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OK I stand corrected on that

Err what do you mean ? The pcb looks for the rectification effect of which is a property of the flame It SENSES the flame

Because ... The OP is not a RGI

Not particularly You, however, have an interest in keeping a closed shop, don't you An argument which is not relevant to the point that safety and competence are not one and the same thing - however you want to dress it up

so, TW and 45yearsold - would you care to to say how many ultimate boilers you've worked on in, say, the past year? sort of order of magnitude, rule of thumb answer would be good enough lets be generous and include micron 100 &120 boilers

There are a number of fitters out there who are not competent, who do not know enough, who have failed to keep up with technology, or whatever There are a number of people out there who are not gas safe who are competent I cannot precisely define competence nor can the H&S exec. You have...

Just a thought, has he set the jumpers correctly?

dirty pilot is covered by "electrode not in flame" Ultimates, IIRC have a PTFE insulated HT lead and are not so prone to being faulty

then you are wrong

since advertising is not allowed here, you will haver to do your own donkey work

see my post in the Potterton Profile Prima Air Pressure sensing" thread for an explanation of how the sequence should be If you can smell gas and the PV solenoid is opening, but you have no spark, unless the HT lead is shorting to the case, then the problem is wikh the pcb (407677)

Above, you said it was a standing pilot (by which I presume you mean permanent pilot). If so, then these should be, as they say, a permanent pilot and it's not letting throuigh, it should be there all the time. Would you like to clarify one way or the other before the OP wastes money on getting...

The sequence goes like ths: If the two white stat wires see a short circuit and tre air pressure switch has a good low ohmic ( ~<1ohm), between the normally closed contacts and common, when mains is applied across live and neutral of the pcb, the fan comes on. The fan activates the APS and...

Without being sarcastic Your boiler has electronic ignition, you will hear a click, click, click of the spark to ignite the gas from the pilot. The classic also has an electronic version, but I I've not come across the perm pilot version (a bit old) There is the possibility that the...

I have them on the shelf

The sticky says "Competence is only proven by passing ACS exams and having the ability to carry out certain safety tests required by law ." This is not correct. The ACS exams are only there to show that the fitter is SAFE to work on the relevant gas appliances, NOT that he / she is...

They are those who are sometimes mistakenly called "engineers" They do not engineer anything, they are not allowed to. They fit parts which, hopefully, are the parts that actually need replacing. Unfortunately, this is not always the case

Its the other one, duh ! the one with the wotsits on

they are not engineers, they are fitters and yes there are a number of "get a man in" nazis here

just because the shaft is turning doesn't mean that the pump is working. The impeller can shear off (ceramic) shafts The OP needs to hold the pipe and feel the water flowing or not Could it be the diverter valve not opening or something like that ? Isn't there some common fault with the...