FAULT CODE 020 OR 021: GLOW PIN OPEN CIRCUIT OR GLOW PIN SHORT CIRCUIT. (Cont) -726250883

TM 9-2320-364-34-1

Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical circuits, a direct short

may result. Damage to equipment, injury or death to personnel may occur.

NOTE

Refer to arctic heater (Model B) troubleshooting (TM 9-2320-364-20) for fault code retrieval device

(FCRD) operation.

If the fault code retrieval device (FCRD) is not installed, the arctic heater indicator light displays the

diagnostic flash codes for the arctic heater. These flash codes are 8 seconds long and repeat after 8

seconds.

The fault code retrieval device (FCRD) displays the last 5 faults that occur. The latest fault displayed

is either AF or F1. If more than one fault code is displayed, troubleshoot the latest fault code first.

Perform Steps (5) and (6) only if fault code retrieval device (FCRD) is available.

VERIFY REPAIR

(1) If removed, install arctic heater glow pin

harness and nut on arctic heater glow

pin terminal (Para 18-2.2).

(2) If removed, install arctic heater control

unit (Para 18-2.2).

(3) Connect arctic heater unit harness

connector to arctic heater control unit

(TM 9-2320-364-20).

(4) Ensure vehicle is returned to normal

operating condition.

(5) Install fault code retrieval device

(FCRD) on arctic heater unit harness

diagnostic connector.

(6) Press `the D button on fault code

retrieval device (FCRD) to turn arctic

heater ON.

(7) Turn arctic heater ON

(TM 9-2320-364-10).

(8) Observe arctic heater indicator light

or fault code retrieval device (FCRD)

display, if installed. Note if arctic

heater indicator light flashes code

shown.

(9) Observe arctic heater for proper

operation.

(10)Turn arctic heater switch to OFF

(TM 9-2320-364-10) or press the

D button on the fault code retrieval

device (FCRD), if installed.

(11) If installed, remove fault code retrieval

device (FCRD).

(12)Install cover on arctic heater

(TM 9-2320-364-20).

(a) If arctic heater operates normally

and arctic heater indicator light is

illuminated (Fault code 000

displayed on FCRD). Fault has

been corrected.

(b) If arctic heater indicator light

flashed flash code shown (Fault

020 or 021 displayed on FCRD),

notify supervisor.

flashed different flash code (Fault

code other than 020 or 021

displayed on FCRD), troubleshoot

arctic heater fault code displayed

(TM 9-2320-364-20).

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