[Anonymous]

Our Eberspacher heater failed last week and while trying to sort it out (new motor, glowplug, gaskets etc, £650 inc VAT – ouch), I did manage to track down the full list of the fault codes which can be called up via the programmable 7 day timer. I hope you never need them, but they could save you a small fortune.

regards
Paul

Fault
Code / Fault Description Comments
00 Normal operation
01 Warning – over voltage
02 Warning – under voltage Check batteries and charging system.
04 Warning – output short circuit
05 Warning – output short circuit, anti-theft alarm Refer to heater technical manual.
09 TRS – shut down Replace control unit.
10 Over-voltage shutdown
11 Under-voltage shutdown Check batteries and charging system.
12 Overheat at overheat sensor Check air duct or coolant hose for blockage. Test overheat sensor.
13 Overheat at flame sensor Check air duct or coolant hose for blockage. Test flame sensor.
14 Potential overheat detected Excessive temperature rise through the heater. Check air duct or coolant hose for blockage.
15Too many overheat shutdowns. Overheat with excessive temperature (AIRTRONIC). Check air duct or coolant hose for blockage. Test overheat sensor. Reset control unit using Diagnostic Unit or 7-Day Timer.
17 Overheat with excessive temperature Check air duct for coolant hose for blockage. Test overheat sensor. Replace control unit.
20 Open circuit – glow pin / glow plug
21 Short circuit – glow pin / glow plug. Test glow pin / plug and wire harness.
22 Short circuit – glow plug relay contacts Test glow plug relay and replace (only D2H control unit).
23 Open circuit – glow plug relay
24 Short circuit – glow plug relay. Test relay and wire harness.
25 Short circuit – diagnostic output Test diagnostic wire harness for short circuit
30 Blower motor will not turn Relieve cause of jam Replace blower if necessary
31 Open circuit – blower motor
32 Short circuit – blower motor Test blower motor and wire harness.
33 Blower motor speed deviation (>10%) Measure blower speed using no-contact instrument. (Air heater only)
34 Open circuit – water valve relay Test wiring and relay connections.
35 Open circuit – partial load resistor relay
36 Short circuit – partial load resistor relay. Test resistor and wire harness.
37 Coolant pump does not rotate Test coolant pump.
38 Open circuit – vehicle blower relay
39 Short circuit – vehicle blower relay. Test relay and wire harness. Replace relay.
40 Short circuit – water valve relay Test water valve relay and wire harness for short circuit. Replace relay.
41 Open circuit – coolant pump
42 Short circuit – coolant pump. Test coolant pump and wire harness.
43 Short circuit – external components Test external components for short circuit.
47 Short circuit – fuel-metering pump
48 Open circuit – fuel-metering pump. Test fuel-metering pump and wire harness for short circuit.
50 Too many start attempts. Perform fuel-quantity test. Check combustion air and exhaust hose for blockage. Test glow pin / glow plug. Test flame sensor. Reset control unit using Diagnostic Unit or 7-Day Timer.
51 Faulty flame recognition Test flame sensor.
52 No start. Safety time exceeded. Perform fuel-quantity test. Check combustion air and exhaust hose for blockage. Test glow pin / glow plug. Test flame sensor.
53 Flame cutout in boost mode
54 Flame cutout in high mode
55 Flame cutout in medium mode
56 Flame cutout in low mode. Flame was established, but was extinguished. Perform fuel-quantity test. Check combustion air and exhaust hose for blockage. Test glow pin / glow plug. Test flame sensor.
57 Flame sensor defect Test connection at flame sensor.
58 Flame detected on cool down Test flame sensor.
59 Coolant excessive temperature rise Check coolant flow.
60 Open circuit –temperature control sensor
61 Short circuit –temperature control sensor. Test external temp sensor and wire harness (air heater). Test water temperature sensors (coolant heater).
62 Open circuit – potentiometer
63 Short circuit – potentiometer. Test controller and wire harness.
64 Open circuit – flame sensor
65 Short circuit – flame sensor. Test flame sensor and wire harness.
71 Open circuit – overheat sensor
72 Short circuit – overheat sensor. Test overheat sensor and wire harness.
73 Overheat sensor – excessive temperature rise Check air duct or coolant hose for blockage. Test overheat sensor.
90 Control unit defect – internal fault
91 External voltage disturbance
92 Control unit defect – ROM error
93 Control unit defect – RAM error
94 Control unit defect – EEPROM error. Malfunction due to interference voltage from vehicle electrical system (i.e. poor battery or charger). Remove interference voltage. Replace control unit.
96 Control unit defect – internal temperature sensor Replace control unit or use external air temperature sensor (air heater).
97 Control unit defect Replace control unit.

[Author]

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