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Discuss Biasi M90E no DHW or CH in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Hi Guys, called out to a Biasi M90 with no DHW or CH. ignition pcb was faulty but since realised that there is no live to that board. I have a live feed into the main board and fuse is good. Do we reckon it’s the main pcb that’s at fault?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Overheat stat fine ?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Pump running when demand or just totally dead?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
No voltage to fan ?

Check the pump proving circuit
 

garygvl

Gas Engineer
Advent Win
as shaun said is spindle coming out on pump proving and operating the microswitch assembly on the left hand side of the boiler. if you take microswitch off its housing by removing the spring clip then turn on so pump running then push a small screwdriver into the hole to operate the m/switch and boiler fires up you need to change the diaphragm on pump proving assembly
 
OP
PDS

PDS

I have just checked this and all is working fine. Spindle is free and diaphragm operates correctly.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Pcb then I would say
 

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