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Troubleshooting
Installer and user reference guide
131
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
Warning indication: Leak
detection or refrigerant
amount check not performed
(system operation possible)
Execute autocharge function
(see manual); unit not ready
for leak detection
functionality.
Malfunction code: System test
run not yet executed (system
operation not possible)
Execute system test run.
Faulty wiring to Q1/Q2 or
indoor - outdoor
Check (Q1/Q2) wiring.
Faulty wiring to Q1/Q2 or
indoor - outdoor
Check (Q1/Q2) wiring.
System test run abnormal
ending
Execute test run again.
Warning: faulty wiring to Q1/
Q2
Check Q1/Q2 wiring.
Malfunction code: faulty
wiring to Q1/Q2
Check Q1/Q2 wiring.
▪
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, Hydrobox,
etc)
Indoor unit malfunction
Check if other indoor units
have malfunction and confirm
indoor unit mix is allowed.
Connection malfunction over
indoor units or type mismatch
(R410A, R407C, RA, Hydrobox,
etc)
Check if other indoor units
have malfunction and confirm
indoor unit mix is allowed.
Connection malfunction over
indoor units or type mismatch
(R410A, R407C, RA, Hydrobox,
etc)
Check if other indoor units
have malfunction and confirm
indoor unit mix is allowed.
Wrong unit combination
(multi system)
Check if unit types are
compatible.
Wrong unit combination
(multi system)
Check if unit types are
compatible.
Auto address malfunction
(inconsistency)
Check if transmission wired
unit amount matches with
powered unit amount (by
monitor mode) or wait till
initialisation is finished.
