If you see 'E3' or 'E0' as an error code, it means that there is a fault with one of the sensors on a thermostat. It would need to be either repair or replaced if it is out of warranty.
If you see 'E3' or 'E0' as an error code, it means that there is a fault with one of the sensors on a thermostat. It would need to be either repair or replaced if it is out of warranty.