KitchenAid Whirlpool W11400254 Service Manual page 26

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DIAGNOSTICS (Cont.)
Display Likely Failure
Condition
F8E5 Exhaust air
temperature
detection
failure
Primary, Monitor, Secondary and Door Interlock Switch Checkout Procedures
IMPORTANT: Before checking the interlock switches, unplug microwave oven or disconnect power. Be sure to disconnect all of the
wires at the switch being tested before making any continuity readings.
NOTE: The Primary Interlock switch, Monitor Interlock switch, Secondary, and Door Interlock Switch are mounted in the door lock
switch cradle. All the Interlock Switches can be identified by the wire colors that are connected to the terminals of the switches. See
the chart below for wire color designation.
NOTE: Interlock, Monitor switches and Door interlock switch cannot be adjusted and all these switches should be replaced if any one of
them is found to be defective. After replacing interlock/monitor switches, reconnect wires to switch and check for continuity.
Switch Check By
Primary Interlock 1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Primary Interlock Switch.
3. Check from the common terminal (black/black wires) to the normally open
4. Reconnect wires to switch.
Monitor Interlock 1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Monitor Interlock Switch.
3. Check from the common terminal (white/red wires) to the normally closed
4. Reconnect wires to switch.
Secondary Interlock 1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Secondary Interlock Switch.
3. Check from the common terminal (white/blue wires) to the normally open
4. Reconnect wires to switch.
Door Interlock 1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Door Interlock Switch.
3. Check from the common terminal (blue wire) to the normally closed
4. Reconnect wires to switch.
(+) Continuity (-) No Continuity
n
2-6 Microwave Hood Combination
For Service Technician Use Only
Recommended Repair Procedure
1. Enter the Diagnostics mode (press CANCEL -CANCEL - START), and then press WARM
HOLD to display the HF NTC thermistor reading. Verify the temperature reading is at room
temperature (typically 50°F to 90°F [10°C to 32°C]) and verify failure code. If failure code
matches complaint, continue to Step 2.
2. Unplug microwave oven or disconnect power.
3. Disconnect HF NTC thermistor cable from ACU PCBA.
4. Measure resistance between connector pins and confirm reading is between 9.5 kΩ and
10.5 kΩ at room temperature. If measurement is not correct or a short or open circuit is
found, replace HF NTC thermistor.
5. Replace all parts and panels before operating.
6. Plug in microwave oven or reconnect power.
7. Enter the Diagnostics mode (press CANCEL -CANCEL - START), and then press WARM HOLD
to display the HF NTC thermistor reading. Verify the temperature reading. If it is still not
correct, replace ACU PCBA.
8. If failure does not appear, stop.
terminal (black/white wires).
terminal (blue/white wires).
terminal (blue/blue wires).
terminal (orange wire).
Door Open Door Closed
- +
+ -
- +
+ -