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Troubleshooting
Service manual
35
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Possible cause:
Clogged refrigerant circuit.
3
Perform a check of the oil return valve Y11S. See
Possible cause:
Faulty oil return valve Y11S .
4
Perform a check of the oil return valve Y12S. See
Possible cause:
Faulty oil return valveY12S.
5
Check if there are oil traps in the field piping. See installation manual for
piping rules.
Possible cause:
Compressor running without oil will draw higher current and
get locked.
6
Perform a check of the compressor. See
221].
Possible cause:
Faulty compressor.
7
Check liquid back issue. Check expansion valve operation. See
Possible cause:
Expansion valve CANNOT keep minimum superheat of 3 K
while running as evaporator.
8
Check if the refrigerant circuit is correctly charged. See
Possible cause:
Refrigerant shortage.
9
Perform a check of the 4‑way valve. See
Possible cause:
Faulty 4‑way valve.
10
Perform
a
check
of
the
discharge
pipe
thermistor.
See
348].
Possible cause:
Faulty discharge pipe thermistor or connector fault.
11
Perform a check of the inverter PCB A6P. See
Possible cause:
Faulty inverter PCB A6P.
12
Perform a check of the main PCB. See
290].
Possible cause:
Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.15 E6-17-19-21 – Inverter overcurrent error
Main error code
Sub error code
Unit
E6
17
Main
19
Sub 1
21
Sub 2
Summary of Contents for VRV IV+
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