ad8370s3000a

Auxiliary heater (AHE), diagnosis, function check

Type ad · topic 83.70 · version 0101 · 2003-06-16

Applies to: MODEL 638 up to 15.11.97 with CODE (H12) Hot water auxiliary heater

Where it sits

Function group 3 Body › 83 Climate control › 83.70 Auxiliary/supplementary heater — Series 638

AD83.70-S-3000A

Auxiliary heater (AHE), diagnosis, function check

16.4.97

MODEL 638 up to 15.11.97 with CODE (H12) Hot water auxiliary heater

Auxiliary heater (ZHE), diagnosis, basic knowledge

AD83.70-S-2000A

Auxiliary heater function notes

AD83.70-S-2000-04A

Function check

Scope of test

Action/prerequisite

Nominal value

Possible cause/remedy

1

Switching on auxiliary heater with ZHE timer

Blower stage 0

Ignition OFF

Temperature selection dial set to maximum

Sufficient fuel in tank

Flame symbol appears on display and remaining time is indicated

Water pump switched on

Heater blower switched on in stage 1 (coolant temperature greater than 30 °C)

Heater/air conditioner control starts operating

AD83.70-S-4000A

2

Checking function

Auxiliary heater in operation

4 minutes after switching on the auxiliary heater the temperature of the air blowing should increase notably.

AD83.70-S-4000A

Referenced documents