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Troubleshooting guide (Combi Diesel heating system)
Flashing code in analogue control panel – CP Classic
Flash sequence LED:
– On / Off: 0.5 seconds
Pause between flash sequence: 5 seconds
Fault Cause Rectification
No LED illuminates
after switching on.
– No operating voltage
– Device fuse or vehicle fuse
defective
– Check 12 V battery voltage, charge battery if necessary
– Check all electrical plug connections
– Check fuse of unit or vehicle, replace if necessary (see fuses)
The green LED illuminates when
the unit is switched on, but the
heating system does not operate
– The temperature setting on the
control panel is lower than the
room temperature
– Select higher room temperature at the control panel
Green LED flashes (with 5 Hz)
after the heating system has been
switched off
– After-running is active to reduce
the temperature of the unit
– No fault, after-run switches itself off after max. 5 minutes
Red LED flashes 6 x – Lack of fuel due to insufficient
fuel tank filling, tank has run
empty and / or vehicle is on a
slope
– Fill tank with fuel, then fill fuel line as described in "Initial start-up"
Red LED flashes (except 6 times)
or red LED permanently on
– Heater malfunction – Please contact Truma Service
Yellow LED flashes 1 x – Risk of low voltage
< 11.5 V
– Use the electrical power from the battery sparingly,
e.g. restrict lighting
– Charge battery
Yellow LED flashes 2 x – Undervoltage < 10.2 V – Check battery voltage, charge battery if necessary
– Short-term immediate action, switch off major consumers
or start up vehicle engine until the heating system starts running
(approx. 4 minutes)
– Battery capacity inadequate, if necessary exchange old battery
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