Rheem R802VA07542117MSA Error Code T055_F: Inducer Hi Pressure Switch Won't Open
What Does Code T055_F Mean?
Fault code T055_F on the Rheem R802VA is a troubleshooting-level fault that occurs only on two-stage models. It indicates that the high-stage inducer pressure switch is remaining closed when the IFC expects it to be open. In a two-stage furnace, there are separate pressure switch circuits for low-stage and high-stage operation; the high-stage switch should be open at rest and only close when the inducer is running at high speed and building sufficient draft pressure.
When the high-stage switch is stuck closed before inducer operation begins, the IFC detects an incorrect state and cannot confirm proper switching behavior during startup. This prevents safe transition to high-stage heating.
The T (troubleshooting) prefix means this fault was observed intermittently rather than as an ongoing alarm condition. Possible causes include a mechanical failure in the high-stage pressure switch, a partially blocked sensing hose that traps residual negative pressure, or a defective switch with welded contacts.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- Any time this code appears on a two-stage R802VA — testing and replacing the high-stage pressure switch requires a qualified HVAC technician
- A technician should inspect the high-stage pressure switch sensing hose for blockages or moisture that could keep the switch falsely closed
- If the fault recurs after switch replacement, a technician should verify that the correct replacement switch is installed for this two-stage model
✓ Verified against manufacturer service manual — March 2026