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Troubleshooting
Service manual
70
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Possible cause:
Faulty indoor unit fan motor.
11
Perform
a
check
of
the
discharge
pipe
thermistor.
See
Possible cause:
Faulty discharge pipe thermistor or connector fault.
12
Perform a check of the refrigerant high pressure sensor. See
330].
Possible cause:
Faulty refrigerant high pressure sensor.
13
Perform a check of the indoor unit air thermistors. See service manual of the
respective indoor unit(s) for more information.
Possible cause:
Faulty indoor unit air thermistor(s).
14
Check all indoor units operation in heating mode. Check for room
temperatures below 20°C. Check if caution disappears once rooms heat‑up. If
NOT, continue checking the cause of the wet operation.
Possible cause:
Indoor room temperature too low when in heating mode. Too
cold rooms might create more subcool resulting in wet operation.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.45 F6-03 – Refrigerant overcharge detection by high subcool value
Trigger
Effect
Reset
Discharge superheat
<10˚C (SH
Discharge
=T
Discharge
−
T
condensation
) during test run.
Unit will stop running.
Manual reset via user
interface.
Excessive subcool is
detected from
comparison of R1T
ambient thermistor, R3T
liquid thermistor, R11T
de-icer thermistor to
saturated temperature
derived from high
pressure sensor S1NPH.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Perform a check of the outdoor air thermistor. See
Possible cause:
Faulty ambient air thermistor.
2
Perform a check of the main refrigerant liquid thermistor. See
Possible cause:
Faulty main refrigerant liquid thermistor or connector fault.
3
Summary of Contents for VRV IV+
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