Operation Manual

16
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.