Error code



The overload protection of the product is activated, or the internal temperature of the product is too high.


Make sure that the electrical load connected to the thermostat is equal to or less than its technical limitation.

Line voltage thermostat

Maximum load @ 120 VAC

Maximum load @ 240 VAC

TH1120RF-30001500 W

3000 W

TH1120RF-40002000 W

4000 W

TH1121RF-30001500 W

3000 W

TH1121RF-40002000 W

4000 W

TH1123ZB1500 W

3000 W

TH1124ZB2000 W

4000 W

TH1123WF1500 W

3000 W

TH1124WF2000 W

4000 W

TH1500RF1800 W

3600 W

TH1500ZB1800 W

3600 W

Check that no external source influences the temperature of the thermostat.


Perform a reset of the circuit breaker.

  1. Find the circuit breaker connected to the unit.
  2. Disable it.
  3. Wait about 30 seconds.
  4. Reactivate the circuit breaker.

Problem solved?

  • Yes
  • No