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Thanks. Does anyone have any advice on whether there would be any benefit to converting it to a sealed system?

The white overflow pipe running from the cold water (F&E) tank to external air drips constantly when either or both of the hot water and heating are on. Is that related to an excess of water going into the tank from the vent pipe? Would that be an indication of any problem?

Thanks for the reply. When you say timer, do you mean the programmed on/offs? (sorry if that sounds like a stupid question) The pcb has an option to just switch the heating on and off immediately regardless of the programmed on/offs. Both that facility and the timer work/don't work at the...

Thanks for the reply, Tony. I'm obviously not very knowledgeable about heating/plumbing, but that was my instinct - it's worked most of the time for the 4 years we've been here, so why is the way the pipework is fitted an issue? Surely that would be a permanent problem if that was the case...

The problem (as I see it) is that the heating only works sporadically, whereas the hot water works all the time. Both are operated from the same pcb and come from the same storage tank. The heating will work fine for a few days, or a couple of weeks at best, but then just stop working for...

Thanks for your replies, Dan. Is there anyone else who would be kind enough to offer some additional views? Thanks.

He indicated the pipework by the pump by the storage tank and said the "switch" that activates the heating was in that area. He said the pcb is sending the signal to the switch but it is being prevented from activating the heating due to this build up of pressure. Sound dodgy?

I have an Ideal ICOS HE18 condenser boiler (7 years old) and it's currently an open vent system. It consistently has problems with the heating (not hot water) and the E.ON engineer who has attended previously says the issue is the pressure in the pipework periodically builds and prevents the...