Table of Contents
Advertisement
4. TROUBLESHOOTING (cont'd.)
move the control panel (see Subsection 6.3.4), and pro-
ceed as follows:
1. Turn off power to the cooker at external circuit
breaker.
2. Disconnect all five wires from timer terminals (see
Figure 5-1).
3. Connect an ohmmeter between terminals 1 and 3.
4. Rotate timer dial beyond the "0-Minute" point (any
setting) to obtain a reading of zero ohms on the
ohmmeter. If zero ohm reading cannot be obtained,
timer contacts are defective and the timer must be
replaced.
5. Move ohmmeter leads to terminals 1 and 4.
6. Rotate timer dial to "0-Minute" position (an audible
click indicates correct position). If zero ohm read-
ing cannot be obtained, the timer is defective and
must be replaced.
7. Remove ohmmeter and replace all five leads on
timer terminals as shown in Figure 5-1.
4.3.3.2
Timer Motor
A defective timer motor will cause continuous opera-
tion in the TIME mode, with the timer dial failing to return
to the "0-Minute" position. Since thermostatic switch fail-
ure can cause the same symptom, fault must first be
isolated to the timer by testing the thermostat (see Sub-
section 5.4.8).
To confirm timer motor condition, proceed as follows:
1. Carefully check motor wire leads and tighten loose
connections.
WARNING
Use care while working with control panel.
Terminals carry 120 volts.
2. Turn on power to the cooker.
3. Set timer dial (any setting beyond "0-Minute"). If
operation is correct, the motor will turn the dial
toward "0-Minute." If the motor fails to operate, it
is defective and the entire timer must be replaced.
4. Shut off power to the cooker.
4.3.4
Door Interlock Switch
Malfunction of the cooker door interlock switch pre-
vents timer indicator lights from turning on and steam
solenoid from opening when the timer dial is set. If steam
Form No. S-4846 Rev. A 11/98
does not enter the compartment and the indicator light
fails to turn on with the door latch securely engaged, the
fault may be in the door interlock switch. Proceed as
follows:
1. Turn off power to the cooker.
2. Disconnect wires to the door switch terminals (see
Figure 5-1).
3. Connect an ohmmeter between the terminals of the
switch.
4. Actuate the switch by closing the cooking com-
partment door. If a zero reading cannot be ob-
tained, the switch is defective and must be
replaced.
5. Remove the ohmmeter and replace the leads on
switch terminals (see Figure 5-1).
4.3.5
Indicator Lights
If the cooker compartment functions correctly, with
the single exception that the indicator light fails to light
during operation, the fault is a defective indicator light. A
"burned out" or defective light is verified by using an AC
voltmeter at the leads, with input power on the selector
switch in the correct position for that timer, the timer set,
and the door latches closed. If 120 volts is present, the
fault is in the indicator light and requires replacement. If
120 volts is not present, the fault is in the wiring or con-
trol components (selector switch, timer, or door switch).
4.3.6
Cooking Compartment Thermostatic
Switch
A thermostatic switch included in the circuit for the
timer motor delays timer operation until steam flowing
into the compartment satisfies the temperature-actuated
switch device. If a timer motor fails to operate within
about one minute after the indicator light comes on (with
cooker compartment empty), the cause may be a defec-
tive thermostatic switch. To test the switch, proceed as
follows:
1. Disconnect the two wires connected to the thermo-
static switch terminals.
2. Connect an ohmmeter between the two terminals
of the switch.
3. Place the cooker into operation and observe ohm-
meter dial. Within one minute of operation, the
switch contacts close automatically to register a
4-6
Advertisement
Table of Contents
