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Haier 2U18MS2VHB Service Manual page 128

Ductless multi-split heat pump, outdoor/indoor, wall mount - highwall, 2'x2' compact cassette, 3'x3' large cassette, slim duct, mid-static ducted, medium static ducted, console
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When the system generates an error code, it will be displayed on the Service Monitor Board, the number of flashes on the PCB,
and also on the indoor unit display panel.
Temperature 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 or shorted, 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 located in the tables.
There are 16 potential Error Codes that can be generated by the PCB to indicate a failure of an outdoor unit temperature sensor.
Error Code 10
This code indicates an electrical failure of the sensor that is
used to sense the temperature of the outdoor coil during
defrost. This sensor is connected to the PCB 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 PCB 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 PCB 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 PCB via two
wires at Plug CN-14.
J-16
Outdoor Unit Error Codes
These codes indicate a failure of either a Liquid or Gas
Temperature Sensor that is part of either the A, B, C, or
D indoor unit EEV circuit. Refer to the outdoor unit Error
Code Decal for specific identification of the malfunctioning
temperature sensor. These sensors connect to the PCB 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.)
This code indicates a potential failure of the IPM temperature
sensor. This sensor connects to the IPM via Plug CN-8. This
sensor is mounted near the heat sink.
This code indicates an electrical failure of the sensor that is
used to sense the condensing temperature of the outdoor
coil. The sensor is connected to the PCB via two wires at Plug
CN-14.
This code indicates an electrical failure of the 'Toci' sensor,
which ensures there is no drop in hot gas temperature
through the 4-way valve. The sensor is connected to the PCB
via two wires at Plug CN-7.
TROUBLESHOOTING & REFERENCES
Error Code 28-36
Error Code 38
Error Code 39
Error Code 41

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