Valeo Thermo plus 160 - Troubleshooting

501
Thermo plus 160/230/300/350 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 plus 160, plus 230, plus 300 and plus 350
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 and
unplugging
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 fuses F1, F2
and F3 (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.
• No supply voltage
• Fuses
• wiring harnes with connector C of the control device
Fuse F1 triggered. Short circuit in the wiring harnes to the heater.
Fuse F2 triggered. Short circuit in the circulating pump or the nozzle block
preheater (if installed).
Heater is functional, however the operation indicator
does not light.
Operation indicator defective or cables to
the operation indicator interrupted or shorted.