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Troubleshooting
Service manual
91
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
Effect
Reset
Refrigerant liquid
thermistor R7T after
subcool heat exchanger
short/open circuit or out
of range.
Unit will stop operating.
Manual reset via user
interface.
Automatic reset when
thermistor read-out is
within range.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Perform a check of the refrigerant liquid thermistor of the subcool heat
exchanger. See
348].
Possible cause:
Faulty refrigerant liquid thermistor of the subcool heat
exchanger or connector fault.
2
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.
2.3.72 J8-01-02-03 – Upper heat exchanger liquid temperature thermistor R4T abnormality
Main error code
Sub error code
Unit
J8
01
Main
02
Sub 1
03
Sub 2
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
Effect
Reset
Upper heat exchanger
liquid temperature
thermistor R4T short/
open circuit or out of
range.
Unit will stop operating.
Manual reset via user
interface.
Automatic reset when
thermistor read-out is
within range.
Summary of Contents for VRV IV+
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