potterton housewarmer 55 bbu;intermittantly sounds like jet engine?
potterton housewarmer 55 bbu,when central heating on and working fine,intermittantly seems to become turbo charged and sounds like a jet engine ,as if it is being supplied with aload of fuel all at once;then goes back to normal,;goes back and forth like this;any ideas thank
NEIL, February 2007
