Table 4-1. Oven Troubleshooting

TM 5-6640-213-14

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. LOSS OF HEAT CONTROL.

Check for thermostat malfunction,

Replace thermostat if defective.

2. FLUCTUATION OF TEMPERATURES.

Step 1.

Check if vent shutter cap is closed,

Open vent shutter cap to maximum.

Check if chamber is improperly loaded.

Step 2.

Redistribute load.

Check if insufficient time for temperature to stabilize.

Step 3.

Allow one hour for temperature stabilization,

Step 4.

Check if line voltage fluctuates.

Check line voltage and correct defect,

Step 5.

Check for intermittent failure of switch, thermostat or wiring,

Check and correct defect.

3. HEAT LOSS.

Worn door gasket, or door catch malfunction.

Replace door gasket if damaged, adjust door catch.

4. CHAMBER DOES NOT HEAT.

Step 1,

Check if line voltage, switch or electrical connection is malfunc -

tioning.

4-3