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Mend Vaillant Class A Condensing Boiler Fault

My condensing bioler reports low water pressure . Doesn't start?

I have a Vaillant class A condensing bioler which reports low water pressure (F22) and won't fire up at times.

It will only start after switching off and running the hot tap, then switching on with the dials turned up to full. It is then OK for a few days.
Is there any way of stopping this fault occuring?

Jim
January 2010
VaillantVaillant Class AD.I.Y, General D.I.YCondensing Boiler Vaillant Fault
f 22 is = dry fire ( causes)
too little water in appliance, water pressure sensor defective,cable to pump or water sensor defective,pump blocked or defective,pump output to low

wirecutterman
January 2010

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Vaillant Boiler Low Pressure (F22) - Fix?