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8
Trouble diagnosis
8.1
Common error codes (PACi & ECOi)
Remote
Controller
Display
C17
E01
E02
E03
E04
E08
E09
E14
AHU Kit – Installation Instructions – 07/2023
Description
Detailed Explanation
Central Controller
Indoor unit does not respond to central control equipment.
Reception Error
Remote Controller
It is judged an error if no self-addressed communication is sent to the remote controller in a
Reception Error
3-minute period.
• When a remote controller is set to sub remote controller.
• When there are 9 or more indoor units in a remote control group's wiring.
• When the CHK (check pin) and / or TEST (test pin) on the AHU main control PC board (A1) are
short circuited.
• The nonvolatile memory (EEPROM) is not installed or faulty when turning on the power.
• AHU control PC board error.
• Remote controller check mode.
• Malfunctions of the remote controller itself (reception circuit error).
• No setting of system address, indoor unit address, indoor unit individualization / main / sub
(Auto address setting not completed.)
Remote Controller
When the remote controller itself cannot transmit. Or when it cannot receive the signal it transmitted
Transmission Error
itself, or when they are different and judged an error.
• Malfunction of the remote controller itself (transmit circuit error).
Error in AHU Unit
It is judged an error when there is no communication from any remote controller (collectively) in a
Receiving Signal from
3-minute period or if there is no communication from the central device in a 15-minute period.
Remote Controller
• When there was once communication, but during use the remote control wiring is opened or
(central)
miswired.
• The line to the central control unit for indoor / outdoor operations is opened.
• Settings are made only for sub remote controller.
• The power to the central control unit is not on and remote controllers are not being used (or the
inter-unit control wiring to the central control unit is opened).
• When remote controller are not being used, only the sub remote controller is set up.
Error in AHU Unit
When there is no communication within a 3-minute period from the outdoor unit. Or, judged an error
Receiving Signal from the
when no reply comes from the outdoor unit.
Outdoor unit
• The outdoor unit is not turned on.
• When the power was turned on after auto address setting was completed, the number of indoor
units had been changed.
• Forgot to turn on the AHU unit.
• The CHK pin and / or TEST pin on the AHU unit's control PC board are shorted.
• Forgot to install the nonvolatile memory (EEPROM) when replacing the AHU unit control PC
board.
• Mistakenly set the indoor unit address to Not Set in the remote control's detailed setting mode.
• When indoor unit addresses are duplicated.
• There is a short, open, wrong contact or grounding of the indoor / outdoor control line.
• There is an error in the receiving circuit on the signal output PC board (CZ-CAPBC2 PCB).
• Malfunctions of the outdoor unit
• The thermistor inside the AHU unit is grounded.
• The capacity setting is mismatched between AHU units and the outdoor unit.
• High voltage (AC230V, etc.) applied across indoor/outdoor operation wire circuit
Duplicate Indoor Unit
It is judged an error if the addresses of indoor units are duplicated.
Address Settings Error
• The indoor unit address settings are duplicated in the remote control detailed settings mode.
• The multiple unit DISP pin is shorted across the indoor unit whose address is Not Set.
More Than One Remote
It is judged an error when more than one remote controller in a remote control group is set as the
Controller Set to Main
main remote controller.
Error
• Forgot to set one remote controller to sub in a 2-remote control group.
• When using one wireless and one wired remote controller in a control group, forgot to set one of
them to sub.
Main Unit duplication in
It is judged an error the total capacity of indoor units replied by communication is lower than that of
Simultaneous-operation
outdoor unit.
Multi Control
• PACi: The total capacity of AHU unit(s) is lower than that of outdoor unit.
• Some AHU unit(s) are connected but power is not turned on.
• The CHK pin (CN062 / CN071) and / or TEST pin (CN064) of the AHU unit is shorted when its
power is turned on.
Trouble diagnosis
83
8
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