Table 1. Troubleshooting Procedures

TM 9-4120-425-14&P

OPERATOR TROUBLESHOOTING PROCEDURES - Continued

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Table 1. Troubleshooting Procedures - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING-

Check to see that sufficient air is

Remove any obstructions from

Continued

passing through condenser coil

condenser inlet and outlet. Make sure

by placing a piece of paper on the

that condenser louver outlets are open.

condenser guard. The paper

should be held against the guard

by the air.

NO HEAT OR LOW HEAT

Check to be sure that mode

Set switch to HEAT.

selector switch is properly

positioned.

Make sure that temperature

Adjust setting to warmer.

selector switch is set correctly.

Check for sufficient air

Remove any obstructions from

movement over heaters by

evaporator air intake and discharge

placing a piece of paper in front

louvers. Make sure that evaporator air

of the evaporator air intake

intake louver blades are open. Direct

louver. The paper should be held

discharge air louvers away from

against the louver by the air.

intake air. Refer to WP 0012-00.

Make sure that there is not too

Close or adjust fresh air damper door.

much outside air entering unit.

END OF TASK

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