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Outdoor Defrosting Temp. Sensor Te Abnormal; Suction Temp.sensor Ts Abnormal; Outdoor Ambient Temp. Sensor Ta Abnormal; Discharging Temp. Sensor Td Abnormal - Haier 2U18MS2VHB Service Manual

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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[10] Outdoor defrosting temp. sensor Te abnormal

[11] Suction temp.sensor Ts abnormal

[12] Outdoor ambient temp. sensor Ta abnormal

[13] Discharging temp. sensor Td abnormal

Sensor temperature has been detected below or higher than expected,
or the sensor has been detected as a shorted or open circuit.
(for expected temperature, refer to part failure code)
Possible causes:
• Bad sensor connection
• The sensor is bad
• Sensor resistance drift
• The temperature acquired by PCB is not accurate

[15] Communication abnormal between indoor unit and outdoor unit

Outdoor unit control board cannot communicate
with the indoor unit control board for over 4
minutes.
Possible causes:
• Bad communication wiring
• The PCB is bad
Flow Charts
Topic Title
Power off
Is the communication wire is
shorted?
Is the communication wire
CN21 is disconnected?
Is the wiring connection sequence
correct according to the wiring
diagram?
Power on
Measure the outdoor terminal block voltage
between communication 3 and N, and measure the
indoor terminal block between communication 3
and N to check. Is the communication wire ok?
Using a multimeter, measure the terminal
corresponding to the N-line voltage of CN21
from the indoor unit with the communication
failure. Is the voltage normal?
TROUBLESHOOTING & REFERENCES
Is the sensor wiring
firmly and correctly in
place?
Yes
Is the sensor
resistance within
range?
Yes
Is the temperature
loop acquired by
the computer board
normal?
Yes
No
Yes
No
No
Yes
No
Yes
No
No
Replace
sensor
No
Replace
sensor
Yes
Replace
it.
Replace wire
econnect
R
econnect
R
Replace the
communication wire
PCB is bad, replace PCB
J-23

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