Market Forge Industries 3500 사용자 설명서

13

The electrical trouble-shooting procedures that follow 

require  access  to  components  and  terminals  of  the 

electrical control panel shown in Fig. 6 on page 21. 

Electrical  controls are reached  by removing  screws 

that fasten the control panel to the frame. The panel 

may be pulled forward for testing while interconnect-

ed to the cooker circuits or disconnected at the pin 

connection for complete removal and repair.

Before trouble-shooting any of the electrical parts or 

assemblies, verify that power is being supplied to the 

cooker. 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.

The first step in any electrical trouble-shooting pro-

cedure is a thorough physical inspection of all wiring 

connections. 

Before removing control panel or checking connec-

tions and wiring, be sure that the circuit breaker for in-

coming power is OFF. When power is supplied, all ex-

posed 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 nec-

essary, visually inspect all quick-disconnect terminals 

for evidence of corrosion. Terminals in this condition 

should be separated, cleaned with emery cloth until 

shiny, and tightly reconnected.



Defective timer contacts will result in failure of either 

cooker  compartment  to  operate.  When  this  occurs, 

remove the control panel and proceed as follows:

Turn  off  power  to  the  cooker  at  external  circuit 

breaker.
Disconnect all five wires from timer terminals. (see 

Fig. 2, page 11).

1.

2.

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.