Vaillant ecoFIT pure Installation And Maintenance Instructions Manual - page 30
Appendix
30
Installation and maintenance instructions ecoFIT pure 0020230535_01
Code
Meaning
Cause
F.61
Fault: Gas valve regulation
–
Short circuit/short to earth in cable harness for the gas valve
–
Gas valve defective (coils shorted to earth)
–
Electronics defective
F.62
Fault: Gas valve switch-off delay
–
Delayed shutdown of gas valve
–
Delayed extinguishing of flame signal
–
Gas valve leaking
–
Electronics defective
F.63
Fault: EEPROM
Electronics defective
F.64
Fault: Electronics/NTC
Flow or return NTC short circuited, electronics defective
F.65
Fault: Electronics temp.
Electronics overheating due to external influences, electronics defective
F.67
Fault: Electronics/flame
Implausible flame signal, electronics defective
F.68
Fault: Unstable flame signal
Air in gas, gas flow pressure too low, incorrect air ratio, condensate
duct blocked, incorrect gas restrictor, ionisation flow interruption (cable,
electrode), flue gas recirculation, condensate duct
F.70
Invalid device specific number (DSN)
If spare parts fitted: Display and PCB replaced at same time and DSN
not reset, incorrect or missing output range coding resistance
F.71
Flow NTC fault
Flow temperature sensor signalling constant value:
–
Flow temperature sensor incorrectly positioned at supply pipe
–
Flow temperature sensor defective
F.72
Flow/return NTC fault
Flow/return NTC temperature difference too great → flow and/or return
temperature sensor defective
F.73
Water pressure sensor signal in the wrong range
(too low)
Interruption/short circuit of water pressure sensor, interruption/short
circuit to GND in supply line to water pressure sensor or water pressure
sensor defective
F.74
Water pressure sensor signal outside correct
range (too high)
Line to water pressure sensor has a short circuit to 5 V/24 V or internal
fault in the water pressure sensor
F.75
Fault: No pressure change detection when start-
ing pump
Water pressure sensor and/or pump defective, air in the heating installa-
tion, insufficient water in the product; check adjustable bypass, connect
external expansion vessel to the return
F.76
Overheating protection on primary heat ex-
changer has responded
Cable or cable connections for safety fuse in primary heat exchanger or
primary heat exchanger defective
F.77
Fault: Flue non-return flap/condensate pump
No response from flue non-return flap or condensate pump defective
F.83
Fault: Flow and/or return temperature sensor
temperature change
When the burner starts, the temperature change registered at the flow
and/or return temperature sensor is non-existent or too small.
–
Insufficient water in product
–
Flow or return temperature sensor not in correct position at pipe
F.85
Fault: Flow and return temperature sensors
incorrectly installed
The flow and/or return temperature sensors have been installed on the
same pipe/incorrect pipe
F.87
Ignition transformer not connected
Ignition transformer plug not plugged in or has come loose, multiple
plug on the PCB not plugged in correctly, interruption in cable harness,
electronics defective
F.88
Gas valve not connected
Gas valve plug not plugged in or has come loose, multiple plug on the
PCB not plugged in correctly, interruption in cable harness, electronics
defective
F.89
Incorrect pump detected
Unsuitable pump connected, PWM plug not plugged in or has come
loose, multiple plug on the PCB not plugged in correctly, interruption in
cable harness, electronics defective
con
No communication with the PCB
Communication fault between display and PCB in the electronics box