Automatic heater (HEAT) test of electrical system

AD83.25-W-6000A

Automatic heater (HEAT) test of electrical system

24.9.97

Automatic heater (HEAT), diagnosis, basic knowledge

AD83.25-W-2000A



Automatic heater (HEAT), function diagram

GF83.25-W-0001-01A



Cables, connectors and fuses are also taken into account on the tests and, if a fault is displayed, may have to be checked again separately in accordance with the relevant electric wiring diagram for open-circuit, good contact and correct connection.



The abbreviations specified in the test instructions e.g. terminal B1, relate to the terminal designation of both control module couplings B and C. Terminal B2 is not assigned and is used for coding.

a

On-board voltage 22.5-29.5 V

b

Ignition: OFF

c

Disconnect connectors on control module. Connect the connectors with the electrical connection set and carry out the corresponding measurement with the Multimeter.

AD83.25-W-2000-03A

Testing

1

Control module voltage supply, testing electrical system, HEAT

AD83.25-W-6000-01A

2

Temperature selector, testing electrical system, HEAT

AD83.25-W-6000-02A

3

Duo heating water valve, testing electrical system, HEAT

AD83.25-W-6000-03A

4

Outside temperature sensor, testing electrical system, HEAT

AD83.25-W-6000-04A

5

Heat exchanger temperature sensor, testing electrical system, HEAT

AD83.25-W-6000-05A

6

Room temperature sensor, testing electrical system, HEAT

AD83.25-W-6000-06A

7

Control module, testing electrical system, HEAT

Control modules up to 1984 without marking

AD83.25-W-6000-07A

8

Control module, testing electrical system, HEAT

Control modules as of 1985 with marking (blue dot)

AD83.25-W-6000-07B