Observe green LED indicator on gas control. Status flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the troubleshooting table below.
| LED Status | Control Status | Probable Cause |
| None (LED not on or flashing) | Indicates control is off. Main and pilot burner are off. | Gas valve is functioning normally. Gas valve is not powered. Light pilot. |
| One flash every four seconds | Not an error. Indicates pilot is lit and main burner is off. | Gas valve is powered and waiting for the set point knob to be turned to a water temperature setting. If the set point knob is at desired setting, the thermostat is satisfied. |
| One flash every second | Not an error. Indicates main valve is open and main
burner is lit. |
Thermostat is calling for heat. Water heater operating normally and is in heat cycle. |
| Solid ON | Not an error. Indicates that the control is in shutdown mode. | Set point knob was recently turned to “OFF” position. Wait until LED goes out before attempting to relight. |
| Two flashes and three second
pause |
Low thermopile voltage; main burner not lit. | Loose thermopile connections or weak pilot flame. |
| Four flashes and three second
pause |
Temperature cut-out limit reached causing shutdown. | Excessive temperatures may have been reached. Shut off the control and reduce the water temperature. Thoroughly verify control operation, replace if exceeding setpoint. |
| Five flashes and three second
pause |
Electronics, sensor, or gas valve fault detected. | Control may be wet or damaged. Verify all connections are tight; if problem persists replace the control. |
