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TM 9-4120-389-14
Table 4-2. UNIT TROUBLESHOOTING-(cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 7.
Check for loose or damaged wires and terminals.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Tighten loose or damaged terminals. Repair or replace damaged wires. (See
para. 4-36).
Step 8.
Check operation of heater cut-out switch (S3). Test switch (See para. 4-57).
Replace thermostat if defective.
Step 9.
Check individual heating elements (HR1 through HR6). Test heaters. (See para. 4-56).
Replace defective heating element per para. 4-56.
6.
NO HEAT IN EITHER HI HEAT OR LO HEAT MODE.
Step 1.
Check for loose or damaged electrical connectors, or damaged wires in wiring harnesses.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Tighten or replace loose or damaged connectors or repair damaged wires.
4-56
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