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Yes its a round flat one on top of the combustion chamber.

Really appreciate it, GC 47.311.02

Aftermarket expansion vessels seem to cost less than £20 and replacement part 87161425090 around the £40 mark. Which place would i need to splice in to fit the tee? I assume the pipe running to the pressure relief valve before the existing vessel. Is this correct?

Please can someone provide me with the manual so i can see how easy it is to remove the vessel and also it should give me an idea of how to install another vessel if needed. thanks

Thanks Kev but i havent learnt how to do that yet guidance would be needed to do this.

Hello a friend of mine is getting married on Saturday and the combi has started losing pressure on a daily basis and has been constantly topping up. The overflow seems to drip when the central heating is on. The expansion vessel has no air in it so i put 10psi in it, that has not solved...

I did manage to get a refund as it did not state that i couldnt. The PCB was faulty as i went over so many options and followed all the steps of diagnosis. New board works fine.

Sorry for the confusion everyone, i posted a reply and it kept saying it failed so i kept pressing it. Finally i paid £96+vat for PCB which worked fine. The cheaper board was exactly the same in packaging, part number and style as the expensive one, i was just unlucky. This boiler does...

I went and got replacement pcb from Parts Center as its the last chance before the weekend, cant do with hot water for another 4 days. It cost £96 +vat. i installed it and powered the unit held it on reset for 30 seconds all warning light extinguished and now combi fires up no problems. i have...

I went and got replacement pcb from Parts Center as its the last chance before the weekend, cant do with hot water for another 4 days. It cost £96 +vat. i installed it and powered the unit held it on reset for 30 seconds all warning light extinguished and now combi fires up no problems. i have...

I went and got replacement pcb from Parts Center as its the last chance before the weekend, cant do with hot water for another 4 days. It cost £96 +vat. i installed it and powered the unit held it on reset for 30 seconds all warning light extinguished and now combi fires up no problems. i have...

Got a board from Parts Center for £96 + VAT they have a no-returns policy on PCBs so i had to make sure the one i received from them was completely sealed and not tampered with. installed it and held reset for 3 seconds. No lights. Turned heating on fired up no problems. Turned domestic water...

Got a board from Parts Center for £96 + VAT they have a no-returns policy on PCBs so i had to make sure the one i received from them was completely sealed and not tampered with. installed it and held reset for 3 seconds. No lights. Turned heating on fired up no problems. Turned domestic water...

Got a board from Parts Center for £96 + VAT they have a no-returns policy on PCBs so i had to make sure the one i received from them was completely sealed and not tampered with. installed it and held reset for 3 seconds. No lights. Turned heating on fired up no problems. Turned domestic water...

got new pcb this morning, installed it and held reset as instructed for 3 seconds. this time fan light is off but overheat stat on and flame light on . went and bought new o/h stat still same problem :evil: . phoned potty the said hold reset for 30 secs if light dont distinguish then board...

got new pcb this morning, installed it and held reset as instructed for 3 seconds. this time fan light is off but overheat stat on and flame light on:evil: . went and bought new o/h stat still same problem:evil: . phoned potty the said hold reset for 30 secs if light dont distinguish then board...

Thanks for all the comments. I have ordered a new PCB for £80 inc vat and postage i should receive it on Thursday and will post the outcome.

what does it look like please? size, colour? thanks

There was no red button i looked everywhere the manual does not mention it either. I have seen this button on other boilers but not on this one. I tested the overheat thermo and it has continuity at 8 degrees with a resistance of about 0.05 ohms, is this right???? . there is a reset...

Thanks everyone for the quick responces. When i looked the pressure had dropped by 0.5 bar so i filled it up again. I will try and check what has overheated and let you all know the outcome.