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how can i fix my protherm boiler?

my protherm boiler lcd is showing f3 how do i fix this problem?

chrissy
May 2007
Heating, Home Heating SystemsProtherm Boiler Problem
IF ITS THE RIGHT BOILER AS IM GOING FROM A PROTHERM 80 EC THEN F3 MEANS HEAT EXCHANGER BLOCKAGE, I TAKE IT THE BOILER SHUTS DOWN BUT THE PUMP STILL RUNS

paul
May 2007

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