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Appendix
D
Overview of fault codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
If faults occur, some of them can be reset. To do so, press and hold the
Fault code
Meaning
F.00
Fault: Flow temperature sensor
F.01
Fault: Return temperature sensor
F.10
Short circuit: Flow temperature sensor
F.11
Short circuit: Return temperature sensor
F.13
Short circuit: Domestic hot water cylinder
temperature sensor
F.20
Safety shutdown: Overheating temperat-
ure reached
F.22 / 0,0
Safety shutdown: Low water pressure in
bar
the boiler
F.23
Safety shutdown: Temperature spread
too great (NTC1/NTC2)
F.24
Safety shutdown: Temperature rise too
fast
F.27
Safety shutdown: Fault in flame detec-
tion
F.28
Fault: Ignition unsuccessful when starting
up
F.29
Fault: Flame loss
F.32
Fan test function active: Fan speed
outside the tolerance values
F.46
Short circuit: Temperature sensor at the
solar circuit water inlet
F.49
eBUS fault: Voltage too low
F.61
Fault: Gas valve assembly control sys-
tem
F.62
Fault: Gas valve switch-off control
F.63
Fault: EEPROM
F.64
Fault: Electronics/sensor/analogue-to-
digital converter
F.65
Fault: Electronics temperature too high
F.67
Value sent back by ASIC is incorrect
(flame signal)
F.68
Fault: Unstable flame (analogue input)
F.70
Invalid product code (DSN)
38
Possible cause
NTC plug not plugged in or has come loose, multiple plug on the PCB not
plugged in correctly, interruption in cable harness, NTC sensor defective
NTC plug not plugged in or has come loose, multiple plug on the PCB not
plugged in correctly, interruption in cable harness, NTC sensor defective
NTC sensor defective, short circuit in the cable harness, cable/housing
NTC sensor defective, short circuit in the cable harness, cable/housing
Applies to: Product with heating mode only
NTC sensor defective, short circuit in the cable harness, cable/housing
Overheating temperature reached; check whether water is available and
whether the flow rate is sufficient.
Incorrect earth connection between cable harness and product, flow or return
NTC defective (loose connection), stray spark via ignition cable, ignition plug
or ignition electrode
No water or insufficient water in the product, water pressure sensor defect-
ive, cable to water pressure sensor loose/not connected/defective
Pump blocked, insufficient pump output, air in product, flow and return NTC
sensors connected the wrong way round
Pump blocked, insufficient pump output, air in product, system pressure too
low, non-return valve blocked/incorrectly installed
Moisture on the electronics, electronics (flame monitor) defective, gas solen-
oid valve leaking
Gas meter defective or gas pressure monitor has triggered, air in gas, gas
flow pressure too low, thermal isolator device (TAE) has triggered, incorrect
gas injector, incorrect spare gas valve assembly, fault on the gas valve as-
sembly, multiple plug on PCB incorrectly plugged in, break in cable harness,
ignition system (ignition transformer, ignition cable, ignition plug, ignition
electrode) defective, ionisation flow interrupted (cable, electrode), incorrect
earthing of product, electronics defective
Gas supply temporarily stopped, flue gas recirculation, incorrect earthing of
product, ignition transformer has spark failure
Plug on fan not correctly plugged in, multiple plug on PCB not correctly
plugged in, break in cable harness, fan blocked, Hall sensor defective, elec-
tronics defective
Applies to: Installed solar set (optional)
Sensor defective, short circuit in the cable harness, cable/housing
Short circuit on the eBUS, eBUS overload or two power supplies with differ-
ent polarities on the eBUS (can only be found in the fault report)
Short circuit/short to earth in cable harness for the gas valve assembly, gas
valve defective assembly (coils shorted to earth), electronics defective
Delayed switch-off of gas valve assembly, delayed extinguishing of flame
signal, gas valve assembly leaking, electronics defective
Electronics defective
Flow or return NTC short circuited, electronics defective
Electronics overheating due to external influences, electronics defective
Implausible flame signal, electronics defective
Air in gas, gas flow pressure too low, incorrect air ratio, incorrect gas in-
jector, ionisation flow interruption (cable, electrode)
Electronics defective
Replace the screen and PCB at the same time without reconfiguring the
product's Device Specific Number
Installation and maintenance instructions ecoTEC pure 0020258016_00
button for three seconds.
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