Lennox LGH102H4M User Manual

Page 86
TABLE 30
DIRECT DRIVE BLOWER MOTOR TROUBLESHOOTING
Failure Error Warning Reason Troubleshoot
Locked Rotor •
No changes in hall signals
within 2000ms
Check for obstruction keeping
impeller from rotating
Braking Mode •
Warning, no error code set,
Motor start not possible after
20 sec
Check for secondary airflow source in
the system causing the impeller to
rotate backwards when off
Hall Error •
Combination of 3 hall signals
gives false signal after one
rotation
Measure voltage across each leg,
Check electrical connections
Power Module Overheated • Temperature > 115C
Check operating conditions in blower
compartment, Check for high motor
load (current draw), Check for
corrosion-free and secure electrical
connections
Motor Overheated •
Motor over-temperature protec
tor opens
Gate Driver Error • Internal software fault
Measure voltage across each leg,
Check electrical connections
Phase Failure •
Input voltage has phase imbal
ance
Measure voltage across each leg,
Check electrical connections, Repair
low/high voltage leg(s)
DC Link Voltage Low •
Rectified DC link voltage is too
low
DC Link Over-voltage •
Rectified DC link voltage is too
high
Line Over-voltage • Line voltage too high
Line Under-voltage • Line voltage too low
Communication Error •
Internal communication failure.
Not connected with master/
slave wiring
Check low voltage wiring connections
DC Link Voltage Low •
Warning, not low enough to set
error code
Measure voltage across each leg,
Check electrical connections, Repair
low/high voltage leg(s)
Electronics Temp High •
Warning, not high enough to
set error code, Temperature >
95C
Check operating conditions in blower
compartment, Check for high motor
load (current draw), Check for
corrosion-free and secure
electrical connections
Power Module Temp High •
Warning, not high enough to
set error code, Temperature >
105C
Motor Temp High •
Warning, not high enough to
set error code, Temperature >
130C

Lennox LGH102H4M Specifications

General

Brand	Lennox
Model	LGH102H4M
Category	Air Handlers
Language	English