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No not sure what a DVM is, can you get them off ebay :) Just had a thought though, could it have anything to do with our water softener?

8.30

which is cheaper?

Every night at about 11.30pm out boiler switches on and something starts up in the airing cupboard for about 10-15 minutes. We have an Apollo boiler and this is on a timer to come on in morning and go off mid evening. Anyone know what is happening and whether it should be or not.

we've sacked him now, he really was bad!!

thanks everyone for your help. The plumber came today and refilled the radiators and the boiler works ok, well so far anyway!

Our boiler has 2 settings, Central heating and hot water, or just hot water, which I imagine would be the same with most boilers. So if the water is drained from the Radiators why can't the boiler just carry on heating the hot water system as we still have water running out of the taps?

Are you asking me? That's a bit techie :oops: HX? Or were you asking one of the experts..!

Its an Apollo

he didn't give any advice, just left the boiler on. I'm worried now...

I think we are. Our plumber didn't turn the boiler off so we assumed the hot water wouldn't be affected. As far as we knew the hot water in taps and hot water in radiators were on separate loops. We've switched the boiler off now and humming stopped which makes sense now, the pump was getting...

We have had the water drained from the radiators to replace a towel rail. The plumber left it like this as he was going to refil the system the following day (today) but couldnt make it. Today we have no hot water, the boiler was on but no water has heated up. I changed the boiler to the high...