Observe colored 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 | Service Procedure |
| None (LED not on or flashing) | Millivolt power is not present. Light pilot. | Gas valve is functioning
normally. Gas valve is not powered. Light pilot. |
If the pilot will not stay lit replace pilot assembly. If problem persists, replace gas control. |
| One flash every four seconds
(LED green) |
Not an error. Indicates pilot is lit and main burner is off. | The knob can be turned to a desired setpoint temperature. | Normal operation. |
| One flash every second
(LED green) |
Not an error. Indicates main valve is open and main burner is lit. | None. Control will automatically shut main burner off when water temperature reaches the setpoint temperature. | Normal operation. |
| Two flashes and three second
pause (LED yellow) |
Low thermopile voltage; main valve not turned on. | Check thermopile and its
connections. Check pilot flame. |
1. See Service Procedure IV 2. See Service Procedure II 3. See Service Procedure II |
| Four flashes and three second
pause (LED red) |
Temperature cut-out limit reached, causing shutdown. | Check the valves and the water temperature sensor. Reduce the water temperature setpoint. Verify control operation, replace if exceeding setpoint. | Replace gas control. |
| Five flashes and three second
pause (LED red) |
Electronics, sensor, or gas valve fault detected. | Check water temperature sensor and its connection for open circuits, shorts, or differences in resistance between the two sensor elements. | Replace gas control. |
| Solid ON
(LED red) |
Not an error–indicates that the control is in OFF position. | None; wait until LED turns off if you want to restart system. | LED will go out and the control will function normally once the pilot is lit. |
