Faulty baxi duotec 33 he a

[Phil moore]

hi any body come accross this fault

Hot water works correctly , no central heating , diverted valve working , if thermostat is wired out and wire bridgd for switch , the central heating will work every time the boiler is powered down and back up , soon as the switch wire opens , the central heating switches off and won’t come back on until the boile that’s been powered down the turned back on with the switch wire in place
I’ve fitted a new pcb and same symptoms
Any help would be much appreciated
Cheers
Phil

 

[CBW]

Where are you bridging it out? Thermostat end or boiler end? Could be the thermostat that’s faulty

 

[Phil moore]

Wired thermostat out , so it’s something in the boiler

 

[ianmcd]

soon as the switch wire opens

How does the switch wire open, do you mean you remove the link ?

 

[Phil moore]

Yes , which is manually replicating the thermostat switch operation

 

[GasElectricalRepairs]

I would do it from cold and adjust the heating temp from min to max as you take out and replace the link . Could be the pot for the heating temp.

 

[ianmcd]

Yes , which is manually replicating the thermostat switch operation

Am I missing something, of course it wont work if you remove the link and if it works when you make the link again then its the room stat that is faulty

 

[Phil moore]

Ian - The boiler doesn’t work when the link is reinstated ( affectively what the thermostat does) so the boiler has to be switched off , link reinstated, then boiler switched on for the central heating to work if at any point the link opens , the boiler switches off (correct operation) but then when the link closes the boiler doesn’t switch back on like it should

 

[Phil moore]

GLR - pot from heating temp ? What’s that