43
A904_O Inverter Fault -
DC Bus Overvoltage
•
Verify line voltage to equipment/
drive does not exceed maximum
allowable voltages
•
Incoming - >285 VAC
•
DC Bus - >385 VDC
•
Correct incoming line voltage issue.
•
Replace Drive.
Yellow 7 Flashes
A905_O Inverter Fault -
DC Bus Undervoltage
•
DC Bus voltage has dropped
below acceptable voltage
•
Incoming Voltage <187 VAC
•
DC Bus Voltage <175 VDC
•
Fault will reset when voltage is returned. Early
VSODU firmware (Before VSODU Rev 41)
may not properly
reset this fault. Update VSO
-
DU firmware to later revision.
•
Can occur with power flicker due to storms,
will reset when voltage returns after delay.
•
Check incoming Line Voltage to Drive.
Yellow 8 Flashes
A906_O Inverter Fault -
DC Bus Overvoltage
•
Incoming Voltage >275 VAC
•
Verify Incoming voltage to Drive by measuring
voltage at L1 to L2.
Yellow 10 Flashes
A907_O Inverter Fault -
DC Bus Undervoltage
•
Incoming Voltage <170 VAC
•
Verify Incoming voltage to Drive by measuring
voltage at L1 to L2.
Yellow 9 Flashes
T908_O Inverter Fault -
PIM Over-Temp
•
Indicates the PIM (Power
Inverter Module) on the drive is
overheated.
•
My stop or fold back compressor
RPM
•
Check outdoor fan operation.
•
Check Condenser coil for cleanliness.
•
Check Drive Heat Sink.
Yellow 4 or 18
Flashes
T909_O Inverter Fault -
PFC Over-temp
•
Indicates the PFC (Power Factor
Correction) is overheated.
•
May stop or fold back compres
-
sor RPM
•
Check outdoor fan operation.
•
Check Condenser coil for cleanliness.
•
Check Drive Heat Sink.
Yellow 4 or 18
Flashes
9.0 DIAGNOSTICS & TROUBLESHOOTING
9.3 Status and Diagnostic Codes
Diagnostics
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.