Eberspächer Airtronic B5 Troubleshooting And Repair Instructions - page 23
Fault code
Fault description
Comments
Display
• Remedial action
Troubleshooting
23
• Disconnect the plug-in connection of the external room temperature sensor
and measure the resistance value, see page 9 for diagram and values table, if
temperature sensor ok –> reconnect plug-in connection.
• Disconnect connector S1 / B1 at the heater and measure the resistance value
in connector housing B1 between PIN 6 and PIN 12. If an interruption exists
the ohmic value between PIN 6 and PIN 12 > 3000
Ω . If resistance value ok
–> replace control box, see page 28.
• Disconnect plug-in connection of the external room temperature sensor, if error
code 060 is displayed –> check external room temperature sensor, see
page 9 for diagram and values table.
If external room temperature sensor ok –> check the connection cables 0.5
2
gr
and 0.5
2
br/ws for short circuit, if ok –> reconnect plug-in connection.
• Disconnect connector S1 / B1 at the heater and measure the resistance value
in connector housing B1 between PIN 6 and PIN 12.
If a short circuit exists the ohmic value between PIN 6 and PIN 12 < 800
Ω. If
the error 061 continues to be displayed, –> replace control box, see page 28.
• Remove connector at the control unit and measure the resistance value of the
setpoint potentiometer, for connector pins see page 36 ff. If the resistance va-
lue is ok –> reconnect connector at the control unit.
• Disconnect connector S1 / B1 at the heater and measure the resistance value
between PIN 6 and PIN 7 in the connector housing B1, if resistance value is ok
–> replace control box, see page 28.
Resistance value in case of interruption between PIN 6 and PIN 7 > 3000
Ω.
Normal value: 1750
Ω ±30 Ω – 2180 Ω ±80 Ω.
• If „Ventilate“ switch is installed, disconnect it and check it is working. If ok –>
disconnect the connector at the control unit, if error code 062 is displayed, re-
place control unit.
• If control unit ok –> check connection cables 0.5
2
gr / rt and 0.5
2
br / ws for
short circuit, if ok –> reconnect connector at control unit.
• Disconnect connector S1 / B1 at the heater, if the error 063 continues to be
displayed –> replace control box, see Page 28
Resistance value in case of short circuit between PIN 6 and PIN 7 < 800
Ω.
Normal values: 1750
Ω ±30 Ω – 2180 Ω ±80 Ω.
• Dismantle control box and disconnect green connector from control box.
Check flame sensor, for diagram and table of values please refer to page 30, if
flame sensor ok –> replace control box, see page 28.
Resistance value in case of interruption > 3000
Ω.
• Dismantle control box, remove green connector from control box, if error 064
is displayed –> replace combination sensor, see page 29.
If error 065 continues to be displayed –> replace control box, see page 28.
Resistance value in case of short circuit < 500
Ω, see also diagram on
page 30.
• Dismantle control box, disconnect blue and green connectors from control
box. Measure resistance value at the blue connector PIN 1 (cable 0.5
2
bl) and
at the green connector PIN 2 (cable 0.5
2
br / ws), if ok –> replace control box,
see page 28. Resistance value in case of interruption >700 k
Ω, see also dia-
gram on page 30.
• Dismantle control box, remove blue connector from control box, if error 071 is
displayed –> replace combination sensor, see Page 27.
If error 072 continues to be displayed –> replace control box, see page 28.
Resistance value in case of short circuit < 120
Ω, see also diagram on page 30.
• Overheating threshold value is not detected by control box —> replace control
box, see page 28.
External room temperature
sensor – interruption
External room temperature
sensor – short circuit
Control unit – interruption
Control unit – short circuit
Fault recognition only works in
heating mode. If, on the other
hand, the short circuit has
already occurred and then the
heater is switched on, „Ventilati-
on“ is active (not a fault code).
Flame sensor (combination
sensor) – interruption
Flame sensor (combination
sensor) – short circuit
Overheating sensor – interruption
Overheating sensor – short
circuit
Control box defective
060
061
062
063
064
065
071
072
074
4