Operating instructions

Malfunctions
Fault Shutdown
If the flame fails to materialize fuel is delivered for max.
180 seconds.
If the flame is extinguished during operation fuel is de-
livered for max. 90 seconds.
In the event of overheating (tripping of temperature
limiter) no fuel is delivered.
In the event of a shutdown initiated by the undervoltage
protection device
Thermo 90 Thermo 90 S
12 volts 10,5V ± 0,5V 10,5V – 0,5V
24 volts 21V ± 1V 21V – 1V
for more than 20 seconds,no fuel is delivered.
After the cause of malfunction has been eliminated, inter-
lock deactivation is to be performed by switching the
heater off and then back on. If an overheating condition
has occurred the pushbutton of the temperature limiter
must be reset.
Diagnosis in the Event of a Fault Shutdown Thermo 90 S
Check fuses and electrical connections.
After the occurrence of a malfunction, the fault is indicated
on the display of the digital timer if the heater is equipped
with a standard digital timer:
F 01 No start (after 2 start-up attempts)
F 02 Flame extinction (recurrent >5)
F 03 Undervoltage or overvoltage
F 04 Premature flame detection
F 05 Flame detector interruption or
flame detector short circuit
F 06 Temperature sensor interruption or
temperature sensor short circuit
F 07 Metering pump interruption or
metering pump short circuit
F 08 Blower motor interruption or
blower motor short circuit
blower motor incorrect speed
F 09 Pencil-type glow plug interruption or
pencil-type glow plug short circuit
F 10 Overheating
F 11 Circulating pump interruption or
circulation pump short circuit
If the heater is activated by the switch, the types of mal-
functions are indicated by coded flashing signals via the
operation indicator light during the after-run period of the
heater.
After five short signals have been emitted, the long flash-
ing pulses can be counted:
1x No start (after 2 start-up attempts)
2x Flame extinction (recurrent >5)
3x Undervoltage or overvoltage
4x Premature flame detection
5x Flame detector interruption or
flame detector short circuit
6x Temperature sensor interruption or
temperature sensor short circuit
7x Metering pump interruption or
metering pump short circuit
8x Blower motor interruption or
blower motor short circuit
blower motor incorrect speed
9x Pencil-type glow plug interruption or
pencil-type glow plug short circuit
10x Overheating
11x Circulating pump interruption or
circulating pump short circuit
Thermo 90 / Thermo 90 S
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