Trouble-Shooting List; Water Supply - Truma Combi 4 E Instrucciones De Uso

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 (by
means of the ZUCB time switch),
but the heater does not operate.
The green LED comes on when
the unit is switched on (by
means of the ZUCB time switch),
but the heater does not operate.
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 pe-
riod 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.
When the device is switched on
in electrical operation the red
LED on the control panel flashes,
the yellow LED on the power se-
lector switch does not illuminate
and the heater does not heat up.

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.
16
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-closure
valve in the gas line is closed.
– Combustion air infeed or
exhaust outlet is sealed.
– 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.
– No 230 V operating voltage.
– 230 V fuse defective.
– Overheating protection has
activated.
– 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 battery voltage (12 V).
– 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.
– 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 min-
utes. The heater can be switched back on at any time during the
after-running phase in winter operation (in summer operation only
after two minutes).
– Check 230 V operating voltage.
– Check 230 V fuse and replace if necessary.
– Reset overheating protection. Allow heater to cool, remove connec-
tion cover and press reset button.
– Switch the heater on. If the temperature is below approximately
3° C, the drain valve will open automatically! If the heater is not in
operation, the drain valve can be reclosed only when the tempera-
ture 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.