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Vaillant turbo max going into lockout??

Iv got a customer with a vaillant turbo max,black front green control buttons,gc 4704425.wen heating is on,they run hot tap but sometimes goes into lockout,it happens more wen heating has been on for longer periods.iv changed NTC,differential switch,divertor valve opening as it should,Iv even turned the pump over-run down on pcb???.oh changed pump as well any ideas?????

Martin
March 2013
Tried that mate,vaillant don't know answer lol...normally don't get that many problems with these????

Martin
March 2013
Only thing it might be that air pressure switch in not holding just blow the plastic tube if only dirt in it

ltd
March 2013

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Mend repair fix Vaillant home heating systems