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ERROR CODES

PAGE 29

ENGLISH

Error Code 10

This code indicates an electrical failure of the sensor that is
used to sense the temperature of the outdoor coil during
heat mode operation. This sensor is connected to the ECU via
a connection at Plug CN-14.

Error Code 11

This code indicates an electrical failure of the sensor that is
used to sense the temperature of the suction gas that enters
the compressor. The sensor is connected to the ECU via two
wires at Plug CN-14.

Error Code 12

This code indicates an electrical failure of the sensor that is
used to sense the temperature of the outdoor air. The sensor
is connected to the ECU via two wires at Plug CN-14.

Error Code 13

This code indicates an electrical failure of the sensor that is
used to sense the temperature of the compressor hot gas
discharge line. The sensor is connected to the ECU via two
wires at Plug CN-14.

Error Code 28-36

All of these codes indicate a failure of either a Liquid or Gas
Temperature Sensor that is part of either the A, B, C, or D
EEV circuit. Refer to the outdoor unit Error Code Decal for
specific identification of the malfunctioning temperature
sensor. These sensors connect to the ECU at connection

plugs near the center of the circuit board. (Note that if the
sensor has failed, and there is an unused port on the unit
available, the sensor from the unused port can be used to
temporarily fix the problem.)

Error Code 38

This code indicates a potential failure of the MODULE Board
temperature sensor. This sensor connects to the ECU via
Plug CN-14. This sensor is mounted near the heat sink
attached to the circuit board. A momentary power outage
where the sensor has cooled may also trigger this error code.
Test the sensor. If it tests go Outdoor Unit Pressure Switch
Malfunction Codes

There are two pressure switches in the outdoor unit, a low
pressure switch and a high pressure switch. They connect to
the ECU via plugs CN-12 and CN-13. The low pressure switch
is connected at CN-12 and the high pressure switch at CN-
13. A low pressure error will generate an Error Code 44. A high
pressure error will generate an Error Code 45.

Error Code 39

This code indicates an electrical failure of the sensor that is
used to sense the temperature of the outdoor coil. The sen

sor is connected to the ECU via two wires at Plug CN-14.

Error Code 41

This code indicates an electrical failure of the sensor that is
used to sense the temperature of the refrigerant entering or
leaving the outdoor coil. The sensor is connected to the ECU
via two wires at Plug CN-7.

Outdoor Unit Error Codes

If the ECU generates a system ERROR CODE, the code will be
displayed on the outdoor unit numeric display. Additionally,
error codes generated by the outdoor unit will be displayed
on the indoor unit circuit boards. The codes displayed on the
indoor unit circuit boards will be represented by flash codes
on LED indicators. The error codes displayed on the indoor
unit consumer display will not match the outdoor unit code
numbers. When performing diagnostic service, it will be nec

essary at times to use both codes to solve problems.

Sensor Error Codes

The easiest problems to solve will involve codes that are
related to potential failure of temperature sensors. Common
problems may include loose connections, open electrically,
and out of calibration. Checking the condition of the sensors
requires a temperature probe and an ohmmeter.

The Reference Section of this manual contains temperature
resistance tables that can be used to check the calibration
of the sensors. The measured resistance must be within the
tolerances printed on the top of the tables.

Testing Procedure (See temperature sensor testing on page
18)

To test the electrical condition of a temperature sensor per

form the following:

Confirm the sensor is firmly attached to the circuit

board connection plug.

Remove the sensor wires from the connection plug

by releasing holding tension on the plugs tension tab.

Use an ohmmeter to test the electrical resistance of

the sensor.

If the sensor is within calibration, the sensor is good.

If the sensor is out of calibration, replace the sensor.

There are 15 potential Error Codes that can be generated by the ECU to indicate a failure of an outdoor unit temperature