Troubleshooting
Error Symptom Possible cause Remedy
Heater can’t be switched on Heater is in the overheating lock-out mode Remove 15A fuse
Determine cause
Summer/winter switch in summer position Switch to correct position
Discharged battery Charge
Defective fuse Replace
Defective digital timer Use testing device on heater and check if digital timer switches properly:
disconnect connector X14 from heater, connect testing device and switch
on digital timer. The indicator lamp must light up; if not, the timer is defective
and the power supply to the timer is disrupted.
Alternatively: Check if 12 V voltage is present across contact 1 (6-pole
connector).
Break in the power supply to the digital timer Check if 12V voltage is present across the red and brown wires of the
connector of the digital timer. If necessary check fuse F2 and cables wires.
Break in the power supply to the heater Disconnect connector X 15 from the heater and use the testing device to
check for presence of voltage.
Heater fails to ignite, fan motor is operating Intermediate fuel reservoir empty Allow vehicle engine to run for approx. 30 seconds
Heater operates for a few minutes only Heater not seated properly in its support, exhaust gas is
aspirated
Loosen 2 M6 screws and position correctly
Fuel lines of heater not properly connected. Flow and return
pipes were interchanged.
Connect fuel lines in accordance with installation instructions
A non-return valve may have been installed in the fuel line
between heater and vehicle tank, or in the vehicle tank itself
(intermediate fuel reservoir is not ventilated).
Kinked coolant hose or system has not been bled completely Check line routing, bleed cooling system (start engine)
Insufficient heat output Heater control lever or vehicle fan out incorrectly set Prior to operating the heater set heater control lever to "warm" and set fan
switch to a higher setting.
Vehicle fan fails to switch on when the thre-
shold temperature (>30° of coolant) is
reached
Defective fuse F3 Replace fuse
Blue smoke or soot in the exhaust gas,
heater is emitting smoke
Kinked or blocked suction or exhaust gas line Check lines for unobstructed passage
Installation fault, heater is not properly seated in its support, or
gasket of exhaust gas pipe was not installed
Check installation
Thermo Top
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