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Error Codes: System Malfunctions
ESIE05-03
3–98
Part 3 – Troubleshooting
3
1
3
4
5
4.3
Malfunction of Transmission between Indoor Unit and Remote Controller (
U5
)
Error code
U5
Error generation
The error is generated when the microprocessor detects that the transmission between the indoor unit
and the remote controller is not normal over a certain amount of time.
Causes
The possible causes are:
P
Malfunctioning remote controller
P
Malfunctioning indoor PCB
P
Outside cause (noise...)
P
Connection of two master remote controllers (when using two remote controllers).
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Set one of the remote
controllers to SUB, turn off
the power supply
temporarily, then restart
operation.
Indoor unit PCB
replacement.
Malfunction could be
produced by noise. Check
the surrounding area and
restart operation.
Change to
double-core
independent cable.
Control by 2 remote
controllers
All
indoor unit
PCB microcomputer
normal monitors
flashing
Using
multicore
transmission wiring
between indoor unit
and remote
controller
Failure of remote
controller PCB or
replacement of defective
indoor unit PCB.
Problem could be caused
by external factor (noise
etc.) other than
malfunction.
Is "U5" displayed
constantly?
SS1 of both
remote controllers is
set to MAIN.
Resets
normally when
power supply is turned
off temporarily.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
ESIE05-03.book Page 98 Wednesday, April 6, 2005 4:09 PM
Summary of Contents for RZQ100B7W1B
Page 1: ...Service Manual ESIE05 03 RZQ71 125B8V3B RZQ100 140B7W1B Sky Air Inverter R 410A B series...
Page 2: ......
Page 10: ...ESIE05 03 viii Table of Contents 3 1 4 5...
Page 24: ...ESIE05 03 1 2 Part 1 System Outline 3 1 1 5...
Page 32: ...General Outline Outdoor Units ESIE05 03 1 10 Part 1 System Outline 3 1 1 4 5...
Page 42: ...Specifications ESIE05 03 1 20 Part 1 System Outline 3 1 1 4 5...
Page 56: ...Functional Diagrams ESIE05 03 1 34 Part 1 System Outline 3 1 1 4 5...
Page 58: ...ESIE05 03 1 36 Part 1 System Outline...
Page 70: ...Wiring Diagrams ESIE05 03 1 48 Part 1 System Outline 3 1 1 4 5...
Page 84: ...PCB Layout ESIE05 03 1 62 Part 1 System Outline 3 1 1 4 5...
Page 86: ...ESIE05 03 2 2 Part 2 Functional Description 3 1 2 5...
Page 110: ...General Functionality ESIE05 03 2 26 Part 2 Functional Description 3 1 2 4 5...
Page 150: ...ESIE05 03 3 2 Part 3 Troubleshooting 3 1 3 5...
Page 188: ...Troubleshooting ESIE05 03 3 40 Part 3 Troubleshooting 3 1 3 4 5...
Page 264: ...Additional Checks for Troubleshooting ESIE05 03 3 116 Part 3 Troubleshooting 3 1 3 4 5...
Page 266: ...ESIE05 03 4 2 Part 4 Commissioning and Test Run 3 1 4 5...
Page 306: ...ESIE05 03 5 2 Part 5 Disassembly and Maintenance 3 1 5...