Haier AW07EH2VHA, Service Manual

Page: 53 / 140

COMPACT CASSETTE TECHNICAL OVERVIEW
D-7
ENGLISH
TO OUT DOOR
0150515406
2014.11.29
BM1-1
BM1-7 BM1-8 TYPE DEFINE
OFF OFF
BM1-2 BM1-3 BTU
B:BLACK
R:RED
W:WHITE
Y/G:YELLOW/GREEN
TEMP.
SENSOR
ROOM
SENSOR
FLOAT
SWITCH
HEATER
PUMP
UP/DOWN
CN9
CN1
CN6
PANNEL
CN4
CN11
CN19
CN13
CN3
ON
CN 35
CN21
T5A/250VAC
FUSE
BM3
2 1 3
B W
R
Y/G
OFF OFF OFF
ON OFF OFF
OFF ON OFF
ON ON OFF
OFF OFF ON
ON OFF ON
OFF ON ON
ON ON ON
9000
12000
18000
24000
28000
36000
48000
60000
NOTE1.DASHED PART ARE OPTIONAL.
2. USER SHOULD NOT TO SET BM1 AND BM3
CH1
OFF OFF
BM1-4 BM1-5
BM1-6
OFF
OFF
CN16
G
CN8
G
TEMP.
PIPING
DC FAN
ROOMCARD
U-HOME
WIRED CONTROLLER
BA
C
BA
C
REMOTE
CENTRAL
87654321
ON
BM1
OFF
87654321
N
OFF
Room card
available
unavailable ON
AB09SC2VHA/AB09CS2ERA
AB12SC2VHA/AB12CS2ERA(S)
AB18SC2VHA/AB18CS2ERA(S)
Default
Testing
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.
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.
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.