15
Fault code / Description of fault Comment
• Remedy
062 Operator control unit interrupted •Disconnect connector from operator control unit and measure resistance
value of set value poti. Connection pins see page 16 to 23.
If the resistance value is OK, then reconnect connector to operator
control unit.
•Disconnect connection S1/B1 at
AIRTRONIC
. In connector housing B1,
measure resistance value between PIN 6 and PIN 7.
If resistance value OK, --> replace controller.
Resistance value for interruption between PIN 6 and PIN 7 > 7175 W.
Normal value: 1740 W – 2180 W (± 80 W).
063 Operator control unit short-circuit •If a ‘ventilating’ switch has been built in, disconnect and check function.
If not o.k. --> replace switch.
Fault recognition only works in •Disconnect connector from operator control unit.
heating mode. However, if a short If fault code 062 is displayed, replace operator control unit.
circuit already exists and the If operator control unit OK, check connection lines 0.5 green/red
AIRTRONIC
is subsequently and 0.5 brown/white for short-circuit.
switched on, ‘ventilating’ mode will If OK, --> reconnect connector to operator control unit.
be active (no fault code). •Disconnect connection S1/B1 at
AIRTRONIC
.
If fault 063 is still displayed, --> replace controller.
Resistance value for short circuit between PIN 6 and PIN 7 < 486 W.
Normal value: 1740 W – 2180 W (± 80 W).
064 Flame sensor interrupted •Remove controller and disconnect green connector from controller.
Check flame sensor, diagram and values table see page 28.
If flame sensor OK, --> replace controller.
Resistance value for interruption > 7175 W.
065 Flame sensor short circuit •Remove controller and disconnect green connector from controller.
If fault 064 is displayed, --> replace combi-sensor.
If fault 065 is still displayed, --> replace control unit.
Resistance value for short circuit < 486 W, see also diagram page 28.
071 Overheating sensor interrupted •Remove controller, disconnect blue and green connectors from controller.
Measure resistance value at blue connector PIN 1 (cable 0.5² blue)
and at green connector PIN 2 (cable 0.5² brown/white).
If OK, --> replace controller.
Resistance value for interruption > 223 kW, see also diagram page 28.
072 Overheating sensor – short circuit •Remove controller, disconnect blue connector from control unit.
If fault 071 displayed, --> replace combi-sensor.
If fault 072 is still displayed, --> replace controller.
Resistance value for short circuit < 183 W, see also diagram page 28.
090 Controller defect (internal fault) Replace controller.
091 External fault voltage Fault in controller caused by fault voltages from vehicle power supply.
Possible causes: Poor battery, battery charger --> eliminate fault voltage.
092 Controller defect (ROM fault) Replace controller.
094 Controller defect (EEPROM fault) Replace controller.
096 Internal temperature sensor defect Replace controller or use external temperature sensor.
097 Controller defect Replace controller.
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