I'm well aware of which is which in terms of the two diaphrams
DHW diaphram is the larger one with a pushrod attached. The main flow switch diaphram is much smaller and mounted on the three-way valve.
Trouble is that I'm not sure what the main flow switch diaphram & microswitch is doing. I know that its going into the PCB, and that if I remove it the boiler gives a no gas light. I don't know why though- As I understand it, the microswitch should either be operated or not. When its not operated, it ought to be exactly the same state as unplugged.
FWIW, the manuals (Got the service manual, installation manual & user manual) are a waste of space, not even mentioning diaphrams
No, I'm not a boiler engineer, but equally this thing doesn't appear to act through any reasonable laws of logic
-Leezer-
DHW diaphram is the larger one with a pushrod attached. The main flow switch diaphram is much smaller and mounted on the three-way valve.
Trouble is that I'm not sure what the main flow switch diaphram & microswitch is doing. I know that its going into the PCB, and that if I remove it the boiler gives a no gas light. I don't know why though- As I understand it, the microswitch should either be operated or not. When its not operated, it ought to be exactly the same state as unplugged.
FWIW, the manuals (Got the service manual, installation manual & user manual) are a waste of space, not even mentioning diaphrams
No, I'm not a boiler engineer, but equally this thing doesn't appear to act through any reasonable laws of logic
-Leezer-