Electrical Fault Isolation Guide; 60-Minute Timer; Timer Contacts; Timer Motor - Market Forge Industries ST-24 Owner's Manual

Pressureless

Hide thumbs

Table Of Contents

Table of Contents

1. Will not operate in either CONSTANT STEAM or 60-

MINUTE TIMER positions.

2. Operating in CONSTANT STEAM position but not in

60-MINUTE TIMER position.

3. Operates in 60-MINUTE TIMER position but not in

CONSTANT STEAM position.

4. Steam solenoid valve fails to open with indicator light

on.

5. Indicator light off when steam solenoid valve open.

6. With indicator light on and steam solenoid valve open,

timer dial fails to turn.

7. Buzzer fails to sound at end of 60-MINUTE TIMER

mode.

8. Steam flows continuously from boiler drain line.

60-MINUTE TIMER

Timer Contacts

Defective timer contacts will result in failure of either cooker compartment to operate. When this occurs,

remove the control panel (see Exterior Panel Removal on page 27), and proceed as follows:

1. Turn off power to the cooker at external circuit breaker.

2. Disconnect all five wires from timer terminals (see Figure 4 on page 22).

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 as shown in Figure 4 on page 22.

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 (see Cooking Compartment Thermostatic

Switch on page 20).