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5 Commissioning
Installation manual
11
AZQS100~14 AZQS100~140B7Y1B
Split system air conditioners
4P385528-1C – 2016.10
Error code
Possible cause
U0
The stop valves are closed.
U2
▪ There is a voltage imbalance.
▪ There is a missing phase in case of
three-phase power supply units.
Note:
Operation will be impossible. Turn OFF
the power, recheck the wiring, and switch
two of the three electrical wires.
U4 or UF
The inter-unit branch wiring is not correct.
UA
The outdoor and indoor unit are
incompatible.
NOTICE
▪ The reversed phase protection detector of this product
only
functions
when
the
product
starts
up.
Consequently reversed phase detection is not
performed during normal operation of the product.
▪ The reversed phase protection detector is designed to
stop the product in the event of an abnormality when
the product is started up.
▪ Replace two of the three phases (L1, L2, and L3)
during reverse-phase protection abnormality.
Summary of Contents for AZQS100B7Y1B
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