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SECTION IV
ELECTRICAL TROUBLESHOOTING
NOTE: Diagrams used in this section include: B474721, B472611, B483751, and ALL the revisions
(a revision is the letter after the number ‘ie’...B474721 B.)
NOTE: A VOLT/OHM meter is needed for this section.
A. No Display Condition...
1. Check top pocket circuit breaker panel for this particular dryer. If tripped, reset.
2. Check 0.5-amp fuse(s) located in the control box. If blown, replace.
3. Check for voltage (110,208,220,230,240) across the top motor contactor. This will have two (2) black wires
together to one point and two (2) white wires to another point on the contactor. Take a voltage reading
across these two points. For 208 volts and higher, it will be two (2) black and two (2) red wires.
4. If there is no voltage, the problem is bad wire(s) or termination(s) between the contactor and the J9 power
connector, or from the J9 connector to the incoming voltage. If voltage is present, check for voltage across
terminal block #6 and #8.
5. If there is no voltage, the problem is bad wire(s) or termination(s) between the contactor and the terminal
blocks #6 and #8. If voltage is present, check for voltage across pins 1 and 4 of the computer 4-pin
connector (J12).
6. If there is no voltage, the problem is a bad wire(s) or termination(s) between terminal blocks #6 and #8 and
the 4-pin connector (J12). If voltage is present, the problem is a faulty computer.
B. No Start Condition (motor does not turn)...
NOTE: The following sections must be performed with the appropriate output light emitting diode
(L.E.D.) and appropriate L.E.D. indicator dots on.
NOTE: In the following sections, the voltage readings are for 24 VAC unless otherwise specified.
NOTE: If the L.E.D. indicator dot is on and its appropriate L.E.D. output light is not on, replace
computer.
1. Check to see if the appropriate “door” L.E.D. light is on (refer to Section VI of this manual for L.E.D.
identification). If light is not on, refer to “door” section in the electrical troubleshooting of this manual.
2. Check for voltage across the coil connections of the particular contactor pertaining to the basket (tumbler)
being worked on (top contactor-top pocket, bottom contactor-bottom pocket).