Brivis Error Code 48 Pressure Lost: During a heating cycle the combustion chamber pressure switch has opened indicating a pressure loss with the maximum times this is allowed not exceeded.
For Heater Repair Tech Only
Reason: During the “ON” phase of the heating cycle after the “FLUEDELAY” state has been processed the pressure switch has opened, indicating a pressure. The heating cycle will be forced to its “OFF” state and a restart initiated. If this occurs for 5 consecutive times, the Error 58 – Pressure Fail will occur and a manual reset will be required. Service Check List: Vacuum Pressure Checking Procedure Measure vacuum pressure at each pressure switch during normal operation. Monitor the vacuum pressure overtime, as it may fall to a level close to the vacuum pressure that will cause the switch to become open circuit. If vacuum pressure is above specification (All pressure switches) If the vacuum pressure is above the pressure switch’s specified value and Error 48 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. 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. Excessive heat exchanger leakage resulting in vacuum pressure loss – check heat exchanger for leakage. If vacuum pressure is below specification (Combustion fan box pressure switch) Flue piping is too restrictive – check against allowable flue pipe configuration specification. Flue pipe has collected excessive condensate – check for potential collection points (there must be a continual fall back to the heater). 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. Intermittent failures It is possible that under sever wind conditions that excessive back pressure may cause this error to be logged, particularly on external models). It may also be the result of a blocked condensate drain, but may not be present at the time of servicing due to evaporation within the condensate drain line.