Report "Hi,have a problem with a vulcan eco 120 central heating unit.unit will not restart once temp drops bellow set temp on thermostat. reset button works most times,diagnostic on the unit flashes 10 times which comes up as a heat transfer problem.... now dad was a heating installer for 25 years, he told me to wait for transfer thing to cool down hit restart and off it should go.works sometimes.most of the time it will start and cut out just before burners fire up..this can go on for 2 to 8 hours..problem only happens on realy cold nights(melb)after 7 to 8 pm most service people have said its a electronics problem,and not worth fixing.have been spraying down circut board with metho and drying off with a hairdryer,power switched off..this seems to work and prevents problem from happening for a few weeks at atime.can i replace a part on the circut board,or replace whole board part no 9241 2. or should i replace unit..looking forward to taking a sledge hammer to the old one.any help much appriciated"