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I think we need to pin down the extent of the problem. From the fact that the DNO was called in, are you saying polarity is reversing at the consumer unit too? If so, mentioning the boiler is a red herring! Cheers, Mike

Interesting. Is it just the boiler with the intermittent reversed polarity or is the rest of the circuit it is fed from reversing too? Are other circuits reversing? Is the whole house reversing? What method is being used to test boiler polarity? What make and model is the boiler...

Hi Rick, Thanks for your reply. Just what I wanted to hear! I was only concerned about the colour because I am a CORGI bod not an electrician, and I didn't want to inadvertently contravene any rules about colour coding of conductors inside appliances of which I am not aware. Cheers, Mike

I fitted a Keston C25 when we moved into this place four years ago. Did it mainly becuase I wanted one as a toy to play with, not having had much experience with steamers back then. It's gone wrong countless times. If I hadn't just become a CORGI bod myself, and had to pay someone to fix it...

I'm trying to establish what sort of single conductor cable to use to repair a relay fire inside one of these: http://www.gledhill.net/water-storage/downloads/technical-manuals/electramatemain.pdf It's a thermal store water heater. Gledhill are sending me new relays and holders but cannot...

Sadly, I occasionally visit houses suffering from this effect. I am often able to repair/make safe and re-commission the appliance(s), and it makes me wonder how many appliances BG condemn unnecessarily. Last example was only yesterday. I recommissioned a Gledhill Cormorant thermal store that...

I suggest you carefully select a specialist boiler technician to work for you instead. They know FAR more about boiler fault diagnosis than hairy arsed plumbers ;-) Cheers! Mike

Hmmm... I see, I think. Testing may not reveal dangerous workmanship, yet the PIRing electrician is expected to certify the installation is 'safe' and carry the can for his certificate. He has to issue the certificate when the installation passes a defined set of tests, yet he has not seen it...

Thanks for all the replies so far. How difficult IS C & G 2391 REALLY then? I appreciate there's a high proportion of failure but surely that's due to poor preparation, especially when the pass mark is set well below 100% About the same challenge as the gas ACSs perhaps (which are 100% pass...

Hmmm.... interesting. I spent several hours reverse-engineering the ignition sequence on this boiler a couple of years ago, and these are the notes I made. I established the MVS microswitch was closed in the cold/relaxed state. Relaxed state: When the boiler is off, the (relay)...

This is classic PCB failure on the Suprima. Virtually no doubt. The only way I can think of to prove the fault isn't intermittent gas valve failure is to fit a new one - but I've never seen a gas valve fail on a Suprima. The new board comes fitted into a new control housing with all the...

I'll second what Tony just said. The case MUST be correctly fitted for this boiler to be safe. Anyway, as yours has a relay, it must be one of the earliest models. As removing then replacing the case seems to make the difference, it may turn out that the physical disturbance is affecting a...

Good evening everybody. My first post on DIYnot.com. Just to outline my background, I'm a heating engineer and private landlord. I'm self-employed, and registered with CORGI and OFTEC. I specialise in central heating and boiler fault diagnosis/repair, and I do occasional LPG work on boats...