Honeywell Gas Valve Error Codes: What They Mean and How to Fix Them

In all types of boilers, including natural gas and pressurized water types, there are a variety of safety features to prevent unsafe conditions, as well as manual and automatic controls to monitor operating status. These devices alert operators to potential issues so the problems can be addressed before they become hazardous situations. Let’s take a look at some common Honeywell gas valve error codes and what you should do if you encounter them. If you smell gas or see an indicator light, always leave the area immediately and call the emergency services from a safe distance. Never turn your gas back on or attempt any repairs until after authorities have inspected the area for hazards and approved it for re-entry.

Error code 21: Temperature Sensor Error

An error code 21 on the Honeywell gas valve signifies a problem with the temperature sensor. There are two temperature sensors on a typical gas valve: one on the gas valve itself and one on the gas burner. Ideally, the temperatures detected by both sensors should match within a few degrees. If one of the sensors detects a significantly different temperature than the other one, an error code 21 may occur. Check to make sure nothing is blocking the sensors and if so, remove it and try again. If the sensors are clear and the values are still not matching, it may be time to replace the gas valve.

Error code 22: Shifting Solenoid Valve (SSV) Error

If you receive an error code 22 on your Honeywell gas valve, the solenoid valve is stuck in one position. This could be due to a clogged or jammed valve, a broken wire, or a broken solenoid coil. To fix the issue, first, check the wire connections to the valve. If they are loose, tighten them as much as possible. If they are loose and you cannot tighten them enough, replace the wiring altogether. If tightening the wires doesn’t solve the issue, remove the solenoid valve and clean it thoroughly. If you still receive the error code after completing these steps, it may be time to replace the gas valve.

Error code 23: Rotary Solenoid Valve (RSV) Error

An RSV error code on a Honeywell gas valve indicates a problem with the solenoid coil. To resolve this issue, first, check the wiring connections from the control board to the solenoid coil. If the connections are loose, tighten them as much as possible. If the connections are loose and you cannot tighten them enough, replace the wiring altogether. Next, remove the solenoid valve and clean it thoroughly. If you still receive an error code after completing these steps, it may be time to replace the gas valve.

Error code 24: Humidifier Bypass Preset Position

A Honeywell gas valve error code 24 indicates that the humidifier bypasses the preset position and is active. This means the humidifier bypass feature has been activated. If you are using this feature, it is likely because your boiler does not have enough water flow for the humidifier to function properly. However, you should be aware that using this bypass may result in boiler overheating, which is unsafe and illegal. To disable the bypass preset position, contact your service provider for assistance. To reactivate the humidifier bypass, turn the Honeywell gas valve off and then back on again.

Error code 25: Humidifier Bypass Cause Unknown

A fault code 25 on a Honeywell gas valve means that the humidifier bypass was activated, but the cause is unknown. This issue can be caused by a clogged or otherwise restricted water line, a clogged humidifier, or an insufficient flow of water to the humidifier. To resolve the issue, take a look at your boiler and humidifier to ensure nothing is blocking the flow of water. Additionally, clean or replace your humidifier as needed. If these steps don’t solve the issue, it may be time to replace your gas valve.

Error Code 26: Burner Orifice Limitation Fault

A burner orifice limitation fault on a Honeywell gas valve means the gas burner is unable to open due to the orifice being clogged. To correct this issue, first, unplug your boiler and make sure nothing is blocking the burner orifice. If nothing is present, remove the burner and clean the orifice. If the orifice is still clogged after cleaning, it may be time to replace your gas valve.

Conclusion

A gas appliance is quite an investment, so when you have one installed in your home, it’s important to understand the risks of operating it. While gas may seem like a very safe and straightforward fuel to use, it’s important to remember that all appliances have the potential to malfunction and cause problems. Therefore, it’s important to make sure you’re familiar with the warning signs of common gas valve error codes so you can address the issue promptly.