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7 | Troubleshooting
See also: chapter 8, "Disposal" on page 17.
6.3
Bolt check
Check the four bolts holding the unit to the roof for tightness 3
months after first installation of the product.
Inspect the bolts regularly; minimally every 12 months.
Retighten to 11 Nm if necessary.
6.4
Regular usage
Webasto recommends that you operate air conditioner regularly
to ensure good performance. Minimally run the unit every 6
months for at least for 20 - 30 minutes.
6.5
Cleaning
Regularly remove leaves or other dirt from the ventilation grilles
of the outdoor unit.
l Regularly clean the unit using a soft, damp cloth and mild
detergent.
l Clean the vehicle roof at regular intervals. A dirty roof heats
up more than a clean roof.
CAUTION
Never drive through automatic car washes with a roof
air conditioner installed.
Do not spray into the openings of the unit with a high-
pressure cleaner.
Do not use hot cleaners and steam cleaners.
Do not use sharp or hard objects for cleaning.
Never use petrol, diesel, solvents or aggressive cleaning
agents.
6.6
Heat exchangers
Minimally have your unit's heat exchangers cleaned by a spe-
cialist workshop once per year.
7
Troubleshooting
Symptom
Action
No air distrib-
Check if:
utor display
l Power is supplied to the vehicle and circuit
when the unit
breakers are on.
is turned ON.
l The remote control battery is OK.
l The remote control is off.
l The voltage is too low.
l The amperage of the circuit breaker in the
external power supply is too low.
Cooling not
Check that the cooling mode is selected and
available.
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
Check that heating mode is selected and the
available.
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.
16 / 136
Symptom
Action
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
Make sure the filter is clean.
capacity.
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
Unblock condensate outlets of outdoor unit.
out of the air
Check the adaptor frame seal.
distributor.
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:
l Insufficient refrigerant amount due to pip-
ing fracture.
l Compressor fault.
l Sensor 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
68°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.)
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.
9042924A OI-II CTT 28
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