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Thanks mickyg. I realise I'm in the realms of damage limitation here but I reckon one of those filters, as you say, can do no harm and might help remove some of the crap out of the system. Seeing just how small those ports are in the inside of the servo valve makes me realise just how clean the...

Just a quick update for those still interested! The boiler stopped working again. This time, the diverter valve was resolutely staying in the centre position. It wouldn't move either way. Checked all the little servo pipes again, still nice and clear so I reckoned it must be the servo valve...

Indeed...which is sad really...I know these old boilers may not be the most efficient things in the world but they are built like tanks and, with most parts still available, there really is no reason why they should not be repaired fairly cheaply rather than written off. I fully expect that if I...

A quick update. Although I had got it all working, late on Christmas Eve, the central heating packed up. Checking the diverter valve showed that it would now not move away from the DHW position. I was reluctant to tear into it until today as we still had hot water and if I started to...

Thanks Gasguru....a few bits to look at!

Hi folks, I have joined the forum after a google search showed there to be some knowledgeable folks here regarding these old Vaillant boilers! I have had the boiler for over 20 years now and it has been a model of reliability really. The only things I have had to do to it are replace the...