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I have a Eurocal 70/90 Combi Oil Boiler. A problem has developed in that the first upstairs radiator on the system stays hot all day, even when the heating system is switched off and both room and frost stats are set so that the heating should not come on. The boiler is switching on and...

I have a Eurocal 70/90 Combi Oil Boiler. A problem has developed in that the first upstairs radiator on the system stays hot all day, even when the heating system is switched off and both room and frost stats are set so that the heating should not come on. The boiler is switching on and off...

Charged the pressure vessell with a footpump to 0.8 bar and tightened up a compression joint to stop a minor leak - Everything now works fine, and the water pressure in the system has remained steady for two days now. Thanks for your advice.

Thanks Oilman. I will check the pressure next time the boiler trips out. Chris

Thanks for the reply Oilman. I'm not sure if I have a leak or not, but if my problem is not an undercharged pressure vessel, and no obvious problem with a leaky pressure relief valve, a hidden leak is under the floorboards is the only other thing that I think may explain why I have to top up the...

Can I use a leak inhibitor additive in my combi boiler, without damaging the rubber seals on the plastic heating pipework?

I have a eurocal 70/90 combi boiler. What air pressure should there be in my pressure vessel when the water pressure is 0 bar and the system is cold? The system supplies an average size 3 bedroom two storey house.