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Trouble-shooting list
Fault Cause Rectification
After switching on none of
the LEDs are lit.
No operating voltage.
Device fuse or vehicle fuse
defective.
Check 12 V / 24 V battery voltage, charge if necessary.
Check all electrical plug connections.
Check the unit or vehicle fuse and replace if necessary
(see fuses).
The green LED comes on
when the unit is switched
on but the heater does not
operate.
The temperature setting on
the control panel is lower
than the room temperature.
Select higher room temperature at the control panel.
Red LED flashes 1 x per sec.
Red LED flashes 3 x per sec.
Open window above cowl
(window switch).
– Under-voltage range
12 V: 10.9 V – 10.5 V.
24 V: 21.8 V – 20.7 V
– Over-voltage range
12 V: 15.8 V – 16.4 V.
24 V: 31.8 V – 33.1 V
– Close window.
– Charge battery!
Check the battery voltage and power supply such as e.g.
the charging device.
Approximately 30 seconds
after the heater is switched
on, the red LED is lit.
Valves in the gas supply line
closed.
Combustion air infeed or
exhaust outlet is sealed.
Check gas supply and open valves.
Remove cowl cap.
Inspect openings for contamination (slush, ice, leaves, etc.)
and remove contamination if necessary.
After operating for a longer
period of time, the heater
switches to failure.
Hot-air outlets blocked.
– Recirculated air intake
blocked.
Check individual outlet apertures.
Remove blockage from recirculated air intake.
If these measures do not remove the failure, please contact the Truma Service Centre.
16


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