Basic megaflo compact. Strange issues, no hw.

[stevetheplumber]

i always wire the overheat stat to break the orange wire from the hot water valve ive seen them wired to break the brown to the valve but ive seen to many valves with the contacts stuck to on even when the valve is closed
if its wired the way i do it that would explain the valve working and boiler not firing

 

[armyash]

Very strange, got there last night and still the same as before.

Ch will come on selected at programmer. Hw nothing.

Can only get hw with ch with valve held open.

So went through it all again, with programmer valve does not move over on hw, so like last time put the new programmer on and turned hw on. Valve now moves over but boiler still won't fire.

Took cover off cyl stat/immersion turned cyl stat up and down. Boiler fired.
Went downstairs made sure ch off at stat and programmer.

Turned hw on and off a few times to make sure it was working all good.

Assume the cylinder stat was playing up and now ok. Not sure why.

Customer didn't want to pay our prices for new programmer so put old one back on and left.

 

[armyash]

Very strange, got there last night and still the same as before.

Ch will come on selected at programmer. Hw nothing.

Can only get hw with ch with valve held open.

So went through it all again, with programmer valve does not move over on hw, so like last time put the new programmer on and turned hw on. Valve now moves over but boiler still won't fire.

Took cover off cyl stat/immersion turned cyl stat up and down. Boiler fired.
Went downstairs made sure ch off at stat and programmer.

Turned hw on and off a few times to make sure it was working all good.

Assume the cylinder stat was playing up and now ok. Not sure why.

Customer didn't want to pay our prices for new programmer so put old one back on and left.