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Webasto Cool Top Trail 36V Manual

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7 | Troubleshooting
18 / 154 9044618A_OI-II_Cool Top Trail 36V
7 Troubleshooting
Symptom Action
No air distrib-
utor display
when the unit
is turned ON.
Check if:
lPower is supplied to the vehicle and circuit
breakers are on.
lThe remote control battery is OK.
lThe remote control is off.
lThe voltage is too low.
lThe amperage of the circuit breaker in the
external power supply is too low.
Cooling not
available.
Check that the cooling mode is selected and
the air distributor display shows:
Use the remote control to set required temper-
ature below the current room temperature.
The compressor will delay a re-start for 3
minutes.
Heating not
available.
Check that heating mode is selected and the
air distributor display shows:
Use the remote control to set required temper-
ature above the current room temperature.
More time would be needed for starting heat-
ing under extremely cold condition.
When the unit is in heating mode and the out-
side temperature is very low the unit may auto-
matically enter defrost mode. The heating will
temporarily stop as the unit warms the outside
heat exchanger to remove any frost & ice.
Heating will resume when the outside heat ex-
changer has been cleared. During defrost the
unit displays “dF”.
Poor cooling
capacity.
Make sure the filter is clean.
Increase the fan speed to high to obtain the
maximum capacity.
Make sure all the doors and windows as well
as the sunroof are closed.
Use curtains and awnings to decrease the heat
load.
Check that the air openings of outdoor unit are
not soiled or blocked.
Water dripping
out of the air
distributor.
Unblock condensate outlets of outdoor unit.
Check the adaptor frame seal.
Park the vehicle in a more horizontal position,
with an angle < 5° (8,8%).
Increase the fan speed to high if condensate
forms on the outside of the air distributor.
Fault codes on the panel:
- If there is “0” or a jumbled display while on
generator supply this may indicate unstable
voltage and current.
E0 Communication fault.
E1 Room temperature sensor fault.
E2 Indoor heat exchanger temperature sensor
fault.
E3 Outdoor heat exchanger temperature sensor
fault.
E4 No cooling effect. Possible root causes are:
Symptom Action
lInsufficient refrigerant amount due to pip-
ing fracture.
lCompressor fault.
lSensor failure.
E5 Outdoor heat exchanger temperature too
high / Temperature anomaly.
Temperature anomaly: outdoor heat exchanger
temperature too high when cooling or too low
when heating. (When cooling, the display of
E5 indicates the outdoor temperature exceeds
64°C. It is likely due to the reduction of air
flow of the condenser, poor working of the
condenser fan or sensor failure; when heating,
if the outdoor temperature is higher than
18°C, the external air fan may be on and off
repeatedly. The occurrence of this is not a
fault, but self-protection of the system to avoid
overheating of the unit.)
A1 Outdoor ambient temperature sensor fault
LC Motherboard and drive board communication
fault
A4 Compressor discharge temperature sensor fault
C4 Compressor discharge over-temperature pro-
tection
b1 Module protection
b2 Module hardware protection
b3 Module software protection
b5 Compressor over-current protection
b6 Overvoltage and undervoltage protection
b9 Module heat sink temperature shutdown pro-
tection
bA Compressor stall protection
dF Not a fault: When operating on heating mode
in low ambient temperatures the unit will peri-
odically defrost the outside heat exchanger.
The air distributor display shows “dF” during
defrost operation and then returns to heating
once the defrost is completed.
… 18 …


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