Appendix
32
Installation and maintenance instructions ecoVIT exclusiv 0020258610_00
E
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.
Message
Possible cause
Measure
F.00 Interruption: Flow sensor
Flow temperature sensor de-
fective or not connected
▶
Check: Flow temperature sensor, plug, cable harness, PCB.
F.10 Short circuit: Flow
sensor
Flow temperature sensor de-
fective or has short-circuited
▶
Check: NTC plug, cable harness, cable/housing, PCB, NTC
sensor.
F.13 Short circuit: Cylinder
sensor
Warm start sensor/cylinder tem-
perature sensor defective or not
connected
1.
Check: NTC plug, earth connection, cable harness, NTC
sensor, PCB.
2.
Check the following on the shift-load cylinder (in conjunction
with F.91): NTC plug, earth connection, cable harness, NTC
sensor, connection to the PCB.
F.20 Safety switch-off: Tem-
perature limiter
Maximum temperature at the
flow/return temperature sensor
is too high when the safety cut-
out function is operating using
the NTC
▶
Check: Flow temperature sensor (correct thermal connection),
cable harness, sufficient purging.
F.22 Safety switch-off: Low
water pressure
No/insufficient water in the
product or the water pressure is
too low
1.
Check: Plug, cable to heating pump or water pressure
sensor, water pressure sensor, heating pump.
2.
Activate and purge check programme P.0.
F.27 Safety switch-off: Flame
simulation
Monitoring electrode reports an
incorrect flame
▶
Check: Gas pressure at upper test opening, monitoring elec-
trode, PCB, gas solenoid valve.
F.28 Start-up failure: Ignit.
unsuccessful
Failure during start-up or igni-
tion unsuccessful. Gas pressure
monitor or thermal cut-out has
been triggered.
▶
Check: Gas stopcock, gas flow pressure, gas valve assembly,
air intake pipe (blockage, loosened screw), condensate route
(blockage), multiple plug, cable harness, ignition transformer,
ignition cable, ignition plug, ignition electrode, monitoring elec-
trode, electronics, earthing, CO
₂
setting.
F.29 Operating failure: Ignit.
unsuccessful
Gas supply interrupted intermit-
tently. Re-ignition failed.
▶
Check: Flue gas recirculation, condensate route (blockage),
earthing, cable to the gas valve assembly and electrode (loose
connection).
F.32 Fault: Fan
Fan defective or not connected
▶
Check: Plug, cable harness, fan (blockage, function, correct
speed), Hall sensor, PCB, flue gas route (blockage).
F.37 Fault: Dev. in fan speed
Fan speed does not correspond
to the target value
▶
Check: Plug, cable harness, pressure switch, fan, PCB.
F.42 Fault: Coding resistor
Coding resistor or gas group
resistor causes a short circuit
▶
Check: Plug, earth connection, cable, output coding resistor (in
the cable harness).
F.43 Interruption: Coding res-
istor
Coding resistor or gas group
resistor defective or not connec-
ted
▶
Check: Plug, cable harness, output coding resistor (in the
cable harness), PCB.
F.49 Fault: eBUS
Undervoltage on the eBUS
▶
Check: eBUS (overload, two power supplies with different po-
larities, short circuit).
F.50 Fault: Flue gas pressure
switch
Flue pressure switch has been
triggered
▶
Check: Condensate hose (too long, kinks, downward gradient
too shallow, condensate pump defective), neutralisation device
(dirt, blockage, downward gradient too shallow), flue gas col-
lector (blockage, vent hole), burner (excessive start-up pres-
sure, pulsing), flue gas route (blockage, too long, too many
elbows), flue gas safety cut-out (cable, plug).
F.61 Fault: Fuel valve actu-
ation
The gas valve assembly cannot
be actuated
▶
Check: Cable harness, plug, gas valve assembly (rinse), PCB.
F.62 Fault: Fuel valve switch-
off delay
Delayed switch-off sequence for
the gas valve after the flame is
extinguished
▶
Check: Gas valve, surface of the burner (dirt), plug, cable har-
ness, PCB.
F.63 Fault: EEPROM
EEPROM faulty
▶
Replace: PCB.
F.64 Fault: Electronics/sensor
Electronics, safety-relevant
sensor or cable defective
▶
Check: Flow sensor, cable to the sensor, flame recording
sensor (e.g. ionisation electrode) for an unstable signal,
electronics.
F.65 Fault: Electronics temp.
Electronics defective or too hot
due to external influences
1.
Check: PCB.
2.
If required, reduce the environmental temperature.
F.67 Fault: Electronics/flame
Implausible flame signal
▶
Check: Cable harness, flame monitor, PCB.
