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Viessmann trimatik MC B control cutting out on heat up
Hi all , any help on this would be appreciate, my friend has a viessmann vitola biterral oil boiler fitted with aTrimatik MC B control panel
All worked fine for some years now, but recently problem on the central heating it will start to heat up then after a short time 20 mins approx, it will actuate the mixing valve and begin to close this until eventually it goes into blue zone and cuts off the boiler
the only way I have been able to make the boiler function is to disconnect the heating flow sensor situated on the flow pipe about 1meter away from the boiler.
I have checked all fuses wiring etc
the sensor appears to give the correct values but I am not convinced
the diagnostics on the Trimatik do not indicate any fault with sensors
any thoughts or comments ?