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0020193966_04 ecoTEC exclusive Installation and maintenance instructions
53
Code
Parameter
Possible causes
F.35
Fault: Air/flue gas duct
Check the entire air/flue pipe for:
–
Permitted design
–
Restriction or blockage in the air/flue pipe caused by obstructions
–
Damage
The air/flue pipe must be installed in accordance with the recognised
rules
If the combustion air supply (air pipe) or discharge of flue gas (flue pipe)
occurs with no problems, reset the product using
and start it up
If
F.35
occurs again after start-up and the air/flue pipe is present and
correct, the function for checking the air/flue pipe can be deactivated via
D.145
If the function is deactivated via
D.145
, any faults can be cleared in the
product
and it can be started up
Note
D.145
can be used to permanently activate or deactivate the function
After the function is deactivated, the product no longer automatically
checks whether there are restrictions for the air/flue pipe.
F.42
Fault: Coding resistor
Gas family coding resistor short circuit/interruption (on the PCB)
–
Gas family coding resistor missing
–
The coding resistor does not match the gas type selection under
D.087
Incorrect coding resistor or incorrect gas type selected
F.49
Fault: eBUS
Short circuit on eBUS, eBUS overload or two power supplies with differ-
ent polarities on the eBUS
F.55
Fault: CO sensor
Checking the cable harness
All-gas sensor defective, replace the all-gas sensor
Electronics defective, replace the PCB
F.56
Safety switch-off: CO limit exceeded
Safety shutdown: CO limit value exceeded
A component in the combustion regulation is defective
–
Contact fault at the gas valve assembly (plug not plugged in cor-
rectly or not plugged in, plug defective, slot is defective (loose con-
nection))
–
If the fault occurs again after being reset: The gas valve assembly is
defective
F.57
Fault: Measuring program
Active comfort protection mode has detected a regulation fault
–
Ignition electrode highly corroded
F.61
Fault: Fuel valve actuation
The gas valve assembly cannot be actuated
–
Cable harness supply line to the gas valve assembly is defective
(short to earth, short circuit)
–
Gas valve assembly defective
–
PCB defective
F.62
Fault: Fuel valve switch-off delay
Delayed switch-off sequence of gas valve assembly detected
–
Flame indicator light (ignition and monitoring electrode indicates
delayed extinguishing of the flame signal)
–
Gas valve assembly defective
–
PCB defective
F.63
Fault: EEPROM
Electronics defective
F.64
Fault: Electronics/sensor
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: Flame signal unstable
Air in gas, gas flow pressure too low, incorrect air ratio, condensate
route blocked, ionisation flow interruption (cable, electrode), flue gas
recirculation, condensate route
F.70
Fault: Invalid Device Specific Number
If spare parts fitted: Display and PCB replaced at same time and DSN
not reset, incorrect or missing output coding resistor
F.71
Fault: Flow sensor
Flow temperature sensor signalling constant value:
–
Flow temperature sensor incorrectly positioned on the flow pipe
–
Flow temperature sensor defective