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Hi The plot thickens!! It now appears to be the multiport valve. as the problem only happens when the heating and water is selected. if it is on water or heating only all appears OK.. Methods of elimination here I think. I am going to change the valve . Will post my findings here later on. Thanks

Good info..cheers.. I have drained the system down, cleaned out the header tank and re-filled, put in Fernox (flushing/cleaning agent) I will leave this in for a few days and drain , flush refill.. Qestion is : why does it only overpump now.. I have lived in the house for 10 years without a...

I have been in loft and made sure ball cock is OK.. Its not sticking, the small pipe you refer to, I take it you are refering to the cold feed from the tank to the CH system not the rising main feed .. The level in the tank was quite high- about 4" from the top.. I was thinking of shutting down...

I am have a problem with Hot water in my Ch header tank in the loft, this is obviously coming from the vent pipe to the tank , but Why?? I have turned down the pump and turned down the tank stat to try to solve the problem. The header tank is now full of brown hot slime in the bottom.. is this...