Troubleshooting
2. Remove the compressor’s left, right, and top covers exposing terminal blocks 12 through 18.
3. For checking the fan motor, remove wires 73, 74 and 75 from terminal blocks 14, 15 and 16
respectively.
4. With an ohmmeter, check the resistance between wires 73 and 74. Resistance should be
between 122 and 130 ohms. Check the resistance between wires 74 and 75. Resistance
should be between 63 and 71 ohms. If the resistances are outside their allowed ranges,
consult a SCAI Service Center. If there is no continuity, a winding is open. Consult a SCAI
Service Center.
5. With an ohmmeter, check for continuity between wire 74 and compressor bare sheet metal.
If there is continuity, the fan motor is grounded. Consult a SCAI Service Center.
6. If the fan motor passes these electrical checks, reconnect wires 73 and 75 to terminal blocks
14 and 16 respectively.
7. For checking the circulator motor, remove wires 68 and 77 from terminal blocks 17 and 18
respectively.
8. With an ohmmeter, check the resistance between wire 68 and 77. Resistance should be
between 13.2 and 14.2 ohms. If the resistance is outside the allowed range, consult a SCAI
Service Center. If there is no continuity, the winding is open. Consult a SCAI Service
Center.
9. With an ohmmeter, check for continuity between wire 68 and compressor bare sheet metal,
and between wire 77 and compressor bare sheet metal. If there is continuity, the circulator
motor is grounded. Consult a SCAI Service Center.
10. If the circulator motor passes these electrical checks, reconnect wires 68 and 77 to terminal
blocks 17 and 18 respectively
11. Replace compressor covers.
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