TM 9-4120-401-14
Table 4-2.
UNIT TROUBLESHOOTING - continued
MALFUNCTION
TEST OR INSPECTION
C O R R E C T I V E ACTION
6. REDUCED HEATING CAPACITY. - continued
Step 7. Check operation of heater cutout switch.
Step 8. Check individual heaters.
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Use disconnect switch (NOT POWER CABLE) to disconnect power to unit.
Damage to cable connector pins will result if cable is used.
Step 1. Check for loose or damaged electrical connectors, or damaged wires in wiring harnesses.
Tighten or replace loose or damaged connectors, or replace damaged wires
Step 2. Check operation of heater relay.
Step 3. Check operation of potentiometer TEMPERATURE control.
Test potentiometer TEMPERATURE control. (See paragraph 4-27.) Replace control if
defective.
Step 4. Check operation of MODE selector rotary switch.
4-30