TECHNICAL TROUBLESHOOTING continued
Controller Display is BLANK, Main Power (ON / OFF) light or indicator is LIT
Probable diagnosis
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| Check for loose or | |
Check for 120 VAC at terminal | YES | disconnected black wires on | |
marked “LIM” & “N” | coil of contactor and black | ||
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| wires going to 24VAC | |
|
| transformers. | |
NO |
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| |
Trace circuit for terminal |
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| |
marked “LIM” brown wire to |
| Repair Open or damaged | |
back of unit and into molex | YES | ||
wire | |||
plug. Check for open |
| ||
|
| ||
circuit. |
|
|
NO
Check for continuity in rear |
|
|
of unit at molex plugs at | YES |
|
brown wires marked “50” | Check opposite side | |
and “51” |
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Part # JIBSM08 Rev.6 (08/04/09) | Page 41 |
