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The problem was a faulty (new!) thermister - worse than the old one! Replaced it with another new one and no probs. Problem solved. Thanks again for help and advice. Regards, Neil.

I finally found the right washers - after a trip to 5 plumbers merchants. The big one at the back of the diverter was particularly hard to get. I succumbed to temptation and loosened the grub screws, rotated the diaphragm housing, undid it's cover and reorientated the other inlet -...

Well, the 3-way diverter valve and the thermisters arrived today, but not one damn washer between them. Marvellous. The valve is supposed to ba Giannoni type 'F' (DV.130), with an "F" moulded into the body and "193406H4" engraved on it. It doesn't look like the number on the one in the...

Thanks richw! I have ordered a complete new 3-way giannoni (I think you spell it like that!) valve - it looks exactly the same as the one in the boiler so it might be an original part, and two genuine Ravenheat thermisters. I didn't think to order new leads to go with them - that's a smart...

Thanks! clf-gas: that's what I'll do, thank you! ChrisR - I think the manufacturer's website is confusing me here - it looks like they have used the same pic with the 90 degree off-set for each item. I'll go for the 'F' as you suggest, thank you. Thanks again for the considerate and...

Tony: I don't hate spending money, I just haven't any to spend. Big difference! And as for not bothering to sort problems out - please! Why do you think I am posting here? I haven't renewed the thermister yet for the simple reason that I have just discovered it is faulty and to replace it...

Hi! I've had a series of problems with my Ravenheat RSF 100ET combi boiler. It's about 6 yrs old and ran perfectly for 4 yrs or so. I have had to 'thump' it from time to time (at the top) to get it going, then the clock went haywire - solved by installing a new one. Then the boiler would...