What It Means
High pressure switch closed while inducer motor is off.
Rheem Furnace
Rheem Furnace Error Code 55
Troubleshooting guide for the Rheem Furnace system fault 55.
Possible Causes
- High pressure switch stuck closed.
- Switch bypassed or miswired.
- Abnormal negative draft in vent system.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
High pressure switch closed while inducer is off.
All Recorded Causes
High pressure switch stuck closed, pressure switch bypassed, loose or faulty wiring, or abnormal negative pressure in the vent system while the inducer is not running.
Verify Before Replacing Parts
- Confirm the exact Rheem model family and furnaces context before acting on a generic code description.
- Walk the entire heating sequence in order instead of jumping straight to the reported code, watching for high pressure switch stuck closed, pressure switch bypassed, loose or faulty wiring, or ab….
- Verify each safety device and prove where the sequence stops under live operation, including whether the next candidate on the list.
- After the correction, run the system long enough to confirm the furnaces fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Rheem Furnace diagnostics step-by-step — so you confirm the cause before swapping parts.
