Honeywell Water Heater Troubleshooting

Do you have problems with your Honeywell water heater? Quickly diagnose and repair your water heater with our comprehensive troubleshooting guide. The chances are a bad thermocouple has shut off the gas to the pilot light or an issue with the pilot light. This article will show you how to fix Honeywell electric and gas heater.  

Honeywell Water Heater Troubleshooting

You can observe a green LED indicator on the water heater gas control when your Honeywell water heater not working. The error codes on the LED status will indicate the issue by reporting a number of flashes.

l O flashes - Control off or Pilot out

l 1 flash - Normal operation

l 2 flashes - Thermopile voltage is low

l 4 flashes - Temperature exceeded

l 5 flashes - Sensor failure

l 7 flashes - Gas control valve failure

l 8 flashes - Power off failure

The thermopile generates electricity in the Honeywell water heater that is needed to power the gas control valve. It will take up to 90 seconds to get hot enough to power the gas control valve once the pilot is lit. When it happens, the status light will blink once every 3 seconds which indicates normal operation. If the light blinks more than once every three seconds, you need to refer to the status light code list or label on the gas control valve.

Try lighting the pilot by following the lighting instructions given in the manual or on the heater and visually confirm the pilot can be lit. Next, set the gas control knob to "Pilot". Hold the control knob in while clicking the igniter button and looking through the inside water heater to the left. In order to see the pilot, you may have to dim the room lights.

If there is air in the gas line, it may take up to 90 seconds before the pilot lights and the status light begins to blink. Even after 90 seconds also, if the status light won't start blink, you have to release the control knob and turn off the gas valve.

You should wait ten minutes before attempting to relight the pilot. On newly installed water heaters, it may take 2 to 3 lighting attempts before the pilot lights and status light starts blinking.

Two flashes and three-second pause - Weak pilot signal is detected.

The system will reset when the pilot flame is sufficient. Thermopile failure, unstable pilot, blocked/ restricted pilot tube, or opened resettable thermal switch might be caused this problem. You can check the troubleshooting tips in the service manual.

Three flashes and three-second pause - Insufficient water heating.

The temperature sensor could be out of calibration. Check and recalibrate it.

Four flashes and three-second pause - Excessive tank temperature.

Check for faulty gas control and verify if the temperature sensor is out of calibration.

Final Words

We hope our guide on Honeywell water heater status light codes and Honeywell water heater troubleshooting was helpful and it was able to get back your unit running. When you need to go through Honeywell water heater thermostat replacement or controller replacement, it's better to call a professional. Still, if your Honeywell water heater not working, refer to the manual and fix the issue.