Relay Logic Chart - KitchenAid KOST100ESS Technical Education

ELECTRONIC CONTROL DIAGNOSTIC MODE AND COMPONENT TESTING
Failure/Error Codes

Relay Logic Chart

The chart below provides information about how the relays react in any cooking mode. The Legend at
the bottom of the chart shows what each symbol means. During each of the convection modes the
convection fan and convection element cycle on and off to maintain proper heat - no big surprise
there. The normal BAKE mode also uses the convection fan and element to get heat build up faster in
PREHEAT and help maintain temperatures during the cycle. The convection fan can be seen working
during the cooking mode and raises questions by consumers. The chart confirms that the convection
fan and element do cycle during the normal cycles too. Remember that the fan will cycle OFF
FOR SERVICE TECHNICIAN'S USE ONLY
whenever the oven door is opened. This chart is available in the Tech Sheet that is provided with every
oven Kitchen Aid produces.
To properly check for voltage, complete the following steps:
1. Unplug oven or disconnect power.
2.
Connect voltage measurement equipment to check
points.
Component
Lights
Latch Switch
Door Switch
Latch Motor
Oven Temperature
Sensor
Meat Probe
Blower Motor -
High Speed
Blower Motor -
Low Speed
3-8 Built-In Single and Double Wall Oven
n
Thermal Limiter
Thermal Fuse (only
for single/double)
Relay Logic
Bake (Non-Convect cavity) C
Bake (Convect cavity)
Broil
Bread Proof
Convect Bake
Convect Broil
Convect Roast
Self-Clean
Relay Off Relay Cycles
- C
Component Testing Chart - Oven
Serviceable Side Check Points
Copernicus
Front P5-2 to N (J8-2)
Front P3-7 to P3-5
Front P3-6 to P3-5
Front P5-1 to N (J8-2)
Front P3-1 to P3-2
Side P3-3 to P3-4
Rear P5-5 to N (P7-1)
Rear P5-4 to N (J8-2)
Rear PX3-1 to L2 (Main line) Closed circuit
Front J8-1 to L1 (P5-7)
Modes
Bake Broil Conv
Ring
C NA
C C C
- O -
C C -
C C C
- O -
C C C
C C -
LEGEND
Relay On Not Available
O NA
3. Plug in oven or reconnect power and confirm voltage
reading.
4. Unplug oven or disconnect power.
Results-Resistance Results-Voltage
0Ω to 40Ω
Open circuit
Closed circuit with
oven door closed
500Ω to 3000Ω
1075Ω at 68°F
(20°C) DLB
9876Ω to 10075Ω
15Ω to 23Ω
15Ω to 23Ω
Closed circuit
Conv
Fan
NA
C
-
-
C
C
C
-
120 VAC
120 VAC motor running
120 VAC motor running
120 VAC motor running
0V closed, N/A open
0V closed, N/A open