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Just over the past couple of days, the screen image on our LG Flatron monitor has started to shake or flicker. It's like the old Roobarb and Custard cartoon, if any of you are old enough to remember that. I fitted a new PSU in the pc recently but it was fine afterwards, for about a week until...

I ran a cable out to my shed at the end of the garden. It's a heavy duty armoured cable, 50m run or thereabouts, buried in the garden for most of its length. At the houuse end, it terminates at a junction box and ordinary 2.5mm T&E cable runs to the consumer unit, where it's wired into a...

OK cheers. Just closed down the hot ones and there's some heat coming through downstairs now. Not exactly toasty though. Just warm. I'll give it a while to see.

I have a fairly old vented system, hot water cylinder and a Glow-worm Fuelsaver30 boiler. The pump was renewed 2 years ago for a Gundfoss, which is running OK. I've just replaced the 3-way valve as previous advice on here indicated the head was shot. All seems ok; the electrics are working fine...

Cheers Dave, you're a star. :mrgreen:

This one then? Is there a difference between the 4073 and 4073A? http://cgi.ebay.co.uk/NEW-IN-BOX-HONEYWELL-3-PORT-22MM-V4073A-VALVE_W0QQitemZ300208112582QQihZ020QQcategoryZ3191QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

This looks like the fella? http://cgi.ebay.co.uk/Honeywell-3-Port-Diverter-Valve-V4044C-1288-22mm_W0QQitemZ280209651112QQihZ018QQcategoryZ3191QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Bugger. There's sod's law for you. How dear (roughly) are these if I go down to the plumber's merchants then (or B&Q if that's cheaper)? I suppose the old one can't be repaired? BTW thanks for all your help. Isn't t'internet brilliant?! :D

Ah, right. It's a Landis & Gyr, model MA-V322.

Er...ok. Lol! Now I'm going to sound thick... Sorry, I'm pretty handy at DIY but sometimes don't know the technical terms for the bits and bobs. Which bit is 'the head'? Not the pump head?

Yes it's a 3-way valve. inlet port and A-B outlets. I've put the hot water and heating to 'on' and yes, the rads are now heating up.

Is that the 'A-B' valve (in a small metal box) near the CH pump? Has a little lever poking out of one end?

Not right now. Don't want to go into details but unlike most people we can't just whip out a credit card or stick £100 on the overdraft. As the boiler responds to demand for HW, and the pump etc are working, it 'must' be something like the clock's CH circuit.

OK, I've established that when the hot water demand kicks in, the boiler comes on and works fine, as it should. It's only the heating demand that fails to produce a response from the boiler. So it ain't the boiler. Sigh...

Hmmm...no sign of a pcb anywhere. The electrical side is very simple indeed - input terminals, then a transformer, then a thermostat. Nothing else except a basic thermocouple leading up to the boiler. I've no idea of its age, but it's to BS 800: 1977!

Well, the heating should be on (indicator light on clock is lit up). Just checked for voltage and there's none. Poked a neon tester into the live input terminal and nothing.

Gas valve? That doesn't sound like a DIY job... :?

We have a rather elderly boiler, a Glow worm 25-30, which has worked fine until just these past few days. It heats up a cylinder on the floor above. On Friday however, it failed to come on for the evening shift. The pilot was lit, timer set properly, and the thermostats were all set right...