Glow-worm Boiler F22 Fault: Low Pressure
The Glow-worm F22 fault code, like the Vaillant boiler F22 fault, indicates low boiler pressure and must be repressurised to fix it. The first thing you need to do is check the pressure gauge and if it’s low, repressurise it until it’s at 1.5 bar. I have been repairing boilers for over a decade and this is how to […]









