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I've certainly been educated in my few days here, I will be hanging around I think. I didn't get chance to grab a new switch today but it's on my to do list. It is still working like a good un and I'm still grinning at the thought of not spending cash. I have a bad damp problem to sort out...

Regardless of how gentle your driving style is it needs to be sorted straight away. It's going to be an expensive and regrettable event if you do lose oil pressure. Also be aware that all the swarf from any repair to the sump thread MUST be cleaned out of the sump. You can buy "flushing oil"...

I would guess that it will be power supply ripple that throws it into confusion rather than voltage. There's not much in the way of decoupling on the PCB. I wouldn't have spotted that unplugable terminal block and would never have thought to disconnect the boiler had it not have been put on a...

Aye sorry about that. flipant is my middle name. I served my time as a mechanic back in the dark ages, you should see some of the bonus bashing examples I've worked by over the years. One thing I wish I had taken a photo of is the PCB itself. I opened the plastic housing to look for...

Hot news chaps! I took a look at the spur connector on the bottom of the boiler, it looked ok so I unplugged it and switched on the mains. The fizzing was still there with the boiler completely out of circuit. Sticking my head into the cupboard it sounded like it was coming from the switch...

Thanks for the extra input on this. I had suspected the overheat stat originally. The water temperature has recently been cooler than usual but the boiler never failed to light. Until I opened the cupboard door that is.......... shambolic, where would I find the earth point or is it...

Great, thanks for that. I'm just having a pot of tea then I will go and see what's what with it. Many thanks John

Thanks for the swift replies. I have taken the front panel off but can see no evidence of a water leak anywhere. I will check again once I can straighten up, I'm getting too old for cramming myself in cupboards! The boiler is only 4 years old, that's better than many have got out of theirs...

Having found this forum whilst googling the HE24 fault code I thought I would check with the learned before buying parts. It seems the Isar boilers have a poor reputation for reliability, mine is no exception. Over the last couple of weeks the hot water has been cooler than normal with the...