System; U5-00" - Transmission User Interface Pcb Abnormality; U8-00" - Main-Sub Control Error - Daikin Modular L Smart Service Manual

ESIE19-06 | Part 2. Troubleshooting

2.2.2. System

2.2.2.1. "U5-00" – Transmission user interface PCB abnormality
Trigger
Main PCB A1P detects abnormal/missing
transmission to user interface for a certain
time.
Possible cause
Faulty main PCB.
Faulty user interface.
User interface is not detected anymore
since power was connected.
External factor (e.g. electrical noise) (error
disappears after power reset, but returns
after a while).
2.2.2.2. "U8-00" – Main-Sub control error
Trigger
Main PCB A1P detects abnormal/missing
transmission to dual interfaces.
Possible cause
Combination of 1 or 2 user interfaces
does not correspond to the Main-Sub set-
ting on the interfaces.
Faulty user interface.
Faulty main PCB.
Faulty user interface.
External factor (e.g. electrical noise) (error
disappears after power reset, but returns
after a while).
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Modular L Smart
Effect
Unit will stop operating.
Check
Check if the main PCB receives power.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check the wiring to main PCB.
Check voltage P1P2 ±16 VDC.
Check user interface.
Check the wiring between main PCB and
user interface.
Check for source which could cause elec-
trical interference.
Effect
Unit will stop operating.
Check
Check the setting of the Main and Sub
control setting.
Check wiring P1P2 between main PCB
and interface(s).
Check voltage P1P2 ±16 VDC.
Check user interface.
Check if the main PCB receives power.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check the wiring to main PCB.
Check voltage P1P2 ±16 VDC.
Check user interface.
Check for source which could cause elec-
trical interference.
2.2. Error based troubleshooting
Reset
Automatic reset.
Corrective action
Adjust power to the main PCB.
Replace main PCB when HAP LED is not
blinking in regular intervals.
Install correct spare part or update main
PCB.
Adjust wiring to main PCB when required.
Replace user interface when required.
When user interface is required, (re-) con-
nect user interface to main PCB terminals
P1P2.
When user interface is not further
required, reset power of HRV unit.
Avoid electrical interference.
Reset
Power reset.
Corrective action
When only 1 interface is connected,
ensure set to "Main".
When 2 user interfaces are connected,
ensure 1st user interface set to "Main",
2nd user interface set to "Sub".
Replace user interface when required.
Adjust power to the main PCB.
Replace main PCB when HAP LED is not
blinking in regular intervals.
Install correct spare part or update main
PCB.
Adjust wiring to main PCB when required.
Replace user interface when required.
Avoid electrical interference.
21/01/20 | Version 1.1