JULY 30, 2014
9
3500 SERIES CONVECTION STEAMERS
60 MINUTE TIMER
Timer Contacts
Defective timer contacts will result in failure of either cook-
er compartment to operate. When this occurs, remove the
control panel and proceed as follows:
1. Turn off power to the cooker at external circuit break-
er.
2. Disconnect all five wires from timer terminals.
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 reading
cannot be obtained, the timer is defective and must
be replaced.
7. Remove ohmmeter and replace all five leads on timer
terminals.
TIMER MOTOR
A defective timer motor will cause continuous operation
in the Time mode, with the timer dial failing to return to
the “0 Minute” position. Since thermostatic switch failure
can cause the same symptom, fault must first be isolated
to the timer by testing the thermostat (
Refer to cooking
compartment thermostatic switch section
).
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 op-
eration 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.
DOOR INTERLOCK SWITCH
Malfunction of the cooker door interlock switch prevents
timer indicator lights from turning on and steam solenoid
from opening when the timer dial is set. If steam 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.
3. Connect an ohmmeter between the terminals of the
switch.
4. Actuate the switch by closing the cooking compart-
ment door. If a zero reading cannot be obtained, the
switch is defective and must be replaced.
5. 5. Remove the ohmmeter and replace the leads on
switch terminals.
STEAM SOLENOID VALVES
When either inlet solenoid valve fails to operate, the fault
may be a defective coil. A defective coil is found using an
AC volt-meter to check the voltage at the coil wire ter-
minals, with the cooker compartment operating in either
constant steam or 60 minute timer mode. If voltage of
120 volts is present and the coil fails to open the valves,
the fault is in the valve coil. Defective valve coils are not
separately replaceable, requiring complete valve replace-
ment.
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 volt-meter
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 control components
(selector switch, timer, or door switch).
