Appendix
0020230535_05 ecoFIT pure Installation and maintenance instructions
31
D
Overview of fault codes
Code
Meaning
Cause
F.00
Flow temperature sensor interruption
NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
F.01
Return temperature sensor interruption
NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
F.10
Flow NTC short circuit
NTC defective, short circuit in cable harness, cable/casing
F.11
Return NTC short circuit
NTC defective, short circuit in cable harness, cable/casing
F.13
Warm start sensor/cylinder sensor short circuit
NTC defective, short circuit in cable harness, cable/casing
F.22
Safety switch-off: Low water pressure
No or insufficient water in the product, water pressure sensor defective,
cable to pump or water pressure sensor loose/not connected/defective
F.23
Safety switch-off: Temperature difference too
great
Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round
F.24
Safety switch-off: Temperature rise too fast
Pump blocked, insufficient pump output, air in product, system pressure
too low, non-return valve blocked/incorrectly installed
F.25
Safety switch-off: Flue gas temperature too high
Break in plug connection for optional flue gas safety temperature limiter
(STB), break in cable harness
F.27
Safety switch-off: Flame simulation
Moisture on the electronics, electronics (flame monitor) defective, gas
solenoid valve leaking
F.28
Failure during start-up: Ignition unsuccessful
Gas meter defective or gas pressure monitor has triggered, air in gas,
gas flow pressure too low, thermal isolator device (TAE) has triggered,
condensate duct blocked, incorrect gas restrictor, incorrect spare part
gas valve, fault on the gas valve, multiple plug on PCB incorrectly
plugged in, break in cable harness, ignition system (ignition transformer,
ignition cable, ignition plug, ignition electrode) defective, ionisation
current interrupted (cable, electrode), incorrect earthing of product,
electronics defective
F.29
Failure during operation: Re-ignition unsuccess-
ful
Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, defective earthing of product, ignition transformer has spark
failure
F.32
Fan fault
Plug on fan not correctly plugged in, multiple plug on PCB not correctly
plugged in, break in cable harness, fan blocked, Hall sensor defective,
electronics defective
F.49
Fault: eBUS
Short circuit on eBUS, eBUS overload or two power supplies with differ-
ent polarities on the eBUS
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
