Rheem R96VA0702317MSA Error Code 57: High Pressure Switch Open, Inducer on High Speed
What Does Code 57 Mean?
A code 57 on the Rheem R96VA0702317MSA is a critical fault indicating the high pressure switch failed to close when the inducer motor was running at high speed. This fault can occur at any point during the high-fire heat call after the pre-purge and blower-on delays are complete. When the high pressure switch opens during high-fire operation but the low pressure switch remains closed, the IFC will attempt to switch to low-fire heating to try to satisfy the thermostat call rather than shutting down completely. This means the furnace may still provide some heat, but at reduced capacity.
The high pressure switch requires a higher negative pressure to close than the low pressure switch, making it more susceptible to partial venting obstructions. Physical blockages at exterior vent terminations — ice, snow, bird nests, or debris — are the most common cause. Flue vent systems that exceed the maximum length or elbow count for this model, a failing or disconnected inducer motor, disconnected or split pressure switch hoses, or a faulty high pressure switch itself are other causes. High altitude installations may also struggle to generate sufficient negative pressure for the high stage.
Check the exterior vent terminations for visible blockages first. If vents are clear and the problem recurs, a technician must inspect the full venting system and pressure switch circuit.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- If vent terminations are clear and code 57 recurs, call a technician to inspect pressure switch hoses, verify vent run lengths are within specification, and test the inducer motor performance at high speed
- The technician should test the high pressure switch and replace it if it fails to close at the correct negative pressure value; high-altitude installations may require a high-altitude kit
✓ Verified against manufacturer service manual — March 2026