Tuya System Off / Standby Mode Misinterpreted as Fault

Display shows 'OF' or 'OFF', and the thermostat does not call for heating or cooling even when the room is cold/hot.

Possible Causes

System mode set to OFF in settings, schedule set to away/frost protection, external on/off input open (for some Tuya models), misconfigured minimum temperature limit.

How to Fix / Troubleshooting

Safety first: No need to open the thermostat.

Steps to troubleshoot:

Press the mode button to cycle between HEAT/COOL/AUTO/OFF and ensure the correct mode is selected.
Check the schedule in the Tuya app; disable away or vacation mode if active.
Verify any external on/off or window contact input (if your model has it) is closed; bypass it temporarily to test.
Check minimum and maximum setpoint limits in installer settings and adjust them if they prevent normal operation.

Repair Difficulty

Very Easy 1/5