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Potterton kingfisher mf, water boils over and fills F&e tank?

Potterton Kingfisher mf, water boils and fills the F&E tank. Have changed the thermistor and the thermostat. Whats next to change?
Graham S, August 2007
Did you ever find the cause of the problem? How did you fix it? The reason I ask is that I have the same problem with the same boiler.

Darren Bennett, October 2007
what state is the water in f/e tank ?

your system is pumping over. most times due to a blockage in pipework.
turn your pump speed down to 1 for now and your boiler stat about 2/3 until problem cured
that way there is less chance of pump over

hi-spec plumbing, August 2007
link Click here to see other fixes for Potterton Kingfisher MF.