Daikin VRV IV Series - Page 130

22 | Troubleshooting
Installer and user reference guide
130
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Main code Sub code Cause Solution
Warning: faulty wiring to Q1/Q2 Check Q1/Q2 wiring. Do NOT use Q1/
Q2.
Malfunction code: faulty wiring to Q1/
Q2
Check Q1/Q2 wiring. Do NOT use Q1/
Q2.
▪ Too many indoor units are connected
to F1/F2 line
▪ Bad wiring between outdoor and
indoor units
Check indoor unit amount and total
capacity connected.
▪ System mismatch. Wrong type of
indoor units combined (R410A,
R407C, RA, etc). Indoor unit
malfunction
▪ Heat exchanger unit malfunction
▪ Check if other indoor units have
malfunction and confirm indoor unit
mix is allowed.
▪ Check the transmission wiring to the
heat exchanger unit.
More than 1 heat exchanger unit
connected.
Check installation. Only 1 heat
exchanger unit can be installed.
▪ Improper type of indoor units are
connected.
▪ Mismatch of compressor unit and
heat exchanger unit.
▪ Check the type of indoor units that
are currently connected. If they are
not proper, replace them with proper
ones.
▪ Check if the compressor unit and heat
exchanger unit are compatible.
5HP heat exchanger unit connected. Check installation. Connect 8HP heat
exchanger unit.
▪ Auto address malfunction
(inconsistency)
▪ Mismatch of compressor unit and
heat exchanger unit.
▪ Check if transmission wired unit
amount matches with powered unit
amount (by monitor mode) or wait till
initialisation is finished.
▪ Check if the compressor unit and heat
exchanger unit are compatible.
▪ Auto address malfunction
(inconsistency)
▪ Mismatch of compressor unit and
heat exchanger unit.
▪ Check if transmission wired unit
amount matches with powered unit
amount (by monitor mode) or wait till
initialisation is finished.
▪ Check if the compressor unit and heat
exchanger unit are compatible.
▪ The stop valves of the compressor
unit are left closed.
▪ The piping and wiring of the specified
indoor unit or heat exchanger unit are
not connected correctly to the
compressor unit.
▪ Open the stop valves on both the gas
and liquid side.
▪ Confirm that the piping and wiring of
the specified indoor unit or heat
exchanger unit are connected
correctly to the compressor unit.