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If you're covered, get them out -you are paying for this Are you in a hard water area? could be build up of limescale or a blockage, or a CH fitter trapped in the pipes

that is simply not true

in this order 1 - pcb fault 2 - HT lead discontinuity 3 - electrode not in pilot flame 4 - bad earthing / someone has interfered with the wiring PCB is most likely - you do not need a gas fitter to do it for you if you can tie your own shoelaces

Wasn't it sometime in the 12-13thC that the queen conceived while the king was out on campaign and couldn't possibly have fathered the future king?

Tony - the transformer is there to protect the fuse - it invariably dies first

If the fan stalls, it can draw more current than the driver transistor in the module is rated at. Blows transistor and transformer

Hi Chris Not necessarily so, on the later pcbs the E has an extra bit og circuitry an dlacks the 100uF (?) cap in the middle of the board, for the PP it is the opposite, ... However, on the older pcbs the only difference is link LK1 which is there on the pp boards and absent for the E boards...

Well it sounds like toss to me To test the NTC you need a meter that will measure resistance, the obvious way to test the pressure switch is to use one that can measure frequency (CPC sell on that will do both for just over a tenner The relay you were describing is prolly the fan control...

I there a bit of melting of the case on the top of the main module? I got through over 800 ICOS transformers last year ! "the later V9 board (also orange)is better" ...couldn't really be worse

thermistor: 10k at 20 celscius dropping to about 3k at temperature or flow switch pulses depending on the flow rate prolly about 20-30 hertz He also said to test them when the fault condition is present, the contacts on each sensor need to be shorted. Is that correct? sounds...

Its a 470nF / 250Vac capacitor PME 271M

Lucky that they are still available, the Netaheat electronic gas valve is now obsolete

can you still hear the spark clicking after the boiler has lit? normally 13 clicks before ditchihng out and trying again

ladies, ladies, we seem to be drifting away from the point here first, lets not confuse fitters with engineers I presume from the OP's posting that it is a PPilot pcb if it has a slow speed fan, If sao, then the fact that it runs at slowe speed would indicate that the transformer is OK...

here we are Kev - I'm famous http://bbs.scoobynet.com/diy-39/398515-potterton-suprima-problems.html http://suprimafix.cozweb.co.uk/links.htm http://www.fogma.co.uk/electronics/329.html http://www.screwfix.com/talk/thread.jspa?threadID=26496&start=0&tstart=0...

better than your width certificate and a job where you spend your days unblocking other peoples' faeces and not being a northerner, of course ...

no, its just the customers who have problems

As I posted elsewhere, we had 50 go out last week - and winter hasn't even started yet. Suprimas are still holding their own though BTW - I hope that anyone servicing an old suprima is replacing the red HT leads where they find them