan is set to “On” instead of “Auto”. If it’s set to Auto and its set to a reasonable temperature, then there could be a wiring issue that would need to be investigated.

While some thermostat models have a fan that runs continuously to maintain air circulation, the Honeywell thermostat should turn off the fan when your desired temperature is reached (if “Auto” is set).

If the fan keeps running despite the system being off, it might indicate a wiring issue, or the fan setting is set to “On.”

It appears that your Honeywell thermostat’s fan and A/C settings are not functioning properly. To fix this issue, first, ensure that your thermostat is set to “Cool” mode and the fan is set to “Auto.” If the issue persists, you may need to reset the thermostat by carefully removing it from the wall, taking out the batteries for 30 seconds, and then reinstalling it. If these steps don’t resolve the problem, you should consider contacting a professional HVAC technician to diagnose and fix the issue, as it may indicate a problem with the wiring or the cooling system itself.