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Vaillant vcw-sine, no hot water or central heating when ntc wire connected?

I can only get c. heating, no hot water when the ntc sensor wire is disconnected. I have replaced the water diverter valve - micro switch and the control pcb. I have checked that the gas differential valve, dc solenoid valve work only when the ntc wire disconnected. I have earthed the ntc wire and the boiler stops firing. I have noticed the flow switch valve does not move at all. Do you think this is the problem ?

Brandy
November 2011

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Mend Heating, Home Heating Systems
Mend repair fix Vaillant home heating systems