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Hi, I believe the mercury vapour valve for the 10-16 is now obsolete, I tried various outlets to see if they still had one in stock - couldnt get one anywhere. However, I got lucky and found a nearly new one on ebay for less than £40 which I had fitted by a corgi friend, Although the...

Thanks it appears that the metal plate holding the end of the MVV is not making a very good earth - cleaned it up and seems to be working now or at least it is firing up after a couple of clicks from the spark gen.

Still no pilot light - relay is working fine but no flame? just clicking and trying to spark

Hi, I have an old Potterton Netaheat 10-16 Mk1. Recently it repeatedly clicks many times before firing up. I beleive the elecrode gap may be incorrect or dirty. Today after returning from holiday the spark generator just keeps clicking (the fan is running) but no ignition. Any ideas - Regards Graham

For me the boiler was now totally dead, but when the engineeer came in, after testing a few components he then turned on all the heating controls including roomstat - the boiler was still dead, until he tapped the MV switch (with the two yellow wires) with a screwdriver handle. (The switch has...

Have had an engineer look at the boiler - he says it is definetely the MV - only problem is cannot seem to get hold of one anywhere, they where made obsolete as from Dec05. Some websites still have them on their parts list, but none seem to have any in stock. Anyone out their got a spare one...

Although I'm not gonna touch it, its still buggin me whats up with the mercury valve whether on cold it should be open or closed? I know the Netaheat is old but its been very reliable, If I get a new boiler what would you recommend for a conventional fully pumped sytem?

I believe it to be a Netaheat 10-16 mk1 ser. no. 22892 and been looking on this web site at schematic drgs, but none seem to match exactly? http://www.partsarena.com/baxi/ But warnings heeded, just thought it might be somethin simple like changing APS, thermostat or Spark generator myself...

So perhaps the MV is ok, from cold the switch is open. Maybe the thermostat needs replacing, boiler is totally dead at present, the termostat clicks but there's absolutely nothin else, no relay clicking or fan either? Might take a trip to the Potterton Graveyard

Thanks guys for your rapid response, Dont think I will mess to much with this boiler! Will get corgi to have a look, although I have already tested and eliminated the fan and the relay are both in good working order but the MVS is open cct when cold - must be the culprit. I have seen these on...

I have a Potterton Netaheat 10-16, the boiler fires up for a short while then cuts out and will not come back on until the outer cover is removed and replaced. When I turn up the boiler thermostat it clicks but nothin happens (the relay doesnt energise) there is a closed cct across the...