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Troubleshooting guide (Combi Diesel heating system)
Fault code Cause Rectification
# 111 Room temperature sensor or cable defective Please contact Truma Service.
# 122 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 startup”
(see Combi D operating instructions).
# 131 No connection between heating system and control
panel
Defective control panel cable
Please contact Truma Service.
# 132 FrostControl heating element has a short circuit Disconnect heating element plug from electronic control unit.
Replace heating element.
# 150
Warm air temperature exceeded:
Not all warm air ducts are connected
Warm air outlets blocked
Circulated air intake blocked
Check whether the 4 warm air ducts are connected
Check individual outlet apertures
Remove blockage from circulated air intake
# 151
Water temperature exceeded:
Summer mode with empty water tank
Switch device off and allow to cool. Fill boiler with water.
# 152 Water temperature exceeded in summer mode Switch device off and allow to cool. Fill boiler with water.
# 160 Undervoltage < 10.2 V Check battery voltage, charge if necessary.
Short-term immediate measure. Switch off major consumers or
start up vehicle engine until the heating system starts to operate
(approx. 4 minutes).
Battery capacity inadequate, if necessary exchange old battery.
# 161 Overvoltage > 16.4 V Check battery voltage and voltage sources such as the charger.
# 162 Open window above cowl (window switch) Close window.
# 164 No 230 V operating voltage
230 V fuse defective
Overheating protection has been triggered
Restore 230 V operating voltage.
Replace 230 V fuse.
Reset overheating protection. Allow heating system to cool,
remove connector cover and press reset button.
# 170 Risk of low voltage < 11.5 V Use the electrical power from the battery sparingly, e.g. restrict
lighting
Charge battery.
If these measures do not remedy the fault or fault codes are displayed that cannot be found in the troubleshooting
guide, please contact Truma Service.
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