Technical data

45Installation and maintenance instructions ecoTEC exclusive 0020017768_05
9.1.3 Error codes
The error codes displace all other displays when errors
occur.
If many errors occur simultaneously, the relevant error
codes are displayed alternately for approx. 2 seconds
each.
9.1.4 Error memory
The last ten errors are saved in the appliance error
memory.
• Press the "i" and "-" buttons simultaneously.
• Scroll back in the error memory with the "+" button.
Code Meaning Cause
F.0 Interruption feed temperature sensor (NTC):
NTC faulty, NTC cable faulty, faulty plug connection on NTC,
faulty plug connection on the electronics
F.1 Interruption return temperature sensor (NTC):
NTC faulty, NTC cable faulty, faulty plug connection on NTC,
faulty plug connection on the electronics
F.10 Short-circuit in feed temperature sensor
Sensor plug has mass short to the casing, short-circuit in
wiring loom, sensor faulty
F.11 Short-circuit in return temperature sensor
Sensor plug has mass short to the casing, short-circuit in
wiring loom, sensor faulty
F.13 Short-circuit on heat retention storage tank sensor
Sensor plug has mass short to the casing, short-circuit in
wiring loom, sensor faulty
F.20 Safety temperature limiter actuated
Flow probe not connected thermally correct or defective,
appliance does not shut down
F.22 Dry fire
Too little water in the appliance, water shortage switch defective,
cable to pump or water shortage switch defective, pump blocked
or defective, pump output too low
F.23
Water shortage, temperature spread between
flow and return probe too large
Pump blocked or defective, pump output too low, flow and return
sensor swapped over
F.24 Water shortage, temperature rise too quick
Pump blocked, low output from the pump, air in appliance, system
pressure too low
F.25 Interruption in cable harness Cable harness faulty
F.27 External light: Gas solenoid valve defective, flame detector defective
F.28
Appliance does not start: Attempts to ignite
during start failed
Faults in the gas supply such as:
- Gas meter or gas pressure detector defective
- Air in gas
- Gas flow pressure too low
- Main gas cock closed
Faults in the gas fitting, wrong gas setting, igniter (ignition
transformer, ignition cable, ignition plug) defective, ionisation
current stopped (cable, electrode), faulty earthing in appliance,
electronics defective
F.29
Flame goes off during operation and subsequent
ignition attempts failed
Gas supply temporarily stopped, ignition transformer has spark
failure, faulty earthing of appliance
F.32 Speed deviation Fan
Fans blocked, plug not inserted correctly on fan, hall sensor
defective, fault in cable harness, electronics defective
F.49 eBUS undervoltage
Short-circuit on eBUS input, eBUS overload or two power
supplies with different polarities on the eBUS
F.61 Gas valve control faulty
Short-circuit to mass in cable harness to the gas valves,
installation fault on gas valve (short-circuit, mass short in the coils)
electronics faulty
F.62 Gas valve shutoff delay defective Gas fitting leaking, electronics defective
F.63 EEPROM faulty Electronics defective
F.64 Electronics/sensor fault Short-circuit in flow or return sensor or electronics defective
F.65 Electronics temperature too high Electronics too hot due to external effect, electronics defective
F.67 Flame monitor input signal is outside the limits (0 or 5 V) electronics defective
F.70 No valid appliance variant for display and/or electronics
Spare part case: Display and electronics changed at the same
time appliance variant not re-set
Table 9.4 Error codes
You can exit the error memory display as follows:
• Press the "i" button or
• Do not press any button for about 4 minutes.
The current heating flow temperature appears in the
display again.
Troubleshooting 9