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Thanks again Ian for the link to the boiler manual - I checked the fault history and there is one F.22 and nine F.28 codes in the history - according to the manual there could be a number of causes for the codes, is there a way to narrow down the cause ? Also in the indication column for fault...

Thanks for the quick response Ian - can you please guide me how to check the fault history to see if there's anything there ? I have not seen any 'F' codes on the display since the problem first started occurring - will there be anything in the fault history if no 'F' codes have been displayed...

I am hoping someone here can help - have looked through this very helpful forum and couldn't find a similar issue discussed. I have a Vaillant Turbomax plus 828E which works intermittently for both hot water and heating - it comes on sometimes and at other times it doesn't. From what I can tell...

'premature boiler failure' - could you please clarify ?

Water is hot, maybe not scalding hot.

So here are the pics, can't see any differences from previous pics myself although I have no idea where I should be looking, maybe your trained eyes can spot something...at the moment I am inclined to believe that my boiler engineer has not mugged me unless you guys can show me otherwise.

Aquaheat - not sure how you came to the conclusion that I wouldn't listen, I came on here to 'hear' expert opinions and took the advice about jumper settings to my boiler engineer so don't know what you are talking about !

not fibbing or telling porkies - I have no reason to do so. Will take photos again and compare against previous photos to see if I can spot any differences, will know soon enough if I have been mugged. I didn't see him open the cover that sits on top of the PCB if he did sneakily change the...

Tony, can you point me to the FAQ you mentioned - can't seem to find it.

It's all working for now. Been told I should get the system flushed otherwise diverter could fail again or some other part may fail. I believe the PCB was faulty, boiler simply wouldn't fire(f29 followed by f28) until it was replaced - it is a repaired PCB board as you alluded, charged me £90...

Just an update -it turns out the diverter valve needed changing. Boiler engineer did not change any jumper settings on the PCB.

Thanks Jon, appreciate your input.

Typical, can't get hold of engineer - can anybody at-least point out where on the PCB the jumpers are/should be ? One other thing, the boiler keeps making this sound, something like trrrrr, trrrrr, trrrr, roughly 3 times. Noticed it happens right after the hot water tap has been switched off or...

Anybody know what the jumper settings should be, going to speak to the engineer tonight and would like to be able to point him here so he can see what the jumpers should be set to, if indeed they need setting based on the pics I posted ?

Don't know if it is a repaired PCB but as you said writing on it suggests that it might be - will ask the engineer.

I'm thinking of getting another engineer to come and have a look, will he be able to set the jumpers correctly without any documentation ?

Here some pics of the top part of the PCB, don't know how to remove the panel covering the bottom part of PCB - not sure if the jumpers are visible. Looks like the gas valve is a Honeywell.

ok, will upload tonight or tomorrow morning.

Engineer is adamant that the water not being hot is nothing to do with the PCB having been replaced, he is saying it has to be something else. I am in a bit of dilemma seeing as I have already spent over £200 replacing the PCB and the issue is not fixed, what's to say replacing another part will...

Wasn't going to tell him what to do - the intention was to point him to this site. Everybody in every profession has different competencies, it was just going to be a polite suggestion.