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Appendix
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
F.00 Interruption: Flow sensor
F.10 Short circuit: Flow
sensor
F.13 Short circuit: Cylinder
sensor
F.20 Safety switch-off: Tem-
perature limiter
F.22 Safety switch-off: Low
water pressure
F.27 Safety switch-off: Flame
simulation
F.28 Start-up failure: Ignit.
unsuccessful
F.29 Operating failure: Ignit.
unsuccessful
F.32 Fault: Fan
F.37 Fault: Dev. in fan speed
F.42 Fault: Coding resistor
F.43 Interruption: Coding res-
istor
F.49 Fault: eBUS
F.50 Fault: Flue gas pressure
switch
F.61 Fault: Fuel valve actu-
ation
F.62 Fault: Fuel valve switch-
off delay
F.63 Fault: EEPROM
F.64 Fault: Electronics/sensor
F.65 Fault: Electronics temp.
F.67 Fault: Electronics/flame
32
Possible cause
Flow temperature sensor de-
fective or not connected
Flow temperature sensor de-
fective or has short-circuited
Warm start sensor/cylinder tem-
perature sensor defective or not
connected
Maximum temperature at the
flow/return temperature sensor
is too high when the safety cut-
out function is operating using
the NTC
No/insufficient water in the
product or the water pressure is
too low
Monitoring electrode reports an
incorrect flame
Failure during start-up or igni-
tion unsuccessful. Gas pressure
monitor or thermal cut-out has
been triggered.
Gas supply interrupted intermit-
tently. Re-ignition failed.
Fan defective or not connected
Fan speed does not correspond
to the target value
Coding resistor or gas group
resistor causes a short circuit
Coding resistor or gas group
resistor defective or not connec-
ted
Undervoltage on the eBUS
Flue pressure switch has been
triggered
The gas valve assembly cannot
be actuated
Delayed switch-off sequence for
the gas valve after the flame is
extinguished
EEPROM faulty
Electronics, safety-relevant
sensor or cable defective
Electronics defective or too hot
due to external influences
Implausible flame signal
Installation and maintenance instructions ecoVIT exclusiv 0020258610_00
Measure
▶
Check: Flow temperature sensor, plug, cable harness, PCB.
▶
Check: NTC plug, cable harness, cable/housing, PCB, NTC
sensor.
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.
▶
Check: Flow temperature sensor (correct thermal connection),
cable harness, sufficient purging.
1.
Check: Plug, cable to heating pump or water pressure
sensor, water pressure sensor, heating pump.
2.
Activate and purge check programme P.0.
▶
Check: Gas pressure at upper test opening, monitoring elec-
trode, PCB, gas solenoid valve.
▶
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, CO₂ setting.
▶
Check: Flue gas recirculation, condensate route (blockage),
earthing, cable to the gas valve assembly and electrode (loose
connection).
▶
Check: Plug, cable harness, fan (blockage, function, correct
speed), Hall sensor, PCB, flue gas route (blockage).
▶
Check: Plug, cable harness, pressure switch, fan, PCB.
▶
Check: Plug, earth connection, cable, output coding resistor (in
the cable harness).
▶
Check: Plug, cable harness, output coding resistor (in the
cable harness), PCB.
▶
Check: eBUS (overload, two power supplies with different po-
larities, short circuit).
▶
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).
▶
Check: Cable harness, plug, gas valve assembly (rinse), PCB.
▶
Check: Gas valve, surface of the burner (dirt), plug, cable har-
ness, PCB.
▶
Replace: PCB.
▶
Check: Flow sensor, cable to the sensor, flame recording
sensor (e.g. ionisation electrode) for an unstable signal,
electronics.
1.
Check: PCB.
2.
If required, reduce the environmental temperature.
▶
Check: Cable harness, flame monitor, PCB.
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Table of Contents
Troubleshooting
