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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

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