Technical data

Troubleshooting Air Top 2000 ST
504
F 05 Flame monitor
interrupt or short
circuit
(only petrol heater)
1A Flame monitor circuit
The switched cable of the element has a
short circuit to earth
9A Flame monitor circuit
interrupt or short circuit to +Ub
Replace flame monitor
Replace flame monitor
F 06 External temperature
sensor interrupt or
short circuit
14 Temperature sensor circuit
short circuit to earth
94 Temperature sensor circuit interrupt or
short circuit to +Ub
Check cables/ replace temperature sensor
Check cables and terminating resistor /
replace temperature sensor
F 07 Metering pump
interrupt or short
circuit
88 Break or short circuit to +Ub
08 Short circuit to earth
Check cables/ replace metering pump
Check cables/ replace metering pump
F 08 Drive unit
(combustion and hot
air blower) interrupt
or short circuit
89 Break or short circuit to +Ub
09 The switched drive unit cable
(combustion and hot air blower) has a
short circuit to earth or the drive unit is
overloaded
15 Burner motor block guard has tripped
95 Burner motor blocking detection has
tripped
Replace drive unit (combustion and hot air
blower)
Eliminate the cause of the blockage /
difficulty in movement
Replace drive unit (combustion and hot air
blower)
F 09 Glow plug interrupt
or short circuit
8A glow plug:
Break or short circuit to +Ub
19
Glow circuit: The switched cable of the
element has a short circuit to earth
Replace glow plug
Replace glow plug
F 10 Overheating 06 The overheating fault lock-out has
tripped (heater overheated)
17 Incorrect application or illegal
insulation (OHS gradient too high)
Find and remove the cause of the
overheating
NOTE
If no other cause can be found for the
overheating, the pressure losses caused
by the hot air distribution (too many
resistance points) are too high or a hot air
filter is soiled
F 11 Overheating sensor
interrupt or short
circuit
AB Overheating sensor circuit:
break or short circuit to +Ub
1B Overheating sensor circuit:
the switched cable of the element has a
short circuit to earth
Replace overheating sensor
Replace overheating sensor
Error
code
Error (group) Additional information during PC
diagnostic
Troubleshooting
Fig. 503 Troubleshooting