Sensor defective.
44. Flue re-circulation at the back of the heat exchanger.
45 Hot water tap leaking or leak in hot water piping (boiler in hot water mode)
46 Position of pump speed switch is set too low.
47 Sensors interchanged, sensors not installed properly on pipe.
48 Settings programmed with PC are saved (boiler reset by using Info button).
49 Fuse defective.
50 No mains voltage 230Vac.
51 Wrong parameter(s) entered in installer programme.
52 OpenTherm® room thermostat or conventional thermostat connected to the wrong terminal.
53 Wrong programming of step programme in installer menu or steps too long.
54 Clock programme in clock thermostat should start earlier in the morning.
55 Supply and return pipe on appliance interchanged.
56 Cable or plug to three-way valve not connected properly.
57 (Hot water) sensor is not installed properly or defective.
58 Flow adjusting cock in the cold water pipe must be adjusted.
59 DHW exchanger must be de-scaled.
60 Wire harness connectors on printed circuit board not installed properly; no code key installed.
61 Gas control valve defective.
62 Confirmation of new settings after programming with computer.
63 Wrong parameters or value outside the setting range programmed.
64 Burner control unit frequently checks the supply voltage.
65 Wrong gas valve adjustment for max. heat input.
66 Programme numbers J1 or J2 of installer programme have wrong settings.
67 Failure in boiler ventilation coupling (VKK coupling). NOT APPLICABLE for UK
68 DHW flow restrictor in boiler not adjusted properly.
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General