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Today i fitted a pcb and an diverter vavle to a optimax he 38 c when i come to switch it on and fire it up f37 is on the display. f37 is system pressure to low but it was at 1.5 bar any suggestions anyone

Im a gas engineer and would like some advice.i was called to a couple of flowmatics with problems.The first one is when you try the HW it will come on but then try it again and it wont it seems to come on when it feels like.The pins on both manifolds come out enough to press the microswitch.The...