Oven Door Lock System Current Flow; The Oven Temperature Sensor - Whirlpool 465 User Manual

OVEN DOOR LOCK SYSTEM
Voltage is supplied to the control transformer whenever the range is plugged in. Current flows from
L1, through the transformer, to the neutral side of the line. When voltage is supplied to the EOCs
Latch Solenoid Relay, current flows through the Latch Solenoid, to the neutral side of the line.
L1
BK
OVEN CONTROL
BROIL RELAY
BK
P3-1
LATCH RELAY
(N.O.)
* PULSE 1 SECOND

THE OVEN TEMPERATURE SENSOR

The oven temperature sensor is a "Resistance Temperature Detector" (RTD), and is composed
of a stainless steel tube with a thin film of platinum at the end. It is located at the upper left rear corner
of the oven cavity. The RTD is a nonadjustable assembly, but may be checked at room
temperature, or at 350˚F. A sensor resistance of less than 550 ohms is regarded as a shorted
sensor, and a resistance greater than 3000 ohms is regarded as an open sensor. When the oven
control senses a resistance of less than 550 ohms, and greater than 3000 ohms, the bake and broil
functions will be turned off.
To test the oven temperature sensor, perform the
following steps:
1. Use an ohmmeter and set the range switch to
R x 10.
2. With no power applied, touch the leads of the
ohmmeter to the connector pins of the sensor
(you do not have to separate the connectors).
Depending upon the oven temperature, you
should obtain the corresponding reading
shown in the chart:
CURRENT FLOW
BAKE IGNITOR
BU
P3-4
LATCH
SOLENOID
BR
P4
P5
BAKE VALVE
W
P2-4
P1-6
P1-1
P1-3
W
Temperature (˚F)
32 ± 1.9
75 ± 2.5
250 ± 4.4
350 ± 5.4
450 ± 6.9
550 ± 8.2
650 ± 8.6
900 ± 13.6
- 22 -
OVEN CONTROL
TRANSFORMER
P2-1
BAKE RELAY
V V
P1-7
SENSOR
DOOR
SWITCH
Y GY
P1-5
DOOR LATCH
SWITCH
BU GY
Ω
Resistance ( )
1000 ± 4.0
1091 ± 5.3
1453 ± 8.9
1654 ± 10.8
1853 ± 13.5
2047 ± 15.8
2237 ± 18.5
2697 ± 24.4
N
W