Thermo E 200 / 320 5 Troubleshooting and error correction
501
5 Troubleshooting and error
correction
5.1 General
This section describes troubleshooting and error correc-
tion for Thermo E 200 and E 320 heaters.
ATTENTION
Troubleshooting and error correction may only be
performed by briefed and competent trained personnel.
In case of doubt functional connections can be obtained in
chapters 3 and 4.
Error detection is usually limited to localizing the faulty
component.
The following malfunction causes are not taken into
account and should basically always be verified and/or a
malfunction due to these reasons should be excluded:
• Corrosion on plugs
• Loose plug connections
• Crimp failures on plugs and/or pins
• Corrosion on cable and fuses
• Corrosion on battery terminals
• Cable insulation damage
ATTENTION
Prior to replacing a fuse troubleshooting needs to be
performed. The heater must be disconnected from the
vehicle electrical system and the fuse is to be replaced
when the heater is in currentless state.
A properly dimensioned fuse must be inserted (see
chapter 6 Schematic diagrams).
After each error correction a functional test must be
performed in the vehicle.
5.2 General error symptoms
The following table lists possible, general error symptoms.
Table 501: General error symptoms
Error symptom Possible cause
Error in the electronics
Operating display is not illuminated and the heater does
not function.
• No supply voltage
• Fuses
• Supply cable to the plug contacts of plug A of the
control unit
Fuse F1 triggered. Short circuit or overload of cables, heater components or
of the circulating pump
Check cables, connectors and components and replace
if required.
Fuse F2 triggered. Short circuit in the supply cable to the main switch or, if
installed, in the digital timer
Heater is functional, however the operating display is not
illuminated
Operating display defective to cables to the operating
display interrupted or shorted
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