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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
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
link Click here to see other fixes for Vaillant.