Thermo Top E and Z/C 5 Troubleshooting
503
Fig. 502 Error Messages (Sheet 2 of 2)
5.3 Malfunctions
5.3.1 Error Lockout by Malfunction of Heater
In case of a "no flame-up" condition fuel is delivered for a
maximum of 180 seconds.
In the event of overheating (temperature limiter responds)
fuel delivery is stopped immediately.
In all cases of malfunction (except for a defect on the
combustion air fan) there will be an error lockout with a
subsequent run-down. Dependent on the software variant
implemented there might be deviations from the run-down
times specified.
NOTE
An error lockout due to overheating does not display an
indication.
5.3.2 Error Lockout due to Low or High Voltage
A low voltage level of 9.8 ± 0.3 V (measured at the wiring
harness input) over a period of 20 seconds will cause an
error lockout with a run-down of 120 seconds.
A high voltage level of 15.5 ± 0.5 V (measured at the
heater) over a period of more than 6 seconds will also
cause an error lockout with a run-down of 120 seconds.
5.3.3 Error Lockout Reset
NOTE
Before attempting an error lockout reset check fuse F1 in
Webasto flat fuse holder. A 15 A fuse must be replaced
with a 20 A fuse.
If the heater nevertheless fails to switch on, reset error
lockout according to 5.3.3.4.
5.3.3.1 Error Lockout Reset Thermo Top E and C with
"Timer"
Eliminate cause of trouble.
Switch off heater using the instant heat switch on the timer
and switch on again. If heater fails to switch on, perform
error lockout reset according to 5.3.3.4.
An error lockout due to overheating does not have an
indication.
The fuse is not blown in case of overheating.
The error lockout may be cleared by disconnection of the
power supply of the control unit.
Perform error lockout reset according to 5.3.3.4.
Glow plug short circuit
Thermo Top Z:
• Switched line short circuit to plus of power supply
• Overload or short circuit of glow plug
Thermo Top E und C:
• Ground short in power supply line to glow plug
Glow plug open circuit
Open line to glow plug / flame sensor
• Short circuit to plus of power supply
• Rise in coolant temperature within 9 min after start is < 3 K (Thermo Top C only)
Water pump short circuit
Thermo Top Z:
• Switched line short circuit to plus of power supply
• Overload or short circuit of circulation pump
Thermo Top E und C:
• Ground short in power supply line to circulation pump
• Overload
Water pump open circuit
• Open line to circulation pump
• Short circuit to plus of power supply
Fan short circuit • Line to fan relay shorted against ground
• Overload of output to fan trigger ( I > 500 mA)
F1
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