Daikin VRV IV+ Service Manual page 34

2 | Troubleshooting
2.3.14 E5-07-08-09 – Compressor overload/Motor Lock Error (M2C)
Service manual
34
7 Check liquid back issue. Check expansion valve operation. See
4
valve" [ 244].
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
4
circuit" [ 363].
Possible cause: Refrigerant shortage.
9 Perform a check of the 4‑way valve. See
Possible cause: Faulty 4‑way valve.
10 Perform a check
"3.21 Thermistors" [
Possible cause: Faulty discharge pipe thermistor or connector fault.
11 Perform a check of the inverter PCB A3P. See
Possible cause: Faulty inverter PCB A3P.
12 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Main error code
E5
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
Compressor overload is
detected for M2C.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check that all stop valves of the refrigerant circuit are open. See
"4.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
2 Check if the refrigerant circuit is clogged. See
"3.1 4-way
of the discharge
4
348].
"3.11 Main
Sub error code
07
08
09
Effect
Unit will stop operating.
4
363].
"3.7 Expansion
"4.2 Refrigerant
4
valve" [ 206].
pipe thermistor.
4
"3.10 Inverter PCB" [ 274].
4
PCB" [ 290].
Unit
Main
Sub 1
Sub 2
Reset
Manual reset via user
interface.
"4.2 Refrigerant circuit" [
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
See
4
363].