I would appreciate some help on this problem.
In central heating mode the boiler works very well and with the temperature dial set at Max. the display lights go up to 80.
In hot water mode the boiler comes on and runs for a minute or two until the display lights get 60 and then the burner cuts off. At this point the '50' light flashes and the water from the hot tap runs cooler. Looking at the MI the flashing light indicates a heating sensor failure.
I checked the sensor resistance and it read 3.7Kohm @ 60°C. The MI states 10Kohms @ 25°C. (I also checked the DHW sensor which I believe is the same and got a reading similar to the MI value)
I tried turning the power on with the sensors disconnected and the '50' light flashed with both the CH demand and DHW demand off.
I would conclude the heating sensor is faulty but I would greatly value any input from others who may have experienced this problem
In central heating mode the boiler works very well and with the temperature dial set at Max. the display lights go up to 80.
In hot water mode the boiler comes on and runs for a minute or two until the display lights get 60 and then the burner cuts off. At this point the '50' light flashes and the water from the hot tap runs cooler. Looking at the MI the flashing light indicates a heating sensor failure.
I checked the sensor resistance and it read 3.7Kohm @ 60°C. The MI states 10Kohms @ 25°C. (I also checked the DHW sensor which I believe is the same and got a reading similar to the MI value)
I tried turning the power on with the sensors disconnected and the '50' light flashed with both the CH demand and DHW demand off.
I would conclude the heating sensor is faulty but I would greatly value any input from others who may have experienced this problem