Daikin VRV IV+ Service Manual page 67

2.3.43 F6-01 – Refrigerant overcharge detection by high pressure sensor S1NPH
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Possible cause: If liquid pipe temperature is close to evaporation temperature
or flow is detected by expansion valve stethoscope then indoor unit
expansion valve is bleeding while closed. Faulty indoor unit expansion valve.
4 Perform a check of the indoor unit fan motor. See service manual of the
respective indoor unit(s).
Possible cause: Faulty indoor unit fan motor.
5 Perform a check of the indoor unit air and pipe thermistors. See service
manual of the respective indoor unit(s) for more information.
Possible cause: Faulty thermistor.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Discharge superheat
<10˚C (SH =T
Discharge Discharge
T ) during test run.
condensation
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 "3.21 Thermistors" [
Possible cause: Faulty ambient air thermistor.
2 Perform a check of the main refrigerant liquid thermistor. See
"3.21 Thermistors" [
Possible cause: Faulty main refrigerant liquid thermistor or connector fault.
3 Perform a check of the de–icer thermistor. See "3.21 Thermistors" [
Possible cause: Faulty de–icer thermistor or connector fault.
4 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 363].
Possible cause: Refrigerant overcharge.
5 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
Effect
Unit will stop running.
−
4
348].
"4.2 Refrigerant circuit" [
2 Troubleshooting
|
Reset
Manual reset via user
interface.
4
348].
"4.2 Refrigerant
4
363].
Service manual
4
348].
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