0020230535_07 ecoFIT pure Installation and maintenance instructions 43
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 temperature sensor short circuit NTC defective, short circuit in cable harness, cable/housing
F.11 Return temperature sensor short circuit NTC defective, short circuit in cable harness, cable/housing
F.13 Warm start sensor/cylinder sensor short circuit NTC defective, short circuit in cable harness, cable/housing
F.22 Safety shutdown: Water deficiency 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 shutdown: Temperature spread too great Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round
F.24 Safety shutdown: 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 shutdown: Flue gas temperature too high Break in plug connection for optional flue gas safety cut-out (SCO),
break in cable harness
F.27 Safety shutdown: 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 switch has triggered, air in gas, gas
flow pressure too low, thermal cut-out has triggered, condensate route
blocked, incorrect gas injector, incorrect spare gas valve assembly, fault
on the gas valve assembly, multiple plug on PCB incorrectly plugged
in, break in cable harness, ignition system (ignition transformer, ignition
cable, ignition plug, ignition electrode) defective, ionisation flow interrup-
ted (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 route
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 assembly actuation – Short circuit/short to earth in cable harness for the gas valve as-
sembly
– Gas valve assembly defective (coils shorted to earth)
– Electronics defective
F.62 Fault: Gas valve assembly switch-off delay – Delayed shutdown of gas valve assembly
– Delayed extinguishing of flame signal
– Gas valve assembly 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
route blocked, incorrect gas injector, ionisation flow interruption (cable,
electrode), flue gas recirculation, condensate route
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 coding resistor
F.71 Flow temperature sensor fault Flow temperature sensor signalling constant value:
– Flow temperature sensor incorrectly positioned on the flow pipe
– Flow temperature sensor defective
F.72 Flow and/or return temperature sensor 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
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