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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.
EcoNet error code at
Control Center
VSODU
Fault Code
Description
Possible Resolution(s)
EV2 Drive
LED Code
A900_O Inverter Fault -
Identity Fault
•
The inverter drive itself is not
programmer and is not field
serviceable.
•
This fault should not occur in the
field
•
Replace drive
LED’s unlikely to
display anything
T901_O Inverter Fault -
Compressor Overcurrent
•
Compressor is pulling more
current than allowed
•
Compressor Shorted to Ground - Check resis
-
tance of windings to ground.
•
Wiring to compressor or molded plug damage
- Inspect compressor wiring harness.
•
Wire not secure on U, V or W - Check con
-
nections.
•
Defective Drive - Replace Drive
Yellow 1 or 3
or
Red 4 Flashes
T902 Inverter Fault -
Enveloper Protection
•
Compressor current outside
of predetermined envelope for
RPM’s
•
Will display 31 at VSODC at time of fault - Will
return to operation after time delay.
•
Must occur 15 times in a 24 hour period to be
displayed in control center fault history.
•
Verify refrigerant charge, often related to
overcharge
T903_O Inverter Fault -
PFC Overcurrent
•
PFC (Power Factor Correction)
module is detecting high current
internally
•
Check and replace chocke. If replacement
choke and hard reset doesn’t correct the fault,
replace drive.
