Ruud U802VA050317MSA Error Code A225_F: Internal Fault: Gas Valve 1 Relay Welded Shut
What Does Code A225_F Mean?
Fault code A225_F on the Ruud U802VA indicates that the relay controlling gas valve 1 on the IFC board has welded (fused) shut. This means the relay contacts have been physically fused together by electrical arcing and cannot open regardless of the command signal from the IFC processor. As a result, the gas valve remains continuously energized — the control board cannot turn off gas flow.
The Ruud U802VA documentation identifies this as a critical fault condition. A gas valve that cannot be de-energized will receive a continuous electrical signal, meaning it can continue to open whenever the thermal conditions cause it to actuate, even when no heating cycle has been commanded. This creates a combustion safety hazard.
The welded relay is integral to the IFC board circuit and cannot be repaired individually in the field. The entire control board must be replaced. The manual gas supply valve to the furnace should be closed immediately to prevent any uncontrolled gas flow through the continuously energized valve while awaiting service. After board replacement, the new IFC must be fully programmed via the Bluetooth contractor app.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Welded relay contacts on control board | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Turn off the manual gas supply valve immediately and call a technician — a welded relay is a critical safety fault
- The control board must be replaced; a welded relay cannot be repaired in the field
- After board replacement, a technician must complete the Bluetooth programming and verify the gas valve relay opens and closes correctly
✓ Verified against manufacturer service manual — March 2026