We recently had a new electric consumer unit fitted. Afterwards our Ideal Classic LXFF&FF boiler had a fault, circuit board blown. Gas engineer diagnosed reverse polarity of supply had blown board. Electrician reinstated supply with correct polarity but disputes that the reverse polarity would blow the circuit board as they have built in protection diode. Can anyone give a definitive answer please?

Mike Butler, July 2010

check with Ideal boilers, but I would expet to blow.

erj, July 2010