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Troubleshooting
Service manual
177
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
NOTICE
Other indoor units in the circuit will show U9 Error. This means "There is an error in
the circuit but it is not the unit that shows U9".
3
Check total index and total count for indoor units. See Data book on Business
Portal for more information.
Possible cause:
Indoor Unit capacity connected is too high.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.183 UA-30 – Combination Abnormality - Heat Pump and Heat Recovery Outdoor Units
Detected in Same Combination
Trigger
Effect
Reset
Heat Pump and Heat
Recovery Type outdoor
units are detected
together on Q1-Q2 wiring.
Unit will stop operating.
Power reset at outdoor
unit.
To solve the error code
1
Check outdoor units on the same Q1‑Q2 wiring. Heat Pump and Heat
Recovery type outdoor units cannot be present on the same circuit.
Possible cause:
Heat Pump and Heat Recovery type units on same circuit.
2.3.184 UA-31 – Combination abnormality - REMQ-U Unit Detected Without a Multi Combination
Trigger
Effect
Reset
More than 3 outdoor
units are detected on Q1-
Q2 transmission line.
Forced stop.
Power reset at outdoor
unit.
REMQ Unit detected
without a multi
combination.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Maximum 3 outdoor units are allowed in the installation. Change the
installation if needed.
2
Check the Q1‑Q2 communication between the outdoor units. See
356].
Possible cause:
Faulty or interruption in communication between outdoor
units.
3
REMQ Units are only allowed in multi combination as REMQ5U or
REMQ5U.
Summary of Contents for VRV IV+
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