Vaillant ecoTEC plus Installation And Maintenance Instructions Manual page 58

Message
F.22 Safety switch-off: Low wa-
ter pressure
F.23 Safety switch-off:
Temp.spread too large
F.24 Safety switch-off: Temp.
incr. too fast
F.25 Safety switch-off: Flue
temp. too high
F.26 Fault: Fuel valve not work-
ing
F.27 Safety switch-off: Flame
simulation
F.28 Start-up failure: Ignit. un-
successful
F.29 Operating failure: Ignit.
unsuccessful
F.32 Fault: Fan
F.42 Fault: Coding resistor
F.49 Fault: eBUS
F.52 Mass flow sensor not con-
nected
F.53 Fault: Mass flow sensor
F.54 Fault: Boiler start
F.55 Fault: CO sensor
F.56 Safety switch-off: CO limit
exceeded
F.57 Fault: Measuring program
F.61 Fault: Fuel valve actuation
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
58
Possible cause
No/insufficient water in the
product or the water pressure is
too low
Temperature spread too great.
Water circulation too low
Temperature increase too fast
flue gas temperature too high
Gas valve assembly stepper
motor defective or not connec-
ted
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
Coding resistor or gas group
resistor causes a short circuit
Undervoltage on the eBUS
Mass flow sensor defective or
not connected
Mass flow sensor defective
No gas inlet pressure or insuffi-
cient gas inlet pressure causes
faults when the product is star-
ted
All-gas sensor defective or has
short-circuited
Safety shutdown after the CO
limit value is exceeded
Regulation fault caused by cor-
roded ignition electrode
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
Measure
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: Plug, cable to heating pump/water pressure sensor,
air/insufficient water in the heating circuit, flow and return tem-
perature sensor inverted, strainer in the hydraulic block, water
pressure sensor, heating pump (sufficient circulation, level 2:
D.19, D.14, non-return valve). Activate check programme P.0.
▶
Check: Plug, cable to the heating pump, air/insufficient water
in the heating circuit, internal air vent (function), heating pump
(system pressure too low, temperature gradient too great on
heating flow, non-return valve). Activate check programme P.0.
▶
Check: Plug, safety cut-out plug, cable harness, cable to the
heating pump, internal air vent (function), flue gas route (block-
age, adverse wind conditions, flue pipework too long), insuf-
ficient water in heating circuit, heating pump, activate check
programme P.0.
▶
Check: Gas valve assembly stepper motor (plug, cable, pas-
sage for rinsing, voltage), multiple plug, cable harness.
▶
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, earth connection, cable, output coding resistor (in
the cable harness).
▶
Check: eBUS (overload, two power supplies with different po-
larities, short circuit).
▶
Check: Plug, cable harness, mass flow sensor.
▶
Check: Filter below Venturi filter cap wet or blocked, gas flow
pressure too low, internal pressure measuring point in the Ven-
turi is blocked (do not use any lubricants on the O-ring in the
Venturi).
▶
Check (in conjunction with F.28/F.29): Gas stopcock, gas valve
assembly, plug, cable harness.
▶
Check: Plug, cable harness, all-gas sensor, PCB.
▶
Check: Gas valve assembly, plug, cable harness. If the fault
occurs again after being cleared, the gas valve assembly is
defective.
▶
Check: Ignition electrode, PCB (microcontrol).
▶
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.
Installation and maintenance instructions ecoTEC plus 0020244998_04