MEDIUM URGENCY

Rheem Code 57 - Pressure Switch Calibration

Code 57

Pressure switch calibration fault.

Brand: Rheem (Also covers Ruud) | Equipment: Gas Furnace

What This Code Means

Code 57 on Rheem (Ruud) means the pressure switch is operating outside its expected calibration range. Switch or tubing issue.

Common

What: Water or kinks in tubing affect readings.

How to check: Inspect rubber/plastic tubing.

Fix: Clear or replace tubing.

Common

What: Switch is degrading and reading inconsistently.

How to check: Tech manometer test.

Fix: Replace switch.

Shop parts

Difference between Rheem code 55 and 57?

55 is a clear pressure switch fault; 57 is a calibration drift - switch reads but values are off.

Same on Ruud?

Yes.

DIY?

Tubing inspection yes; switch replacement straightforward.