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Testing Louver Motors; Testing Communication Circuit - 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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Testing Louver Motors

If the louver does not operate with command from the remote
control, either the indoor board is bad, or the louver motor
is defective. It is more likely the motor is defective than the
board. (Make sure the louver assembly is not binding and
keeping the vanes from moving.)
1. Remove power from the unit and remove the indoor unit
cover.
2. Access the circuit board.
3. Identify the inoperable louver motor on the schematic
drawing below and disconnect the plug from the circuit
2014.11.29
board.
FLOAT
PIPING
SWITCH
TEMP.
ROOMCARD
PANNEL
SENSOR
CN21
CN1
CN19
87654321
87654321
ON
ON
OFF
OFF
BM3
BM1
CN11
CN4
CN13
REMOTE
U-HOME
CENTRAL
BM1-2 BM1-3 BTU
BM1-1
AB09SC2VHA/AB09CS2ERA
OFF
OFF
OFF
9000
AB12SC2VHA/AB12CS2ERA(S)
ON
OFF
OFF
12000
OFF
ON
OFF
18000
AB18SC2VHA/AB18CS2ERA(S)
ON
ON
OFF
24000
OFF
OFF
ON
28000
ON
OFF
ON
36000
BM1-4
BM1-5
Room card
OFF
ON
ON
48000
ON
OFF
available
ON
ON
ON
60000
unavailable
OFF
OFF
0150515406
ROOM
DC FAN
TEMP.
SENSOR
PUMP
CN9
CN3
CH1
CN6
CN8
FUSE
T5A/250VAC
CN16
CN35
N
W
B
R
1
2
3
UP/DOWN
TO OUT DOOR
R:RED
NOTE1.DASHED PART ARE OPTIONAL.
B:BLACK
2. USER SHOULD NOT TO SET BM1 AND BM3
W:WHITE
BM1-7 BM1-8
BM1-6
TYPE DEFINE
Y/G:YELLOW/GREEN
OFF
Default
OFF
OFF
COMPACT CASSETTE TECHNICAL OVERVIEW
Testing
4. Use an Ohmmeter to test the electrical continuity of the
louver motor windings. The proper resistance for each
winding can be found in this table. If the motor winding
resistance is erratic or shows open, the motor is defective.
Replace the motor.
5. If the motor checks out good, replace the indoor control
board.

Testing Communication Circuit

If an Error E7 occurs, perform the following test to determine
if the indoor control board is functioning properly to send data
to the outdoor unit.
Perform this test with the unit powered and all wiring
connected between indoor and outdoor unit.
Make sure all wiring between the indoor and outdoor unit
are correct. There should no splices between the indoor and
outdoor unit wiring connecting terminals 1 or 3. Make sure
wiring is correct, before performing this test.
G
1. Measure the DC voltage between terminals 1 and 3 on the
Y/G
indoor terminal block.
G
2. The voltage should fluctuate between 8VDC and 23VDC.
The fluctuating signal indicates a good communication
path.
3. If the voltage does not fluctuate, and the wiring is good,
the indoor board is defective.
D-7

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