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| FORM |
| TROUBLESHOOTING |
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TABLE 50 – TROUBLESHOOTING |
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PROBLEM |
| CAUSE |
| SOLUTION |
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No display on panel. | 1. No 115VAC to 1T. | 1a. Check wiring and fuse | ||
Unit will not operate. |
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| 3FU |
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| b. Check wiring emergency | |
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| stop contacts 5 to L of CTB2 |
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| Terminal Block. |
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| c. Replace 1T | |
| 2. | No 24VAC to Microboard | 2. | Check wiring 1T to |
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| Microboard. |
| 3. | 1T defective, no | 3. Replace 1T | |
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| 24VAC output. |
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| 4. | Short in wire to temp. sensors | 4. | Unplug connections at |
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| or pressure transducers. |
| Microboard to isolate. |
| 5. | Defective Microboard | 5. | Replace Microboard. |
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| or Display board. |
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| NOTE: Contact YORK | |
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| Service before |
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| Replacing circuit Boards! |
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“FLOW SWITCH/REM | 1. No chilled liquid flow. | 1. | Check chilled liquid flow. | |
STOP NO RUN PERMISSIVE” |
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| 2. | Flow switch improperly | 2. | Check that the flow switch |
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| installed. |
| is installed according to |
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| manufacturer’s |
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| instructions. |
| 3. | Defective flow switch. | 3. | Replace flow switch. |
| 4. | Remote cycling device open. | 4. | Check cycling devices |
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| connected to terminals |
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| 13 & 14 of the CTB1 |
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| Terminal Block. |
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“LOW SUCTION PRESSURE” | 1. Improper suction pressure | 1. | Adjust per recommended | |
FAULT |
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| settings. | |
| 2. | Low refrigerant charge. | 2. | Repair leak if necessary |
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| and add refrigerant. |
| 3. | Fouled filter dryer. | 3. | Change dryer/core. |
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| CONT’D |
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3
YORK INTERNATIONAL | 105 |
