The above boiler (manufactured by Johnson and Stanley)
Is showing error codes 37 and 40.
It tries to fire up intermittently, the system pressure on gauge is 1.2bar, when error code 37 appears, the LCD screen shows pressure decreasing to zero, but gauge is still steady at 1.2 bar.
When error code 40 is displayed, the LCD screen shows pressure at 6.5 bar, gauge is still at 1.2 bar.
No DHW and no CH, a symbol with radiator striked-through also appears.
The pressure at the gauge has increased over the last couple of days to 2.6 bar.
Also when switching, either at panel or at FCU, the RCD at CU will trip when re-energising the boiler.
What could be the issue/issues?
Is showing error codes 37 and 40.
It tries to fire up intermittently, the system pressure on gauge is 1.2bar, when error code 37 appears, the LCD screen shows pressure decreasing to zero, but gauge is still steady at 1.2 bar.
When error code 40 is displayed, the LCD screen shows pressure at 6.5 bar, gauge is still at 1.2 bar.
No DHW and no CH, a symbol with radiator striked-through also appears.
The pressure at the gauge has increased over the last couple of days to 2.6 bar.
Also when switching, either at panel or at FCU, the RCD at CU will trip when re-energising the boiler.
What could be the issue/issues?
