Trouble Analysis Procedure

A multimeter is required for some of the following checkout procedures. Before performing any tests, check if the dryer power supply is 1 phase, 230 volt, or 3 phase, 230 or 460 volt.

•The burner circuit is 120 volts AC on all standard U. S. production models.

•The control circuit to the motor starters is 120 AC volts.

•The safety circuit is 12 volts DC

•When checking these circuits, measure voltage between the cir cuit test location and to ground.

•DC circuits should be measured between the test location and its respective DC ground.

Refer to wiring diagrams and the parts list for identification of parts and the electrical terminals.

CAUTION: When making high volt- age tests with "live" circuits, be ex- tremely careful. Follow established safety practices. Turn power on for testing only. Do not attempt to make the dryer operate by using a jumper wire to bypass a defective safety component.

Problem

Possible Cause

Control power switch light off.

1.Check that main power and circuit breakers are turned on. Check for tripped breaker.

2.Check for blown 5 amp fuses.

3.Monitor relay is defective.

4.Defective transformer or wiring.

5.Check for a defective power switch.

6.Check wiring between fuses and input/output board. Refer to wiring diagram for test locations.

Control power light is on, reset button has been pressed,	1.	Power interruption: Incoming power to the dryer has
drying mode light off.		been interrupted. The display screen will show the date
		and time if this has occured, once power has returned.
This indicates control power is present at input/output	2.	Display not finished initial setup: The monitor will
board, but no power is being transferred through the I/O		display a copyright message and model number, total
board.		running time in hours and minutes and then the current
		date and time. To activate the controller press the reset
		button.
	3.	Input/output board: The input/output board has devel-
		oped a problem that requires its replacement.

No display on LCD screen.

1.Check for a defective power switch.

2.Check wiring between fuses and input/output board.

3.Check for 120 volts AC between points J9-3 and AC-1.

4.The display may have a malfunction requiring its replacement.

Control power light is on, drying mode light is on--load

auger, fan, heater, unload auger will not operate.

1.Press the dryer power start button.

2.Refer to the problem listed for load auger, fan heater and unload auger in the following sections.

Display shows "L1 VOLTAGE LOST" message.

The left circuit breaker located on the input/output board of the Electronic Monitoring Control System has tripped, or one of the hardware timers on the Electronic Monitoring Control System has shut down the dryer.

Display shows "12 VOLT POWER SUPPLY WARNING"

message.

The right circuit breaker located on the input/output board of the Electronic Monitoring Control System has tripped.

Display shows "MOTOR OVERLOAD" message.	The thermal overload on the fan motor, load motor, unload
	motor or an auxiliary motor has opened indicating an
	overloaded motor. (The overloads must be manually reset).