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Mend Vaillant 831 Home Heating Systems

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Mend Vaillant 831 Boiler Heating Thermostat

Vaillant 831 PCB issue?

The boiler is very intermittent when it comes to putting the Rads on, the hot water is fine and has no problems.
The thermostat is working and is sending 240v/240v in and out of the board. When I push the temp up on the thermostat the boiler will try to turn on but fails, however it will turn on when it feels like it..
There is a enough pressure in there cause when it works it works...

Does this sound like a PCB issue ??

Nick
February 2014
VaillantVaillant 831Heating, Home Heating SystemsBoiler Heating Thermostat
Thanks, there is no fault code... :-(

Nick
February 2014
Why not try change heat NTC if might be problem PCB is most expensive item on boiler unless boiler fault code say

ltd
February 2014

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