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Had a result thanks to bunnyman and bunny831 swopping thermostat card worked a treat .The only slight prob is it now waits 4-5 min before starts again. Which one of the 3 variable resistor's alters this time?could not find any with plus or minus on didn't want to adjust any now it's...

Thanks the bunny's is the pump mode selector the small white triangular pin?Have removed and cleaned all small bore tubes on boiler.'the throttle on the hydraulic diverter ' is this the pin that moves up and down when DHW called ? If servo valve is not returning correctly after dhw will dhw...

Also what I noticed when looking at boiler previous It was suggested that the time delay on anti cycle can be adjusted on a small POT. but when I had a look this card never had this adjustment POT.on although it had cover screw on main outer casing to suggest a + and - adjustment is this normal?

Thanks bunnyman for your reply have you ever used All Spares Direct where you exchange cards and they repair?They are quoting £30 for this card and a year warranty !Does this sound good value?Tried eebayno look there.

Sorry I meant anti cycling device it delays the boiler firing when the boiler stat switches off&on again,My boiler will only fire up once unless the hot water calls or boiler is switched off and back on again on the big red button.I bought what I thought was correct card but later found out...

Hi Please could some one confirm this is the correct PCB No. 252945 for the thermostat card non hybrid version.There is a time delay fault on boiler so I think this card needs to be changed. Thanks for taking time to read .

Time delay fault .I have the above boiler that gets stuck in the time delay loop can someone give me the PCB number that needs changing please I have the non hybrid thermostat type Thanks Paul

Quick question are the PCB boards common throughout all 5 of the Combicompact VCW Range?Or in particular the one it looks like I need ?Cheers Paul

Was the plug white and it connects in a triangular formation?It was in II then connected to I.The boiler fired up ok when thermstat turned off boiler the pump just ran on let it run for about 3 minutes then switched off on controller.Switched back on and the pump just ran and the boiler...

Just got in after morning Playing with boiler bunnyman you were right diverter valve was a waste of time!!only read your post 2 minutes ago though doh!!Which board? there are 3 I think had them out today to check any loose connection dry joints etc.And when you say connector on 2 is this a...

Nice one I will try the diverter clean first then order this pcb tomorrow Thanks

That makes sense of when I lose power to PCB board using red button any latching relays or timers drop out and boiler starts o.k.!!Is it the top PCB with the couple of relays on it do you remember

what does the anti cycling device do? And do i go plus or minus?

In work have to go and do a bit thanks for your help you have give me something to go on for tomorrow this boiler won't beat me!!!!!!!!

One of the two at the end of the diverter valve ?Sunvic only one left on the shelf at wholesalers!!!

It is the one which can be adjusted mechanically The water valve pin can be adjusted that operates the servo control valve and also at the end of the Diverter vale the microswitch plungers are adjustable Although the movement on this looks nice and smooth!I checked water valve diaphragm...

Does the servo control valve effect the CH system or just DHW ?

I'll give it a go .How does the CH system work (basic) I can see how the DHW signal via water valve (nodding donkey) cam .But can't see where signal from the PCB gets to diverter valve to make micro switches ?Thanks for your help

also put sunvic controller on as old Potterton ep 4000 lcd screen was broken could this make a prob?

Was thinking of taking Diverter off tomorrow to clean ? Is this wise or is it complicated?