Malfunctions; Fault Lock-Out; Diagnosis After Fault Lock-Out; Version With Digital Timer/Switch - Webasto Thermo 90 ST D Service And Repair Manual

THERMO 90 ST
3.5 M
ALFUNCTIONS
3.5.1 F L -
AULT OCK OUT
Fuel is supplied for max. 240 seconds if the flame does
not start to burn.
Fuel is supplied for max. 240 seconds if the flame goes
out during operation.
The fuel supply is shut off if the system overheats
(temperature limiter is tripped). If the system overheats
the temperature limiter will reset itself after cool down
period.
Once the cause of the fault has been eliminated, the
fault lock-out is cancelled by switching the heater off and
on again.
If the under voltage protection switches off the system
for longer than 20 seconds, the fuel supply is interrupted
and the heater is shut off. (see table below).
12 volts
24 volts
CAUTION: A forced reset of the return
spring when hot can result in damage to
the component.
3.5.2 D
IAGNOSIS AFTER
Check the fuses and plug connectors.
3.5.2.1 V
ERSION WITH
If the system is equipped with a standard timer, a fault
message appears on the display of the digital timer after
a fault occurs:
F 01 No start (after 2 attempts to start)
F 02 Flame failure
F 03 Under voltage or over voltage
F 04 Premature flame recognition
F 05 Flame monitor interrupt or flame monitor
short circuit
F 06 Temperature sensor interrupt or temperature
sensor short circuit
F 07 Metering pump interrupt or metering pump
short circuit
F 08 Fan motor interrupt or fan motor short circuit
or fan motor incorrect speed
F 09 Glow pin interrupt or glow pin short circuit
F 10 Overheating
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Thermo 90 ST
10.5 V - 0.5 V
21 V -1 V
F L -
AULT OCK OUT
D T
IGITAL IMER
FUNCTIONAL DESCRIPTION
F 11 Circulating pump interrupt or circulating
pump short circuit
3.5.2.2 V
ERSION WITH
If the system is operated with a switch, the nature of the
fault is indicated by a flashing code on an operating
indicator light during the run-on time of the heater.
After five short signals, count the long flashes:
1x No start (after 2 attempts to start)
2x Flame failure
3x Under voltage or over voltage
4x Premature flame recognition
5x Flame monitor interrupt or flame monitor
short circuit
6x Temperature sensor interrupt or temperature
sensor short circuit
7x Metering pump interrupt or metering pump
short circuit
8x Fan motor interrupt or fan motor short circuit
or fan motor incorrect speed
9x Glow pin interrupt or glow pin short circuit
10x Overheating
11x Circulating pump interrupt or circulating
pump short circuit
9
S
WITCH
Webasto Product N.A., Inc.