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its a grant, not sure what model. Today I emptied the balls out of the combimate and cleaned behind the red plastic inner which was thick with whatever the balls are made of. Thought that might have solved it but the flow is only slightly better at the showers but still not enough to run hot...

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Thanks very much for your knowledge, the mag one must be a red herring. Any ideas what might cause my problem please?

I have a grant combi boiler with a combimate and Mag One fitted it the system. Recently the Mag One started leaking. Heating engineer replaced whatever is inside and cured the leak. Since then, the shower is feeble and there isn't enough hot water to overcome the cold water pressure in the basin...

It must be a pretty basic to learn if that's your trade. Thanks guys

Thanks DP. I'll give a trusted sparky a ring now I have your wiring diagram. Probably have to wait til after Crimble now but at least I can fire the boiler up by running off hot water. Just have to keep cleaning things!

sorry to have started a bit of a discussion.... The only reason I'm trying to diagnose it myself is that Ive had 3 experts charge me an arm and a leg to achieve nothing. I'm running out of professionals to ring! I'm a mechanical engineer but electrics is beyond me but thanks for posting the...

Thanks again. Unfortunately I cant manage to get photos. I will ring an electrician on Monday though. Appreciate everyone's help.

Thanks for the answers. I had already had the valve electrical bit replaced by another Grant approved engineer because the rads came on when HW selected. We just lived with it for a year. Then the boiler started cutting out and the next Grant bloke said it was air. Consequently Ive spent 6...

I have a vented system with a bog standard Grant external boiler. Basic Drayton timer and room stat. Radiators all come on even if only HW is selected. The boiler cuts out when hot water reaches temp. I've proved this by turning the stat up and boiler fires up. The Grant approved engineer...

Many thanks for sharing your knowledge. Looks like HS38 it is then

I have a Combimate fitted about 450mm above a Grant combo boiler in a very warm room (29ish degrees C). A different heating engineer to the one who fitted it 6 years ago, says I should replace it with a magnetic water conditioner as the Combimate can do more harm than good to the boiler. what...

Much appreciate the replies. Thanks Freddie, you have basically answered my question in one. Unfortunately, it isn't deep enough to use as a basement so that's out. Thanks again for all the advice

Many thanks for the replies. Its on a slope at the top of a 5metre hill so I hope the water table wouldn't rise. Random Grinch, thanks for posting the Chanel 4 programme. That looks like a good solution. Would the jabfloor need oversize on top or just screed? Thanks

I have a 4.5m x 9m indoor swimming pool that I want to cover over so I can make the building into a granny annex for us to live in (the kids are having the house). I'm after advice for the best way to do this please. Thanks

OK. Thanks for the info. It seems to be working on demand now but did not come on last night in -3 degrees so I guess the frost stat is not working either?

Thanks for the answers. I'm not sure it has activated now. The button is out and won't even try to reset, just springs straight back out even with the boiler stone cold. But it fired up on demand last night then went off after 30 mins. its has fired up this morning from the indoor control.

I've just had a better look for anything obvious. The 2 little copper wires from the overheat reset button are loose where they go into what I guess is the thermostat. I literally touched them and the boiler is going now but the button will no reset. Any ideas on that please? Thanks