4b) To check “Interlock 2” (Heater Doors), verify that there is a 110 VAC signal on
NOTE: The heater door interlock switches are
•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
5b) A quick way to check the load and unload door switches is to close the unload door
NOTE: The rotary arm switches mentioned are
•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
•If no continuity, refer to the
6b) To check interlock 3 (PRS1 and PRS2), Gas pressure Hi/Lo switch:
•Power down the dryer.
•Check for continuity between
•If no continuity, refer to the
4.“HEATER FAULT” Message
PLC (Programmable Logic Controller) MESSAGE - “HEATER FAULT”
a)PROBABLE CAUSES;
1a) Fuse 6.
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