Valeo Thermo E+ 120 - Page 31

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Thermo E+ 120/200/320 5 Troubleshooting
5.5.3 Error symptom "Low voltage"
A value is stored in the control unit as smallest "permis-
sible low voltage".
It must be noted that the voltage may be lowered during
heater start, and that the "low voltage" threshold may be
violated.
Among others this depends on the vehicle electrical sys-
tem, the temperature of optional components, such as the
nozzle block preheating, circulating pumps or heatable
filters.
NO
YES
Ensures the battery charge condition
permanently an operating voltage in the
permissible range
1
?
Ensure permanent battery voltage in the
permissible range
1
.
Disconnect the C plug from the control device.
Is the voltage between pin G and E of plug C in
the permissible range
1
?
Is the electrical connection to the heater OK?
(fuse, wiring harnesses, plug connections,
pins, etc.)
Repair or replace the
electrical connection to
the heater.
Start the heater: Is the voltage permanently applied to the heater during heater
start or during heating operation in the permissible range
1
?
Ensure higher voltage during heater
start and/or heating operation.
Control device defective, replace it.
1)
See Table 201 Technical Data in Chapter 2.