Appendix
0020230531_01 ecoFIT pure Installation and maintenance instructions
35
Fault code
Meaning
Possible cause
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
