American Dryer Corp MLG-460 manual Heater Fault Message

4b) To check “Interlock 2” (Heater Doors), verify that there is a 110 VAC signal on TB-41, on the Main Electrical Panel, when PLC (Programmable Logic Controller) output #4 is on.

NOTE: The heater door interlock switches are double-pole double-throw (DPDT). These switches affect different circuits.

•If there is 110 VAC at the panel go to paragraph #5b below.

•If there is not a signal, check circuit back to the burner door switches. Refer to the ML-460 Solenoid Junction Box Wiring Diagram for connection information.

5b) A quick way to check the load and unload door switches is to close the unload door (2-Door models) and toggle the load door’s “wobble arm,” and monitor INPUT #6 of the PLC (Programmable Logic Controller). Likewise, for 2-door models, close the load door and toggle the Unload door’s “wobble arm,” also monitor INPUT #7 of the PLC.

NOTE: The rotary arm switches mentioned are double-pole double-throw (DPDT), where the PLC (Programmable Logic Controller) signal and “door” switch effect different circuits.

•If input #6 L.E.D. (light emitting diode) of the (Programmable Logic Controller) goes on and off, the signal is “good.” Go to Section #5 on page 69 and page 70.

•If input #6 L.E.D. of the PLC doesn’t react, then perform the following

•Power down the dryer.

•Close the Load and Unload doors.

•Check for continuity between TB1-70 and TB1-7 on the Main Electrical Panel Refer to the dryer Main Panel Wiring Diagram.

•If no continuity, refer to the dryer Tumbler Junction Box Wiring diagram for detail information for door switch wiring.

6b) To check interlock 3 (PRS1 and PRS2), Gas pressure Hi/Lo switch:

•Power down the dryer.

•Check for continuity between TB1-18 and TB1-19.

•If no continuity, refer to the dryer Solenoid Junction Box wiring diagram for detail information for PRS1 and PRS2 wiring.

4.“HEATER FAULT” Message

PLC (Programmable Logic Controller) MESSAGE - “HEATER FAULT”

a)PROBABLE CAUSES;

1a) Fuse 6.

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