TM9-4120-400-14
Table 4-2.
TROUBLESHOOTING - continued
MALFUNCTION
TEST OR INSPECTION
C O R R E C T I V E ACTION
CONDENSER AIR OUTLET VOLUME LOW.
Step 1. Check for dirty condenser coil or guard. (See para 4-48.)
Clean coil and guard.
Step 2. Inspect condenser fan for damage. (See para 4-44.)
Replace fan.
Step 3. Check that air outlet louvers are not stuck or jammed in closed position.
Free louvers and control cable, Adjust control, or notify supervisor if actuating cylinder is not
working properly.
AIR CONDITIONER FAILS TO HEAT.
Step 1. Check MODE SELECTOR switch for improper setting.
Set MODE SELECTOR switch to LOW HEAT or HIGH HEAT.
Step 2. Make sure that TEMPERATURE SELECTOR switch is set properly.
Reset switch, if necessary.
Step 3. Check for dirty evaporator return air filter. (See para 4-13.)
Clean filter.
Step 4. Check evaporator fan motor for proper operation. (See para 4-41.)
Replace bad motor.
Step 5. Make continuity check of TEMPERATURE SELECTOR switch or MODE SELECTOR switch. (See
Replace bad switch.
Step 6. Inspect heaters and wiring for loose connections or damage. (See para 4-43.)
Tighten connections and fix bad wiring. Replace bad heater elements.
Step 7. Check continuity of heater relay coils. (See para 4-31.)
Replace bad relay.
Step 8. Check operation of heater high-temperature cutout thermostatic switch. It should open when
Replace bad thermostatic switch.
4-36
