Vaillant boiler pressure - Plumbing job in Kilburn, North London

Job description

Our Vaillant eco plus boiler last night had an error code F-22. Looking at internet forums this appears to be a problem with the water pressure. Having played with the on/off taps this morning, the boiler is working but when it is switched on the pressure on the boiler increases to the the 'red' zone

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Greg arrived promptly, resolved the problem, and tested all the radiators. He was unable to explain why on/off switch on boiler wasn't working but allowed the heating to be used through the thermostat. Would recommend