Error Code h01 56: Pressure Switch Stuck Open. With the flue fan on, the combustion chamber pressure switch is detected as opened after the flue fan time has expired indicating that the switch is stuck open.
Brivis Error Code 56 Fault: Pressure Switch Stuck Open: With the flue fan on, the combustion chamber pressure switch is detected as opened after the flue fan time has expired indicating that the switch is stuck open.
For Heater Repair Tech Only
Reason With the combustion fan forced on the combustion chamber pressure switch is detected as open after the combustion fan delay time of 15 Seconds has expired indicating that the switch is “stuck off” and did not close when it should. On SP 6 models, this could be caused by either pressure switch not closing. This may be caused be insufficient vacuum pressure to close the pressure switch (Note: on SP 6 models, both switches must close to prevent this error). Service Check List Vacuum Pressure Checking Procedure (All pressure switches) Measure vacuum pressure at each pressure switch during pre-purge (or force an overheat condition, by breaking the overheat switch circuit, to operate the combustion fan). Perform these pressure checks without the pressure switch connected to the pressure hose. If vacuum pressure is above specification (All pressure switches) If the vacuum pressure is above the pressure switch’s specified value and Error 56 still occurs, then the pressure switch may be faulty and should be replaced. If vacuum pressure is below specification (All pressure switches) Vacuum pressure hoses are not fitted correctly – check hose connections (for SP 6 models, also check that the hoses are connected to the correct pressure switch). Vacuum pressure hoses have perished and cracked causing vacuum pressure loss – check for deterioration. Water trapped in the vacuum pressure hose – check for water traps or presence of moisture in hoses. Make sure there is no water in the hose when servicing the system. Excessive heat exchanger leakage resulting in vacuum pressure loss – check heat exchanger for leakage. Combustion fan may be faulty – check according to procedure in section (Combustion Fan) If vacuum pressure is below specification (Combustion fan box pressure switch) Flue piping is too restrictive – check against allowable flue pipe configuration specification including the flue cowl. Flue pipe has collected excessive condensate – check for potential collection points (there must be a continual fall back to the heater – 20mm rise per Metre). If vacuum pressure is below specification (Condensate tank pressure switch – SP 6 models only) Condensate tank is not draining properly – check drain, check for gurgle noise coming from SP 6 inlet ports.