Daikin Modular L Smart, Service Manual

Page: 30 / 90

ESIE19-06 | Part 2. Troubleshooting 2.2. Error based troubleshooting
Page 30 21/01/20 | Version 1.1
Modular L Smart
2.2.2.5. “UE-00” – Transmission fault indoor-central control device
Trigger Effect Reset
Main PCB A1P does not detect anymore
the central control device. Unit keeps operating (only warning). Automatic.
Possible cause Check Corrective action
Communication interrupted:
• cable to central control device
disconnected, or
• no more power supply to central
control device.
Check voltage on F1F2 at central control
device (±16 VDC).
Check power supply to central control
device. Reconnect F1F2 wiring to central control
device.
Reconnect power supply to central control
device.
HRV unit has no more group number set. Check group number setting through user
interface. Set unique group number by user inter-
face.
Faulty main PCB. 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. 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.
External factor (e.g. electrical noise) (error
disappears after power reset, but returns
after a while). Check for source which could cause elec-
trical interference. Avoid electrical interference.