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So system has been idle for 3 months but when I restarted it this week I have noticed the top floor radiators are heating up when the hot water is on. Simple I thought, just a stuck diverter valve, but no that is all working fine. Through testing I can see that the both the CH and DHW...

I would welcome a bit of done it before advice! Having put up with tv interference I decided to buy a supressor from satcure. I fitted it to the thermostat contacts as instructed, but this caused the boiler overheat switch to cut in suggesting the supressor caused the thermostat to stop...