Ruud U802VA050317MSA Error Code A226_F: Internal Fault: Gas Valve 1 Relay Stuck Open
What Does Code A226_F Mean?
A226_F on the Ruud U802VA means the Bluetooth Communicating IFC has detected that the relay controlling gas valve 1 (the primary valve) is stuck open — its contacts will not close. Because the relay cannot close, the control cannot send voltage to the gas valve, so the valve never opens and no gas reaches the burners.
Unlike A225_F (Gas Valve 1 Relay Welded Shut), this failure mode is not an uncontrolled-gas hazard: the valve simply can never be energized, so there is no risk of gas flowing when it shouldn't. The consequence is instead a complete no-heat condition — the furnace runs its start sequence but cannot light. A226_F and A225_F are the two opposite failure modes of the same primary gas-valve relay. On two-stage units, the high-stage valve has its own stuck-open code, A228_F.
The relay is integral to the IFC, so the board is replaced rather than repaired. A technician installs a new IFC and programs it over Bluetooth with the model and blower data from the furnace's QR code, then verifies the gas-valve relay energizes correctly on a heat call.
What You'll Notice
- The furnace goes through its start sequence but the burners never light.
- There is no heat despite the thermostat calling.
- The contractor app shows A226_F as an internal fault.
- You do not smell gas — the valve is simply never opened.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Failed relay contacts on control board | Most common | ✗ Call a pro → |
How This Is Diagnosed
A technician confirms A226_F in the Ruud contractor app and recognizes it as the stuck-open (no-energize) failure of the primary gas-valve relay rather than the welded-shut hazard. They verify the control is commanding the valve during a heat call but no voltage reaches it because the relay will not close; since the relay is part of the board, they replace the IFC and program the new board over Bluetooth for the model.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The furnace runs its start-up but never lights and the app shows A226_F
- There is no heat even though the igniter and inducer may cycle
- The internal fault does not clear after power is cycled
- The control board needs replacement and Bluetooth programming
Frequently Asked Questions
Is A226_F a gas leak risk?
No. This relay is stuck open, so the gas valve can never be energized. There is no uncontrolled gas flow — the problem is that the furnace cannot heat.
Why won't my furnace light with A226_F?
The control cannot send power to the gas valve because the relay won't close, so no gas reaches the burners even though the rest of the start sequence runs.
Can the relay be replaced by itself?
No. It is integral to the IFC. A technician replaces the whole control board and programs the new one for your furnace model.
✓ Verified against manufacturer service manual — March 2026