Service Manual

SERVICE MANUAL (C,H,T)VA9 & (C,H,T)VH8
421 08 5600 02 23
Specifications subject to change wi thout notice.
Variable Speed Drive LED Location and Description (Size 24)
COMM
STATUS
LED 207
LED 200
MOC LED Description (Size 24)
Reference Color Status Condition Description
LED200 Red
Steady
On
Normal Indicates MOC powered where DC bus at 40volts or higher
Off Abnormal No power, capacitor voltage drained
LED207 Amber
Steady
On
Normal Compressor is running
Blinking Abnormal
If compressor stops, it indicates some fault happening;
If compressor is running, it indicates speed is limited or reduced.
Off Normal Compressor stops and no fault
AOC LED Descriptions (Size 24)
Reference Color Status Condition Description
STATUS Amber
Steady
On
Normal AOC status - standby mode
Blinking Abnormal AOC function/fault status
COMM Green
Steady
On
Normal Communication from AOC to indoor wall control
LED Not Functioning Properly - Requires AOC or Inverter Replacement
Reference Color Suspect AOC board Failure Description
STATUS Amber
If Amber STATUS light is not on (neither steady nor blink-
ing), with power to outdoor unit
AOC STATUS is not functioning properly and AOC board
should be replaced.
COMM Green
In Communicating mode, if Green COMM LED is not on
when AB indoor wires are connected to AOC AB connector
and indoor has communications
AOC is not capable of communicating with indoor; AOC
board should be replaced.
Fault Codes requiring AOC or Inverter Replacement
Fault Code Description Fault Flash Code Failure Description
Communications Loss 179
Loss of communication with outdoor unit AOC board;
AOCorInvertermayneedtobereplaced
NOTE: If any of the AOC control board header pins are damaged or are not making good contact, AOC board should be replaced.