34020-01171 · 00 · 01/2022
Cleaning and careCombi D
31EN
7 Cleaning and care
7.1 Cleaning the cowl outer part
To prevent adhesion of combustion residues, Truma rec-
ommends regular cleaning of the cowl outer part�
To clean it, use a soft sponge and a plastic cleaning
product for the outside area�
NOTICE
Damage to the heater caused by water in
the wall cowl
When cleaning the vehicle with a high-pres-
sure water blaster, avoid the area around the
wall cowl�
7.2 Cleaning the water container
If the water container is not used for long periods,
legionella and other microorganisms can breed in
standing water�
Regularly sterilise and descale the water container of
the heater� All cleaning products from camping special-
ists are suitable for cleaning, sterilisation and care�
We also recommend that you heat the water in the wa-
ter container to 70 °C regularly to prevent microorgan-
isms breeding�
Select “Diesel” mode�
Set water temperature to 60 °C�
Switch on device�
Once the water in the water container has reached a
temperature of 60 °C, the burner will switch off� Leave
the appliance switched on for at least 30 minutes and
do not draw any hot water� The residual heat in the
heat exchanger will heat the water up to 70 °C�
To descale the water container, use commercial descal-
ing products, vinegar essence or citric acid�
Fill the water container with cleaning or descaling prod-
ucts in the correct mixing ratio via the water inlet and
allow them to work�
Then rinse the water container thoroughly with clean
water�
8 Maintenance and servicing
If the Combi D is filled with water, heat it at least
once per month for approx� 30 min� (see “Cleaning
the water container”)�
The safety / drain valve ( FrostControl) must be op-
erated regularly (at least twice annually) to remove
limescale deposits and to be certain that it is not
blocked�
8.1 Fuses
8.1.1 Fuses 12 V
DANGER
Risk of fire from short circuit
In the event of a short circuit in the 12 volt pow-
er supply, very high currents can flow and cause
cable fires�
Replace fuses only with the battery
disconnected
DANGER
Risk of fire if an
unsuitable fuse is used
May be replaced only with a Truma original
part (part number 34020-01331)
The fuses (Fig� 11-3) are located on the electronics
(Fig� 11-2) beneath the connector cover (Fig� 11-1)�
Disconnect all poles from the battery�
Remove the connector cover�
Replace the fuses�
Replace faulty fuses only with Truma original parts�
Replace the connector cover�
Reconnect the battery�
1
3
2
3
Fig� 11
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