JULY 30, 2014
6
3500 SERIES CONVECTION STEAMERS
FAILURE
FAULT LOCATION
1. Will not operate in either constant steam or 60 minute timer.
A. Incoming power.
B. Timer.
C. Door interlock switch/relay.
D. Wiring.
2. Operating in constant steam position, but not in 60 minute timer.
A. 60 minute timer.
B. Wiring.
3. Operating in 60 minute timer position, but not in constant steam.
A. Timer.
B. Wiring.
4. Steam solenoid valve fails to open with indicator light on.
A. Solenoid valve coil.
B. Wiring.
5. Indicator light off with steam solenoid valve open.
A. Indicator light.
B. Wiring.
6. With indicator light off steam solenoid valve open, timer dial fails to turn. A. Compartment thermostatic switch.
B. Constant steam position.
C. Timer motor.
D. Wiring.
7. Buzzer fails to sound at end of 60 minute timer mode.
A. 60 minute timer contacts.
B. Buzzer.
C. Wiring.
8. Steam flows continuously form boiler drain line.
A. Thermostatic switch.
B. Cold water solenoid valve.
C. Wiring.
The electrical trouble-shooting procedures that follow re-
quire access to components and terminals of the electri-
cal control panel. Electrical controls are reached by re-
moving screws that fasten the control panel to the frame.
The panel may be pulled forward for testing while inter-
connected to the cooker circuits or disconnected at the
pin connection for complete removal and repair.
ELECTRICAL FAULT ISOLATION
Correction of an electrical failure first requires isolation of
the fault to a single circuit or component. In most cases,
the nature of the failure and its effect upon the operation
of the cooker will be sufficient to narrow it down to one
or more circuit elements. Refer to the isolating electrical
faults table below.
INCOMING POWER
Before trouble-shooting any of the electrical parts or as-
semblies, verify that power is being supplied to the cook-
er. Incoming power is connected at the boiler (or direct-
connected steam) control box located in the base cabinet.
With power connected to the cooker, an AC volt-meter is
used to measure 120 volts across L1 and L2. If 120 volts
is present, and the cooker will not operate, the fault lies
within the electrical circuits of the cooker.
ELECTRIC INSPECTION
The first step in any electrical trouble-shooting procedure
is a thorough physical inspection of all wiring connections.
WARNING:
Before removing control panel or checking
connections and wiring, be sure that the cir-
cuit breaker for incoming power is OFF. When
power is supplied, all exposed terminals of the
control panel carry 120 volts.
Check all wiring connections by hand to assure that both
ends of all connection points are tightly secured. Use a
screwdriver to tighten connection points. If necessary, vi-
sually inspect all quick-disconnect terminals for evidence
of corrosion. Terminals in this condition should be sepa-
rated, cleaned with emery cloth until shiny, and tightly re-
connected.
