Trouble-Shooting List - Truma Combi 4 Operating Instructions Manual

Trouble-shooting list

Fault
No LED is shining, the device is
switched on and is supplied with
operating current.
After switching on (winter and sum-
mer 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 switching on the heating system,
the green LED shines and
– the red LED flashes with 5 Hz,
– the red LED flashes with 1 Hz,
– the red and the yellow LEDs flash
alternately with 1 Hz.
After the heater is switched on, the
green LED is lit and the red LED blinks.
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 flash (with 5 Hz)
after the heating system has been
switched off.
Green LED flashes (with 5 Hz)
after the heating system has been
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
Cause
– Automatic restart is blocked,
e.g. after a power failure.
– 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).
– Under-voltage.
Battery voltage is too low
< 10.0 V.
– Threatening under-voltage.
Battery voltage is too low
< 10.4 V.
– There is a threat of under-
voltage when heating up
the water.
Battery voltage is too low
< 10.4 V.
– Electronics are defective.
– Gas cylinder or quick-closure
valve in the gas line is closed.
– Combustion air infeed or ex-
haust 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 during
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
– Reset (fault reset) by switching off, waiting 5 seconds and
then switching on again.
– 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. If necessary replace old battery.
– Charge battery.
– 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.