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Error code reference

Honeywell Water Heater Error Code Status Light On (solid)

Pilot light was recently extinguished and the thermopile is cooling down.

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Pilot light was recently extinguished and the thermopile is cooling down.

First step from the service manual

Turn the gas control valve/thermostat knob to OFF. Wait 10 minutes for the thermopile to cool, then attempt to relight the pilot.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Status Light On (solid) means on a Honeywell water heater

The solid status light on a Honeywell gas water heater indicates that the pilot flame has been recently extinguished and the thermopile is still in the process of cooling down. The thermopile is a thermoelectric device made up of multiple thermocouples connected in series. It generates a small DC voltage, typically in the range of 300 to 750 millivolts, when heated by the pilot flame. This voltage powers the gas valve's electronic controls and safety circuits. When the pilot goes out, the thermopile retains residual heat and continues to produce a reduced voltage as it cools.

During this cooling period, the gas control valve's internal logic detects that the thermopile is outputting voltage but the pilot is no longer sustaining normal operation. The solid light is the valve's way of signaling this transitional state. Attempting to relight the pilot before the thermopile has fully cooled can interfere with the ignition sequence because the residual voltage may affect the control circuit's ability to properly register a new pilot flame being established.

The correct response is to turn the gas control knob to the OFF position and wait approximately 10 minutes for the thermopile to cool completely. Once cooled, the thermopile output drops to near zero, allowing the control valve to reset to a neutral state. At that point, the standard pilot lighting procedure can be followed. If the pilot continues to go out repeatedly after successful relighting, further diagnosis of the thermopile output voltage, pilot flame condition, and gas supply pressure would be warranted.

Source: manufacturer service documentation.

Common causes of Status Light On (solid)

  1. 01

    Pilot flame blown out by draft

    Wiring / connection

    A sudden draft from a nearby door, window, or HVAC system can extinguish the pilot flame. Check the area around the water heater for air movement sources before relighting.

  2. 02

    Thermopile not fully heated before releasing pilot button

    Wiring / connection

    If the pilot button was not held long enough during the last lighting attempt, the thermopile never reached sufficient operating temperature to keep the gas valve open. The pilot then went out when the button was released.

  3. 03

    Weak or degraded thermopile

    Part replacement

    A thermopile that is aging or failing may generate insufficient voltage to maintain the gas valve in the open position, causing the pilot to extinguish shortly after lighting. Output below approximately 300 millivolts under load is a sign of a failing thermopile.

  4. 04

    Debris or contamination on pilot orifice

    Wiring / connection

    Dust, rust particles, or other debris can partially block the pilot orifice, reducing flame size so the thermopile does not heat adequately. The pilot may appear lit but produces a weak or unstable flame.

  5. 05

    Low gas supply pressure

    Wiring / connection

    Insufficient gas pressure to the water heater can cause a marginal pilot flame that fails to sustain itself. This may occur if multiple gas appliances are running simultaneously or if there is an issue with the supply line or regulator.

See the test procedure for each cause

Frequently asked questions about Status Light On (solid)

What does Status Light On (solid) mean on a Honeywell water_heater?
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.
How do I fix a solid status light on my Honeywell water heater?
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.
Is a solid status light on a Honeywell water heater a safety concern?
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.
Will resetting the Honeywell water heater clear the solid status light?
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.
How much does it cost to repair a Honeywell water heater that keeps losing the pilot light?
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.

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