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valiant combination boiler turbomax or thermo compact?

the water pressure on my valiant boiler is ok but it shows an F22 error most days and cuts out at least twice per day. Have had gas board out and have replaced pump and investigated errors but it is still happening. Any ideas? Could it be computer board replacement is the answer/
Penny Tuck, December 2010
link Click here to see other fixes for Vaillant Turbomax or Thermo compact.