Honeywell Water Heater Error Code Status Light On (solid)

A solid status light on a Honeywell water heater means the pilot flame was recently extinguished and the thermopile is still cooling down. The thermopile is a component that generates voltage from heat to power the gas control valve. During this cooldown phase, the valve is in a transitional state and is not ready for a new pilot lighting attempt. This is a normal condition that resolves on its own within about 10 minutes.

The solid status light itself is not a safety emergency. It simply indicates the system is in a cooldown state after the pilot went out. However, you should not attempt to relight the pilot until the 10-minute wait period has passed, as doing so prematurely can interfere with the ignition sequence. If you smell gas at any point, leave the area and contact your gas utility immediately.

If the issue is a failing thermopile, replacement parts typically cost in the range of $15 to $50 depending on the specific component. Professional labor to diagnose and replace a thermopile generally adds $75 to $200 to the total. If the gas control valve itself is at fault, replacement costs are higher, often ranging from $100 to $300 for the part alone, plus labor.

Turn the gas control valve knob to the OFF position and wait at least 10 minutes for the thermopile to cool completely. After that time, follow the pilot lighting instructions printed on the water heater label. If the pilot lights but goes out again shortly after, the thermopile or pilot assembly may need further inspection or replacement.

The solid light will clear on its own once the thermopile has cooled to a low enough temperature, which typically takes around 10 minutes. Turning the gas control knob to OFF is part of the recommended procedure and helps ensure the control valve is in a safe state during the cooldown. There is no separate reset button required for this condition.