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A number of regulars in this forum have been very kind with their time helping in another thread here (//www.diynot.com/forums/viewtopic.php?t=274445&start=0). This is looking as if the PCB on a Glowworm Micron 60FF may need replacing. I am an electronics tech, who is very used to...

History: Open vented Y plan system originally had a problem where CH could not be obtained. Doing the CH two wire test on the 3 port valve, showed that this was at fault. Replaced the 3 port valve with a Honeywell 4073 one at the weekend. I am an electronics tech, and also took a photo of the...

Hi Can I start by saying I have read the FAQ on "Draining down you CH system", however I have a couple of further queries on this procedure and would be very grateful for any advice. The background here is that even though I have replaced a faulty motor and a faulty uSwitch in the 3 port...

The system is about 9 years old, fitted in a domestic residence, and has worked fine up until a few days ago. I believe it is a Y Plan system. It has a tank in the airing cupboard and a T shaped valve fed from a pump. One side of the valve goes to the tank, the other to the 14 radiators. Boiler...