John
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Registered: 30th Jun 03
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Mate got me a boiler, hence my new thermostat from the other thread.
It's turning out to be a complete lemon and he's in Japan so can't help me just now.
Main problem is with hot water, when it's on hot water only, it can sense the water flow, hall effect sensor lights, water light lights, boiler fires up for about 5 seconds then goes out.
If it's on heating + hot water, if the boiler is up to temp for the radiators, I get hot water until all the residual heat is lost. The odd time it will look like it's working properly but that's about 1 in 50.
I've tried a new thermistor, checked the diverter valve motor thing, it goes out for heating and then back in for hot water. I stropped off the pump and had a look, it looks ok and I can feel it coming on.
I'm out of my depth now and although I've now worked out how to drain it, had a lot of water getting out when I loosen the wrong thing.
It's a promax he 28 plus A I think, any of the resident plumbers got a really easy fix?
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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does the demand light stay on?
any fault codes?
what colour was the thermistor when it came out?
use the wee drain under neath to drain it?
promax is usually a decent wee boiler mate,
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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check there aint an airlock, auto air vent at the top of the boiler next to the flue if you have the later style boiler?
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John
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Registered: 30th Jun 03
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Demand light stays on, it definitely knows there's a tap turned on. No fault codes.
Thermistor was a bit black but the brand new one didn't fix it.
I've drained it twice tonight, had the pump off, taken the wee filter bit from the manifold at the right hand side out but was clean.
There's a vent thing at the top left hand side beside the flue, does it need opened or something?
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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Try opening that to see if you get any air out. What boiler was in before? Was it a combi?
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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These have also got a flue sensor which acts as an overheat as well, if you get high co readings it will cut out, noticed on a few of these they haven't been set right from the factory and needed adjusted but you would need a combustion analyser for that!
Tbh it's prob something simple mate
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John
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Registered: 30th Jun 03
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Wasn't a combi was an old baxi with a cylinder.
Tiny bit of air came out that top vent.
I hope it's simple, all the individual components work. Need to wait for my mate to come back with his analyser.
[Edited on 13-06-2012 by John]
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John
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Registered: 30th Jun 03
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Played about with it a bit more last night.
It seems I can get it to fire if I let the water run for a bit at maybe halfway, then turn it up and it's fine.
That point to anything different?
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Gary
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Registered: 22nd Nov 06
Location: West Yorkshire
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Whats your water pressure like where you are?
My mate was having problems with his hot water, turned out his water pressure was forcing the water through the boiler before it had chance to heat up.
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John
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Registered: 30th Jun 03
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Water pressure is quite good but there's a gate valve on the input, turning this down doesn't solve it.
It worked when it was first fitted as well.
Is there any possibility that the shit stirred up from the 20 year old previously storage fed pipes has blocked something?
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Gary
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Registered: 22nd Nov 06
Location: West Yorkshire
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 @ not flushing before new boiler john
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John
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Registered: 30th Jun 03
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I'm not a plumber, I'm making this up as I go along.
Could I do it now it's in without flooding the place?
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ash_corsa
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Registered: 15th Apr 04
Location: Shrewsbury
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Who wired it up?
Is it s or y plan system?
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Gary
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Registered: 22nd Nov 06
Location: West Yorkshire
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quote:
Originally posted by John
I'm not a plumber, I'm making this up as I go along.
Could I do it now it's in without flooding the place?
Yeah. You should have a drain off on your lowest rad. Jist attatch a hose to it and drain
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John
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Registered: 30th Jun 03
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My mate works for Scottish gas, he fitted it.
No idea if y or s plan.
I know where that drain is, the radiators work fine though.
I'm getting fed up looking at it. My old one worked fine.
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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Won't be an s or a y plan, it's a combi!
Tell him to chuck a filter on it, save all the crap getting into the boiler.
Where u from John?
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John
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Registered: 30th Jun 03
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Up near the campsies.
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ash_corsa
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Registered: 15th Apr 04
Location: Shrewsbury
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quote:
Originally posted by deanmcreynolds26
Won't be an s or a y plan, it's a combi!
Tell him to chuck a filter on it, save all the crap getting into the boiler.
Where u from John?
Sorry miss read the first post!
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deanmcreynolds26
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Registered: 15th Sep 03
Location: E46 //M3
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Who's your mate? Might be my workmate
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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I had this the other week. with a promax.
it was brand new, fitted it, fired it up, heating was working ok, when hot water was called for the fan would speed up and slow down repeatedly. folowed by a woooshing noise.
I checked the inlet pressure and it was 13mb. checked it was set right and it was.
stripped the gas pipe out and it was blocked full of black carbon confetti. renewed the gas carcass and it was ok
I fit a promax everyday of the week nearly. they are a great boiler. I have one myself. never have much go wrong from new, it will be something to do with the rest of the system
deffo get someone to have a look at the gas pressures on it, heating doesnt use the full 28kw so it will work on heating ok, its only when the gas valve is full open for hot water you will get problems
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John
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Registered: 30th Jun 03
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I'll just need to wait until he's back then. I don't mind the water, worst I can do is get a bit wet but don't want to touch the gas side of it.
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John
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Registered: 30th Jun 03
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Just had the gas board out, meter replaced, supply to my house looks like it's too low, dropping to 14mbar for those in the know.
Coming back tomorrow to fix it. Looks like it's nothing to do with boiler 
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John
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Registered: 30th Jun 03
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Still not fixed, dug the street up, dug my garden up, now replacing the 20mm with a new 25mm.
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Aaron
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Registered: 9th Aug 04
Location: Cottingham, East Riding
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I feel sorry you John.
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John
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Registered: 30th Jun 03
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Thanks Aaron. Apparently Scottish Gas do too. You get £20 compensation for every 24 hours after the first 24 hours it's been off
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