Brivis Error Code 57 Pressure Switch Stuck Closed: With the flue fan off, the combustion chamber pressure switch is detected as closed indicating that the switch is stuck closed.
For Heater Repair Tech Only
Reason: With the combustion fan forced off, the pressure switch is detected as closed indicating that the switch is “stuck on” and is not open when it should be. This error will occur prior to pre-purge when the NG-2 control checks to ensure that the pressure switch/switches are open before operating the combustion fan. Service Check List: Vacuum Pressure Checking Procedure Measure vacuum pressure at each pressure switch without any combustion fan operation. If vacuum pressure is below the pressure switch closing specification (All pressure switches) If the vacuum pressure is below the pressure switch’s specified closing value and Error 57 still occurs, then the pressure switch may be faulty – check the switch for continuity and if it is closed with low vacuum pressure (below specification, or no pressure at all) then it should be replaced.