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I have a gloworm swiftflow 80 combi boiler,
Recently the pressure gauge rises to 3.5bar (usually .7-1.4) when heating is on, this is then bringing in the pressure release valve automatically & discharging. I then have to top up. Could this be as simple as the water pressure switch having failed, as it is nine yrs old. When the heating is off the boiler holds it's pressure at .7 bar.
Recently the pressure gauge rises to 3.5bar (usually .7-1.4) when heating is on, this is then bringing in the pressure release valve automatically & discharging. I then have to top up. Could this be as simple as the water pressure switch having failed, as it is nine yrs old. When the heating is off the boiler holds it's pressure at .7 bar.