Rheem R96V fault 57: pressure switch open at the wrong time

What Does Error 57 Mean?

Rheem R96V fault 57 means the combustion pressure switch is open when the control expects it closed. The furnace can withhold gas heat while other modes remain available. The code does not prove a defective switch because draft, venting, condensate, tubing, inducer, wiring, and actual pressure determine its state. Applies to: R96V communicating condensing gas furnaces This definition applies to R96V furnaces covered by Rheem document 92-24161-184. Other Rheem control generations and water-heating products can assign 57 differently, so use the full furnace model. Owner-safe checks: With panels intact, capture code 57, thermostat demand, inducer sound, time to fault, and safe exterior photos of the vent termination. Qualified technician: Draft measurement, vent and condensate access, inducer testing, tubing inspection, switch verification, wiring, and combustion work require licensed furnace service.