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4. TROUBLESHOOTING (cont'd.)
zero ohm reading on the dial. If a zero ohm reading
is not obtained, the switch is defective.
4. Shut off cooker, disconnect ohmmeter leads, and
replace wires on switch terminals.
4.3.7
Buzzer
If the buzzer does not sound at the termination of the
operator-selected timer setting (timer dial returned to
"0-Minute" position), the fault may be a defective buzzer.
Buzzer operation is verified using an AC voltmeter at
buzzer coil connections with input power on and selector
switch and coinciding timer dial set at the "0-Minute" po-
sition. If voltage is 120 volts, the fault is in the buzzer,
which must be replaced. If 120 volts is not present, the
fault is in the wiring or control components (timer or se-
lector switch).
4.3.8
Cold Water Condenser Circuit
If during cooker operation steam exits from the drain
line opening (located in lower boiler compartment) and
the condensing system fails to operate, as evidenced by
repeated discharge of water from the drain line, the con-
densing circuit is malfunctioning. The failure can be
caused by a defective condenser thermostat or cold wa-
ter solenoid coil, or by wiring failure. To test condenser
thermostat, refer to Subsection 5.4.8.
If the condenser thermostat functions correctly, but
either of the cold water solenoid valves fails to operate,
the cause might be a faulty valve coil. A defective coil is
found using an AC voltmeter to check the voltage at the
coil wire terminals with the cooker compartment in op-
eration. If voltage of 120 volts is present and the valve
fails to open, the fault is in the valve coil. Defective valve
coils are separately replaceable.
4.3.9
Wiring
All of the electrical components of the cooker (timers,
indicator lights, etc.) are connected to each other by wir-
ing shown in Figure 5-1. If all of the electrical compo-
nents are operating correctly (and the incoming power
has been checked), but the cooker fails to operate, the
fault lies in the wiring.
Figure 5-1 is a diagram that shows all terminals and
interconnections within the electrical circuits. All num-
bered terminals are identified and all leads number-coded
M
F
I
, I
ARKET
ORGE
NDUSTRIES
NC
35 G
S
E
, MA 02149
ARVEY
TREET
VERETT
T
: 617-387-4100 T
: 91-9494
EL
ELEX
F
: 617-387-4456 O
AX
UTSIDE
6
Form No. S-4846
.
MA: 800-227-2659
-
Rev. A 11/98
as shown. Connections can be easily removed. Fig-
ure 5-2 shows the same information schematically and
is an aid in isolating circuits for testing.
Using an ohmmeter, wiring continuity between the
connections shown on the wiring diagram (Figure 5-1) is
readily verified. This is best done in stages, removing
only those wires required for each continuity check. As
each lead is replaced, it should be checked for evidence
of corrosion, and cleaned if necessary. All leads must
be tightly attached so as to provide a good electrical
connection.
4.4 WATER LEVEL CONTROL BOARD
The Dual-Function Water Level Controller is two con-
trols on one board. One controller maintains correct wa-
ter level in the generator, while the other is a low-water
safety cutoff.
The following troubleshooting procedure will only de-
termine if the Water Level Control Board is working prop-
erly. It will not determine why the board has failed.
THIS PROCEDURE EXPOSES YOU TO A
SHOCK HAZARD AND MUST BE PERFORMED
ONLY BY A QUALIFIED SERVICE
TECHNICIAN.
IMPROPERLY CONNECTED OR
MALFUNCTIONING WATER LEVEL
CONTROLLER MAY CAUSE DAMAGE TO THE
STEAM GENERATOR DUE TO LOW WATER,
OR CREATE A SCALDING HAZARD TO THE
OPERATOR DUE TO A HOT WATER
OVERFLOW CONDITION.
Tools Required: A digital or analog volt meter capable
of reading 120 volts AC and a jumper wire with alligator
clips.
Procedure:
1. Turn off all power to the unit.
2. Remove control panel or right-side access panel.
Refer to Figure 6-1 for relay locations and terminal
identification.
3. Remove the wires from the terminal connectors "G,"
"H," and "LLCO."
4-7
WARNING:
WARNING:
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