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Looks like it is the motorized valve. Opened it up and had someone turn on the heating and it was trying to turn the valve but was struggling. I've turned it a few times and loosened it up a bit and is now working - for the time being anyway. New valve on its way which should (Figures...

I'll check the valve later today, and post back here. I have just picked up a new one from ebay, as it was going cheap. Will replace it even if not the problem when I drain the system later this month as it does seem to have a lot of scale build-up.

This shows the main pipework... the pump was badly glogged up but I removed and cleaned it up and is working well now (Please ignore the mess in there, this is work in progress!). You can see the switch in the middle there, its a Honeywell v4073 type 3 port switch. Yesterday when I switched...

Yes, it did once or twice yesterday... but not now. Not today. The pump now only comes on when: 1. The hot water is switched on (On the timer controller) And 2. The tank thermo is turned up fairly high (I suppose this is the system asking for more hot water from the boiler?) When the...

We have honeywell control system. The thermostat on the hot water tank is a honeywel L641A1005. When the hot water is switched on (through the H525 Horstman controller) it fires up and the heating circulation pump starts, for a while but then stops. If I then turn the hot water tank...

I've had loads of problems with my central heating system recently. First off the circulation pump jammed up with debris. Managed to clear that out and get the pump running nicely but now I have another problem... The pump is only starting when I switch the hot water on as well, I also have...