Troubleshooting
62 Installation and maintenance instructions ecoTEC 0020173113_01
13
13.2.9 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.20 Safety switch-off: temperature limiter Incorrect earth connection between cable harness and boiler, flow or
return NTC defective (loose connection), black discharge via ignition
cable, ignition plug or ignition electrode
F.22 Safety switch-off: low water pressure No water pressure, or water pressure is too low in the boiler, water pres-
sure 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 boiler, flow and return
NTC interchanged
F.24 Safety switch-off: Temperature rise too fast Pump blocked, poor pump performance, air in boiler, system pressure
too low, non-return valve blocks/incorrectly installed
F.25 Safety switch-off: Flue gas temperature too high Break in plug connection for optional flue gas safety thermostat (STB),
break in cable harness
F.26 Fault: Gas valve without function Gas valve stepper motor not connected, multiple plug on the PCB not
plugged in correctly, interruption in cable harness, gas valve stepper
motor defective, electronics defective
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 regulator has triggered, air in gas,
gas flow pressure too low, thermal isolator device (TAE) has triggered,
condensate duct blocked, incorrect gas restrictor, incorrect ET 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 boiler, electronics defective
F.29 Failure during operation: Re-ignition unsuccessful Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, faulty earthing of boiler, ignition transformer has spark failure
F.32 Fan fault Plug at 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 eBUS fault 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 EEPROM error Electronics defective
F.64 Electronics/NTC fault Supply or return NTC short circuited, electronics defective
F.65 Electronic temperature fault Electronics overheating due to external influences, electronics defective
F.67 Electronics/flame fault Implausible flame signal, electronics defective
13.2 Fault codes
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