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Thermo 90 S / Thermo 90 ST 3 Function description
303
A Glow plug
B Metering pump
C Combustion air fan
D Flame monitor
E Operation indicator light
F Circulating pump
G Vehicle fan
3.6 Malfunctions
3.6.1 Fault lock-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 button on the temperature limiter must be reset.
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 undervoltage guard switches off the system
for longer than 20 seconds, the fuel supply is interrupted.
CAUTION
A forced reset of the return spring when hot can result in
damage to the component.
Thermo 90 S and Thermo 90 ST
12 volts 10.5 V - 0.5 V
24 volts 21 V -1 V