Appendix
30 Installation and maintenance instructions SUSTAIN ..r 0020200958_00
Fault code Meaning Possible cause
F.67 Value sent back by ASIC is incorrect
(flame signal)
Implausible flame signal, electronics defective
F.68 Fault: Unstable flame (analogue input) Air in gas, gas flow pressure too low, incorrect air ratio, incorrect gas re-
strictor, ionisation flow interruption (cable, electrode)
F.70 Invalid product code (DSN) Display and PCB replaced at same time and Device Specific Number not
reset, wrong or missing output range coding resistance
F.71 Fault: Flow/return temperature sensor Flow temperature sensor signalling constant value: Flow temperature sensor
incorrectly positioned on supply pipe, flow temperature sensor defective
F.72 Fault: Deviation in the water pressure
sensor/return temperature sensor
Flow/return NTC temperature difference too great ā flow and/or return tem-
perature sensor defective
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
Connection No communication between the PCB
and the user interface
Electronics defective
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