Appendix
0020200967_00 SUSTAIN ..s Installation and maintenance instructions 35
Fault code Meaning Possible cause
F.77 Fault: Condensate or smoke No response, flue non-return flap defective
F.78 Interruption to DHW outlet sensor at
external controller
UK link box is connected, but hot water NTC not bridged
F.83 Fault: Burner temperature sensor Burner temperature sensor is defective
When the burner starts, the temperature change registered at the flow or
return temperature sensor is non-existent or too small: Insufficient water
in the product, the flow or return temperature sensor is not in the correct
position on the pipe
F.84 Fault: Flow/return temperature sensor Values not consistent, difference < -6 K
Flow and return temperature sensors signalling implausible values: Flow and
return temperature sensors have been inverted, flow and return temperature
sensors have not been correctly installed
F.85 Fault: Temperature sensor The flow and/or return temperature sensors have been installed on the same
pipe/incorrect pipe
Temperature sensor not connected or is connected incorrectly
F.86 Fault: Underfloor heating contact Underfloor heating contact open, sensor disconnected or defective
F.87 Fault: Electrodes Electrodes not connected or they are connected incorrectly, short circuit in
the cable harness
F.88 Fault: Gas valve Gas valve not connected or it is connected incorrectly, short circuit in the
cable harness
F.89 Fault: Pump Pump not connected or it is connected incorrectly, incorrect pump connec-
ted, short circuit in the cable harness
Connection No communication between the PCB
and the user interface
Electronics defective
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