@Rp1991 , if you are receiving the error code E104, you have a system that is supplying too much voltage that the internal charging circuitry cannot handle. First of all you need to get a Volt Ohm meter and verify the voltage is supplied between the R wire and the C wire. Set your voltmeter to AC voltage and then check the voltage. You should have 24 V AC if you have More than 29 V there’s going to be a problem And that’s when you will get the E104 error.
Can you provide some details about your system, manufacturer, and model number of the air handler and manufacturer model number of the outdoor unit?
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AC Cooling Wizard
NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
