What does it mean if my thermostat reads “output fault detected” on the display?
Output fault detected can mean many things. The best thing to do would be to follow the instructions on the unit and call Warmup.
It is likely to be a wiring or installation issue. Please consult our installation manual for further assistance. Complete Troubleshooting steps with a licensed electrician. Please have the electrician call us on site with the model numbers that were installed and a multimeter for testing.