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GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Inverter Flash
Code
Alert
Inverter
Code
Code
Red
Green
LED
LED
3
440
13
1 flash
flashes
Table 24. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes
31-5000751 Rev. 0
Priority
Actual Displayed
Condition
Alert Text
OD Inverter
Compressor
Information
Slowdown -
Only-Dealer
High Heat-Sink
temperature
Page 81
Component or System Operational State and Troubleshooting
Tip
Compressor slowdown due to high heat sink temperature.
• Heat sink temperature is approaching limit.
• The compressor speed automatically slows to reduce heat sink
temperature.
• The control sets indoor CFM and outdoor RPM to values according
to demand percentage rather than the actual Hz.
• The screws that hold the inverter to the inverter board may be loose
causing poor contact between these two components.
• Tighten screws that hold the heat sink to the inverter control board.
NOTE:
Wait five minutes for all capacitors to discharge before
checking screws.
•
This error code is primarily for informational purposes as the
inverter controls the compressor speed to operate within design
parameters. Typically the inverter will make a minor speed
reduction of 4 Hz (approximately a 5-6% speed reduction) for
a brief period of time and to reduce the heat sink temperature
and will then resume normal operation. This may occur at high
outdoor temperatures (above 110ºF) for brief periods of time (3 –
4 minutes) and is normal and expected operation of the inverter
controlling the compressor safely within design parameters.
•
The inverter finned aluminum heat sink is located on the back side
of the inverter in the condenser air stream. If the alert code 440
occur frequently, especially at lower outdoor temperatures, check
the heat sink for debris that may reduce heat transfer or possible
obstructions that may impact air flow across the heat sink.
•
The inverter will begin to briefly reduce the compressor speed
when the heat sink temperature rises above 185ºF and will
allow the inverter to resume the requested compressor demand
speed once the inverter heat sink reaches 176ºF. The heat
sink temperature, compressor speed in Hertz & the Inverter
Compressor Speed Reduction status ("On" or "Off ") notification
can be viewed under the outdoor unit Diagnostics section of the
thermostat dealer control center.
• Inverter LEDs will flash code 13.
• Refer to the unit service documentation for detailed troubleshooting
procedures.
Inverter flash code 13.
The sequence is:
•
Red LED: One Flash
•
Green LED: Three Flashes
NOTE:
Inverter normal operations with no error code present is as
follows. Red LED is ON and green LED is OFF.
How to Clear Alert
Code
Automatically clears
when the condition
no longer exists.
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