Trouble-Shooting List; Water Supply - Truma Combi 4 Mode D'emploi

Trouble-shooting list

Fault
After switching on (winter
and summer operation) none
of the LEDs are lit.
The green LED comes on
when the unit is switched
on but the heater does not
operate.
After the heater is switched
on, the green LED is lit and
the red LED blinks.
After the heater is switched
on, the green and the red
LEDs are lit.
Approximately 30 seconds
after the heater is switched
on, the red LED is lit.
After operating for a longer
period of time, the heater
switches to failure.
Green and red LEDs blink
after heater is switched off.
Green LED blinks after heater
is switched off.

Water supply

After the heater is switched
off, the drain valve opens
(FrostControl).
The drain valve (FrostControl)
can no longer be closed.
Water flows intermittently
from the FrostControl drain
muff.
If these measures do not remove the failure, please contact the Truma Service Centre.
14 14
Cause
– No operating voltage.
– Device fuse or vehicle fuse
defective.
– The temperature setting
on the control panel is
lower than the room
temperature.
– Open window above cowl
(window switch).
– Battery voltage is too low
< 10.5 V.
– Electronics are defective.
– Gas cylinder or quick-clo-
sure valve in the gas line is
closed.
– Combustion air infeed or
exhaust outlet is sealed.
– Summer operation with
empty water tank.
– Hot-air outlets blocked.
– Recirculated air intake
blocked.
– Gas pressure regulator iced
up.
– Butane content in the gas
cylinder too high.
– Unit was switched off dur-
ing failure. After-running
is active in order to reduce
the unit's temperature.
– After-running is active in
order to reduce the unit's
temperature.
– Temperature at drain valve
less than approx. 3° C.
– Temperature at drain valve
is below approximately
7° C.
– Rotary switch is not at
"Operation".
– Water pressure too high.
Rectification
– Check 12 V battery voltage, charge if necessary.
– Check all electrical plug connections.
– Check the unit or vehicle fuse and replace if necessary
(see fuses).
– Select higher room temperature at the control panel.
– Close window.
– Charge battery.
– Please contact the Truma Service Centre.
– Check gas supply and open valves.
– Inspect openings for contamination (slush, ice, leaves, etc.)
and remove contamination if necessary.
– Switch device off and allow to cool. Fill boiler with water.
– Check individual outlet apertures.
– Remove blockage from recirculated air intake.
– Use regulator heating (EisEx).
– Use propane (at temperatures below 10° C in particular,
butane is unsuitable for heating purposes).
– After-running will switch off after a few minutes. Only at
that time will a failure reset be possible (switch off and then
back on).
– No failure. After-running will switch off after approximately
5 minutes.
– Switch the heater on. If the temperature is below approxi-
mately 3° C, the drain valve will open automatically! If the
heater is not in operation, the drain valve can be reclosed
only when the temperature is approximately 7° C or higher!
– Use heating element for FrostControl.
– Switch the heater on. If the heater is not in operation, the
drain valve can be reclosed only when the temperature is
approximately 7° C or higher!
– Turn the drain valve's rotary switch to "Operation", then
press the push button until it engages.
– Check pump pressure (max. 2.8 bar). If connected to a
central water supply (rural or urban connection), a pressure
reducer must be used, which will prevent pressures higher
than 2.8 bar entering the boiler.