Valeo Thermo E+ 120 - Troubleshooting

501
Thermo E+ 120/200/320 5 Troubleshooting
5 Troubleshooting
5.1 General
The safety instructions and regulations of Chapter 1
(see 1.6 ) must be observed.
This section describes troubleshooting and error correc-
tion for Thermo E+ 120, E+ 200 and E+ 320 heaters.
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
• Damage to contacts due to frequent plugging in and
out.
ATTENTION:
Prior to replacing a fuse, troubleshooting needs to be
performed. The heater must be disconnected from the
vehicle electrical system (see 5.2).
A properly dimensioned fuse must be inserted (see
chapter 6 wiring diagrams).
After each error correction a functional test must be
performed in the vehicle.
5.2 Disconnecting the heater from the
vehicle electrical system
Some troubleshooting procedures require to disconnect
the heater from the vehicle electrical system.
ATTENTION:
The disconnection from the vehicle electrical system
must not be carried out via the plug on the heater
(under voltage).
This can be done for example by pulling the fuse F1 (see
wirings in Cha. 6).
5.3 General error symptoms
The following table lists possible, general error symptoms.
Danger to life and health!
Warning!
Table 501 General error symptoms
Error symptom Possible cause
Error in the electronics
Operation indicator does not light and the heater does
not function.
• Lamp/LED of the operation indicator is defective
• No supply voltage.
• Fuses triggered / interrupted
• cable to contact A of the connector C of the control
device
Fuse F1 triggered. Short circuit or overload of lines, heater components or
the circulation pump. Check wires and connectors and
components and replace if necessary.
Fuse F2 triggered. Short circuit in the supply line of the main switch or, if
used, in the preselection timer
Heater is functional, however the operation indicator
does not light.
Operating indicator defective or cables to
the operation indicator interrupted or shorted.