Lennox MS8 SERIES Installation And Service Procedures page 75

HEAT PUMP FAILED START UP (CONTINUED)
Compressor will not
start in either
heating or cooling
modes.
Indoor unit leaking
water.
Abnormal sound or
vibration.
Either outdoor control has malfunction,
current limiting circuit protector failed,
or relay loop parallel capacitor leakage.
Loose or incorrectly installed compressor
harness.
Incorrect temperature setting.
Condensate line is blocked.
Condensate line insulation is missing
or loose.
Indoor fan motor assembly is loose or
in contact with other components.
Foreign object located in unit.
Compressor vibrates.
Line set vibration.
Outdoor unit fan or coil grille(s) not
secure.
Abnormal compressor noise.
FIGURE 85
Page 75
Replace outdoor control.
Verify wiring using unit wiring diagram and
correct.
Adjust air temperature setting.
Clear blockage.
Repair missing insulation.
Tighten fan motor assembly to unit or adjust
position of assembly.
Locate foreign object and remove.
Adjust compressor mounting hardware.
Verify line set is secure and not in contact with
external object.
Secure outdoor unit fan or coil grille(s).
Verify system charge and compressor input
voltage. If okay, replace compressor.
Corp. 1244-L9