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Error Codes: System Malfunctions
ESIE05-04
3–46
Part 3 – Troubleshooting
3
1
3
4
5
3.2
Malfunction of Transmission between Indoor and Outdoor Unit (
U4
or
UF
)
Error code
U4
or
UF
Error generation
The error is generated when the microprocessor detects that the transmission between the indoor and
the outdoor unit is not normal over a certain amount of time.
Causes
The possible causes are:
Q
Wiring indoor-outdoor transmission wire is incorrect
Q
Malfunctioning indoor unit PCB
Q
Malfunctioning outdoor unit PCB
Q
Outside cause (noise...).
Troubleshooting 1
Diagnosis of incorrect or broken/disconnected wiring. If the LEDs on the indoor unit PC board are off,
it indicates that the transmission wiring between indoor and outdoor units may be incorrect or
broken/disconnected.
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Turn
the
power
supply
off
once
and
then
back
on.
Check
of
indoor
unit
microcomputer
normal
HAP
Check
of
indoor
unit
transmission
malfunction
HBP
Failure
of
indoor
unit
PCB
or
malfunction
of
power
supply
system.
Resets
normally.
Could
be
outside
cause
(noise...).
Failure
of
indoor
unit
PCB.
Wire
correctly.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
(OFF)
NO
(ON
or
OFF)
To
outdoor
unit
(next
page)
Is
HAP
flashing?
Is
HAP
flashing?
Is
indoor-outdoor
transmission
wire
connected
correctly?
Does
outdoor
unit
microcomputer
normal
H1P
flash?
Is
H2P
on?
Is
H1P
flashing?
Содержание FHQ100BUV3B
Страница 1: ...Service Manual ESIE05 04 R 410A Sky Air Indoor...
Страница 2: ......
Страница 20: ...ESIE05 04 1 2 Part 1 System Outline 3 1 1 5...
Страница 62: ...General Outline ESIE05 04 1 44 Part 1 System Outline 3 1 1 4 5...
Страница 78: ...ESIE05 04 1 60 Part 1 System Outline...
Страница 112: ...Wiring Diagrams ESIE05 04 1 94 Part 1 System Outline 3 1 1 4 5...
Страница 140: ...ESIE05 04 2 2 Part 2 Functional Description 3 1 2 5...
Страница 164: ...ESIE05 04 3 2 Part 3 Troubleshooting 3 1 3 5...
Страница 206: ...Error Codes ESIE05 04 3 44 Part 3 Troubleshooting 3 1 3 4 5...
Страница 224: ...Additional Checks for Troubleshooting ESIE05 04 3 62 Part 3 Troubleshooting 3 1 3 4 5...
Страница 226: ...ESIE05 04 4 2 Part 4 Commissioning and Test Run 3 1 4 5...
Страница 252: ...ESIE05 04 5 2 Part 5 Disassembly and Maintenance 3 1 5...
Страница 384: ...Disassembly and Maintenance ESIE05 04 5 134 Part 5 Disassembly and Maintenance 3 1 5 5...
Страница 390: ...ESIE05 04 vi Index 3 1 4 5 W Wiring diagrams Indoor units k 1 61...