44
9.0 DIAGNOSTICS & TROUBLESHOOTING
Diagnostics
9.3 Status and Diagnostic Codes (cont.)
The error codes below will be displayed at the EcoNet™ Control Center under Service window / Current Faults
or in the Fault History and will be time and date stamped. VSODC (Variable Speed Outdoor Unit Control –
EcoNet™ control board) fault code is what will be displayed on the VSODC.
A910_O Inverter Fault -
Lost Rotor Position
•
Compressor rotor not matching
speed command
•
Measure via Back EMF
•
Verify Compressor Connections at U, V, W
and Molded plug.
•
System Grossly Overcharged.
•
Compressor Tight or Locked.
•
Drive Defective - Solder Bridging.
Yellow 2 Flashes
T911_O Inverter Fault -
Current Imbalance
•
Compresor Current Imbalance
•
Verify Compressor Connections at U, V, W
and Molded plug.
•
Check Compressor Windings for significant
differences in resistance.
Yellow 14 Flashes
A912_O Inverter Fault -
Micro Fault
•
Micro on Drive Faulted
•
Hard Reset on Drive.
•
If Hard Reset fails, replace Drive.
Yellow 13 Flashes
A913_O Inverter Fault -
PIM Sensor Open
•
Power Inverter Module tempera
-
ture sensor is open
•
Replace Drive.
Yellow 2 Flashes
T914_O Inverter Fault -
DC Voltage Low
•
DC Bus voltage is runnin low
•
Check Incoming Line Voltage at L1 to L2.
•
Voltage on DC Bus is generally 325 to
380VDC.
•
PIM on Drive Defective
•
Replace Drive.
Yellow 17 Flases
T915_O Inverter Fault -
Discharge Temp
•
Compressor Discharge Tem
-
perature has exceed 235
o
F
degrees and compressor may
fold back until temperature is
below 200
o
F
•
Verify Operating Superheat and Charge.
•
Check Reversing Valve for leakage from
Discharge to Suction.
•
Check DLT Sensor Connection to Drive.
•
Verify DLT sensor resistance
Yellow 6 Flases
