Red Indicator Lamp "Failure; Electrical Operation - Option - 230 / 240 V, 850 W (3.7 A); Maintenance; Fuses - Truma B 10 Operating Instructions Manual

Drain the water heater if there is a risk of frost! There
shall be no claim under guarantee if this point is not
observed.

Red indicator lamp "failure"

The red indictor lamp (a) lights up if there is a failure. For possi-
ble causes please refer to page 5 – "Fault finding". To unlock,
switch off the appliance, wait 10 minutes, and switch on again.
Electrical operation – option –
230 / 240 V, 850 W (3.7 A)
To operate the electric heating element, please insert the plug
into the socket and then turn it on with the switch.
The electric heating element is operational when you can see
the mark on the switch (g).
Fig. 5
Never operate the water heater without water in it!
The water temperature cannot be selected, automatic
temperature limitation at approx. 70 °C! For a faster
heating up period the appliance can be simultaneously oper-
ated with gas and electrical power.

Maintenance

Materials in the device which come into contact with
water are suitable for use with drinking water (see
manufacturer declaration: www.truma.com – Manufacturer
Declaration).
Use wine vinegar for de-scaling the water heater, this being
introduced into the appliance via the water supply. Allow the
product to react and then thoroughly flush out the appliance
with plenty of fresh water. To sterilise the water we recom-
mend "Certisil-Argento". Other products, particularly those
containing chlorine are unsuitable.
In order to avoid the colonization of micro-organisms, heat up
the Boiler to 70 °C at regular intervals.

Fuses

The water heater 12 V fuse is on the electronic control unit on
the water heater.
Important note
Only replace the miniature fuse
on the p.c.b. with a fuse of the
same type: 1.6 A (slow action)
.
Fig. 6
If there is a defect in the electronics, return the control p.c.b.
well padded. If you fail to pack it correctly the guarantee shall
no longer be valid.
Only use original Truma Boiler control p.c.b.'s as spare parts!

Fault finding

Gas operation
Symptom
When switching on, the heat-
er does not operate.
Check the power supply (operation voltage min. 10.5 V).
Check the Boiler fuse (refer to maintenance "Fuses").
When switching on, the heat-
er does not operate and the
red lamp lights up
after approx. 30 secs.
Remove cowl cover and / or clear any obstruction.
Check gas valves and gas bottle.
To unlock (and purge air), switch off the appliance, wait
5 minutes, and switch on again.
Heater operates for a pro-
longed time and then
the red lamp lights up.
Check water content, refill if required (close drain valve).
To unlock, switch off the appliance, wait 5 minutes, and
switch on again.
Electrical operation
Symptom
When switching on, the
heater does not operate.
Connect the caravan to the site supply and / or check residual
current circuit breaker.
Check water content, refill if required (close drain valve).
The electrical heating element is fitted with an excess tem-
perature cut-out. In event of a fault, switch off at the control
panel, wait 10 minutes, then switch on again.
Water supply
Symptom
Water drips from the
safety valve.
Check water pressure (max. 400 kPa), use a pressure reduc-
er when connected to central water supply.
When opening the cold
water tap, hot water
comes out.
Fit a non-return valve in the cold water supply (refer to instal-
lation instructions "Water connection").
If fault persists please contact the nearest Dometic
Service.
Cause
– No 12 V supply voltage.
– Cowl cover fitted.
– Air in the gas supply.
– No gas supply.
– Incorrect gas pressure.
– Over temperature
thermostat operated.
Cause
– No 240 V supply voltage.
– Over temperature
thermostat operated.
Cause
– Water pressure to high
– Hot water flows back
through the cold water
supply.
5