Common Errors

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E1

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Indoor pipe temp sensor fault

Is the sensor properly plugged onto board?

Yes No

E1

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Indoor pipe temp sensor fault

Unplug sensor. Is it reading properly? 27KΩ @ 72°F 83KΩ @ 32°F

Yes Back No

E1

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Indoor pipe temp sensor fault

Are the pins on the board and the sensor connector free of corrosion or defect?

Yes Back No

E1

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Indoor pipe temp sensor fault

Replace board.

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E1

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Indoor pipe temp sensor fault

Fix connection.

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E1

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Indoor pipe temp sensor fault

Replace sensor.

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E1

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Indoor pipe temp sensor fault

Rehab the connector if possible. Replace sensor and/or board if needed.

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F5

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Inverter power module (IPM) over current

Is supply voltage correct? Are the wire connections to IPM and compressor correct per wire diagram? Is the insulation of the wires good?

Yes No

F5

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Inverter power module (IPM) over current

Are the compressor windings shorted/grounded?

Yes Back No

F5

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Inverter power module (IPM) over current

Replace compressor.

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F5

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Inverter power module (IPM) over current

Correct the wiring.

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F5

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Inverter power module (IPM) over current

Replace IPM.

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F12

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Outdoor EEPROM failure

Turn off power, wait 1 minute and power back on. Does error return?

Yes No

F12

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Outdoor EEPROM failure

Replace outdoor main board.

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F12

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Outdoor EEPROM failure

Take no further action.

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E5

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Frosted indoor coil

Is the indoor coil sensor in place?

Yes No

E5

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Frosted indoor coil

Is the coil sensor reading properly? Unplug off board. 27KΩ @ 72°F 83KΩ @ 32°F

Yes Back No

E5

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Frosted indoor coil

Is air flowing properly? If unit is ducted is the duct designed per design spec?

Yes Back No

E5

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Frosted indoor coil

Does the system have a refrigerant leak?

Yes Back No

E5

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Frosted indoor coil

Repair and recharge system.

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E5

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Frosted indoor coil

Adjust or replace EEV coil.

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E5

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Frosted indoor coil

Is the unit oversized for the room?

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E5

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Frosted indoor coil

Downsize unit.

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E5

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Frosted indoor coil

Fix placement.

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E5

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Frosted indoor coil

Replace sensor.

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E5

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Frosted indoor coil

Unblock or adjust air flow.

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E5

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Frosted indoor coil

Is EEV coil out of position or have an open coil?

Yes Back No

E5

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Frosted indoor coil

Is indoor ambient air sensor reading properly? 27KΩ @ 72°F 83KΩ @ 32°F

Yes Back No

E5

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Frosted indoor coil

Replace ambient sensor.

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E5

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Frosted indoor coil

Replace indoor PCB.

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E7

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Communication failure.

The connecting wiring between the outdoor and indoor units should be 14-4 (14 gauge 4 conductor) SOOW cable. It is recommended that the wire connections be made with spade terminals. If spade terminals are not used then the wires should not be twisted prior to connecting to the screw terminals. All strands of the wires need to be tightened to the terminal with no fraying. The cable should be secured with the strain relief clamp.

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E7

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Communication failure.

Disconnect power to outdoor unit for 1 minute. Does issue return after 3 minutes?

Yes Back No

E7

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Communication failure.

Is the LED on the outdoor PCB flashing?

Yes Back No

E7

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Communication failure.

Is the LED on the indoor PCB flashing?

Yes Back No

E7

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Communication failure.

Check wires and wire connections.

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E7

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Communication failure.

Check wires and wire connections.

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E7

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Communication failure.

Replace outdoor PCB

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E7

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Communication failure.

Replace outdoor PCB

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F39

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Open High Pressure Switch

Is high pressure switch connected to main board

Yes No

F39

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Open High Pressure Switch

Unplug connector. Is pressure switch open?

Yes Back No

F39

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Open High Pressure Switch

Is system pressure higher than switch open limit?

Yes Back No

F39

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Open High Pressure Switch

Remove limit switch. Does the switch close?

Yes Back No

F39

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Open High Pressure Switch

Are the indoor coils heating/cooling?

Yes Back No

F39

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Open High Pressure Switch

Replace EEV coil.

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F39

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Open High Pressure Switch

Is the outdoor unit installed too close to walls or are the coils blocked?

Yes Back No

F39

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Open High Pressure Switch

Fix install or clean coil.

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F39

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Open High Pressure Switch

Reconnect.

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F39

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Open High Pressure Switch

Replace PCB.

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F39

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Open High Pressure Switch

Replace limit switch.

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F39

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Open High Pressure Switch

Replace limit switch.

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F39

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Open High Pressure Switch

Is EEV coil out of position or have an open coil?

Yes Back No

F39

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Open High Pressure Switch

Replace PCB.

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F39

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Open High Pressure Switch

Recover and recharge system.

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F3

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Outdoor internal communication error

This error occurs when the outdoor PCB looses communication with the Inverter Power module (IPM).

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F3

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Outdoor internal communication error

Is the communication wire connected properly onto CN11 on IMP board and CN24 on PCB?

Yes Back No

F3

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Outdoor internal communication error

Is the low volt wire connected properly onto CN10 on IMP board and CN23 on PCB?

Yes Back No

F3

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Outdoor internal communication error

Unplug CN10 on IPM. Is there 5VDC on wires at pins 1-2 and 15VDC on wires at pins 2-3?

Yes Back No

F3

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Outdoor internal communication error

Replace IPM.

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F3

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Outdoor internal communication error

Fix connection.

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F3

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Outdoor internal communication error

Fix connection.

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F3

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Outdoor internal communication error

Replace PCB

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