Central Heating

Ariston combi boiler problem

Anonymous user 23/02/2024 - 2.41 PM

Our Ariston combi boiler 27 mffi is losing pressure at night, and drops to just under 1 bar, its topped up to 1 bar in the morning. However, when the heating is switched on it goes up to 3 bar. We've checked the pressure relief valve, and no water has escaped at all. We did have a service plan for 2 years, but they let us down when we called them out last year, so that has now been cancelled. We had the heating on for an hour this morning (very chilly for May!) the pressure was at 3.1 bar. Should the prv release pressure at this stage, and is it likey to be not working? Could it overheat? The boiler is 7 years old and was fitted by the previous owners.