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Well I didn't want to count me chickens too soon but it's 2 weeks now since I checked those connections as Baz's instruction. I found nothing wrong but the hot water has fired up fine since. Thanks to all who answered my query & a big thanks to Baz for the cure which still has me confused but...

ok Thanks Baz, Preston's 60 mile from me, a tad too far. I'm not sure how to test either component. I'll have a word with my man. People just seem to replace parts on a trial & error basis nowadays.

Hi Baz, What would you be looking at now then? Where is your firm based?

Hi Tony, Thanks for the ball-park prices. I sent a message to Glow worm with the problem & the answer came back from Vailant? Maybe they are the same company now. The tech guy suggested flow meter? contradicting their own fault chart so not much help. Probably go with a Vailant 30kw min...

The CH man who came went thro' the same manual in the link, in the fault finding chart it suggests it's the user pcb. He went to get one but supplier told him no stock and he'd never sold one? That put my CH man (retired council CH man) off that idea & he phoned to say he now thinks it could...

ok boys, thanks for your input. At the moment it's working so not able to check anything. If it was just one thing for sure might be worth doing but can't be sure. If it turned out to be both + labour to fit the flow switch I'd be into best part of £300. Like you say, best spent on a new...

Hi Baz, Thanks for the instructions, I located the 2 red wires on the PCB connector, like you said very tight from the harness. The connections appear sound enough in the plug, pulled the plug, give it a squirt of wd40 & re-fitted it. Couldn't see any poor connections. The bit that...

Ok thanks Baz, I'll check it t'morra.

I should have asked, where have you found the bad connection? At the PCB or the flow switch end? And the cure?

Thanks Baz, I'll check that out. Is that wire from the user control pcb or the main pcb?

You could be right gasman. On the good side this is the only fault we've had with it. Best guess as to the fault?

Anybody familiar with this problem, please help. The hot water side & the green light will fire up sometimes on opening the tap but not always. When it doesn't fire up I close the tap & flick the elec power switch on & off a couple of times until the green light flicks on as I do it. Then...