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BBW 46 / DBW 46

5 Troubleshootin

501

5. Troubleshootin

5.1 General

This section describes troubleshooting procedures for the

heaters BBW 46 and DBW 46.

CAUTION

Troubleshooting requires profound knowledge about

components and their theory of operation and may only be

performed by trained personnel.

In case of doubt functional interrelations may be derived

from Sections 2 and 3.

CAUTION

Troubleshooting is normally limited to the isolation of

defective components. The following possible causes for

trouble have not been taken into consideration and must

always be excluded as a possible cause for malfunction:

corrosion on connectors

loose contacts on connectors

wrong crimping on connectors

corrosion on wiring and fuses

corrosion on battery terminals

After any fault correction a functional checkout in the

vehicle has to be performed.

5.2 General Fault Symptoms

The following diagram (Fig. 501) lists possible fault

symptoms of general nature.

Fig. 501 General Failure Symptoms



Symptom

After switch-on - no function

Error lockout - after approx. 60 sec

Error lockout - after 80 sec

Error lockout - after approx. 90 sec

Error lockout - after 270 sec

Circulation pump - does not operate

Glow plug - remains cold

Dosing pump - does not operate

Combustion air fan - does not operate

Combustion - stops

Vehicle interior - does not warm up

Heater - does not switch to part load

Combustion air fan - operates after switch-on

●

Power supply/electrical wiring

Fuses (electrical)

Control unit

Circulation pump

Glow plug*

Temperature fuse/limiter

Dosing pump

Combustion air fan

Fuel supply

Combustion air supply

Exhaust ducting

Flame sensor

Temperature sensor

Vehicle air fan

Water circuit

Part load resistor

Water circuit/temperature > 70 °C

Low voltage protection*

●

●●

●

Check, repair or replace as required

●

* not applicable for control units

with Ident. No.

439 789 (12 Volt) and

439 797 (24 Volt)

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 39 40

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