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If you have a motorised valve(s), are they in the manual (open) position? have you actually checked the header tank?

Well I haven't fitted one of these, but every other RF system that I have installed has got dip switches in the transmitter and receiver that can be reset to suit the environment. The MI's will tell you everything you need to know.

It's possible that another RF unit nearby is having some effect on your dads receiver. The symptoms of it working sometimes, but not others, certainly fit. If this is the case it should be possible to alter the addressing scheme to counteract this.

And to be honest, I'm not too happy about the safety harness. :wink:

Are you smoking a fag on a customer roof? Now that's what the HSE would get you for now I reckon. Passive smoke infestation, five years hard time.

It's not too bad if you have a few drinks first to steady yourself :wink:

A flexible flue liner? All you need is a ladder, a roof ladder, some string, sand & cement, the flue / associated bits and nerves of steel :lol:

Yes it is easy.

Are your skirting boards really pink?

Didn't the bloke on rogue traders say that he had to replace the coil? he turned up with a diverter valve which oddly did not solve the problem of a non firing boiler. So, my guess is the OP is talking about the DV.

How about this

Your link doesn't work and no one has the faintest idea of what sort of system you have.

He's saving you money and you're questioning his honesty and professionalism? Oh, he is right in what he says.

What parts are not instantly available for a Honeywell 3PV? I would expect all serviceable parts over the counter at any decent merchants.

All WB's do I believe and I dunno, I just install them. No doubt some clever monkey will proceed to give you a metalurgical analysis etc 'cos there are a lot like that here! Ha! no sooner said :lol:

Why not just turn off your stopcock?

Unless you have pipe-work of unknown provinence buried in screed, you should have no worries re a system boiler. If you really want an open vented 'A' rated one, worcester do a good 'un.

Check voltage to white wire on 3PV, if present verify orange 0V. Otherwise, if white not 230V track back to room stat and finally programmer. The answer is seconds away.

This sounds like a 3-port valve to me.

Did you want it to be on? how do you normally control it?