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
board.
PIPING
ROOM CARD
FLOAT
TEMP
SENSOR
SWITCH
WIRED
CONTROLLER
CN19
CN1
CN11
87654321
87654321
OFF
OFF
ON
ON
SW1(BM1)
SW3(BM3)
CN14
CN4
WiFi
MODULE
M
LOUVER
.
STEP MOTOR4
CN4
CN6
CN7
M
LOUVER
CN3
STEP MOTOR3
NOTE:
1.DASHED PARTS ARE OPTIONAL.
I.R .RECEIVER
2.USER SHOULD NOT CHANGE THE
(WITH DIGITAL
DISPLAY)
DIP SWITCH SW1 SW3 WITHOUT GUIDENCE
INTELLIGENT
3.SW3-5->SW3-8 ARE USED FOR WIRED CONTROLLER
MOVE EYE DEVICE
ADRESS SELECT. SW3-1->SW3-4 ARE RESERVED.
CAPACITY
SW1-1
SW1-2 SW1-3
(BTU/H)
ON
ON
OFF
24000
SW1-4
SW1-5 COOL HEAT
Room card
ON
OFF
ON
36000
ON
available
ON
ON
ON
ON
42000
ON
48000
OFF
unavailable
OFF
ON
ON
0150516956U
DC FAN MOTOR
M
FRESH AIR MOTOR /
.
.
ROOM
EXTERNAL ALARM OUTPUT
.
TEMP
(FUNCTION IN FUTURE )
SENSOR
( Contact rating_230VAC,3A)
CN10
M
CN9
CN3
CH1
CN6
ELECTRIC HEATING TERMINAL
CN8
RATING_230VAC,3A
INDOOR UNIT
CONNECT TO THIRD PARTY RELAY
MAIN CONTROL
BOARD
CN15
ELECTRIC HEATING
FUSE
THERMOSTAT / FUSE
CN13
L
T5A 250VAC
CN16
N
BLK
WHT
M
LOUVER STEP
2
1
MOTOR2
CN2
M
LOUVER STEP
CN1
MOTOR1
INDOOR UNIT
TERMINAL BLOCK
TO OUT DOOR UNIT
Y/G:YELLOW/GREEN
RD:RED WHT:WHITE
BLK:BLACK
******************
I.R .RECEIVER :
INFRARED REMOTE
RECEIVER .
SW1-6 SW1-7 SW1-8
TYPE DEFINE
COOL ONLY
TEMP.:TEMPERATURE
OFF OFF
Cassette
(SLIM)
OFF
HEAT PUMP
LARGE 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
DRAIN
PUMP
board.

Testing Communication Circuit

RD
Y/G
If an Error E7 occurs, perform the following test to determine
3
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.
1. Measure the DC voltage between terminals 1 and 3 on the
indoor terminal block.
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.
E-7

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