Daikin VRV IV+ Service Manual page 30

2 | Troubleshooting
2.3.10 E3-18 – Actuation of high pressure switch during test run
Service manual
30
Trigger
High pressure switch is
activated during test run.
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 Perform a check of the high pressure switch. See
4
switch" [ 270].
Possible cause: Faulty high pressure switch.
3 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 363].
Possible cause: Refrigerant overcharge.
4 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.
5 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
6 Perform a check of the condenser side expansion valve. See
4
valve" [ 244].
Possible cause: Faulty condenser side expansion valve.
7 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.
Effect
Unit will stop test run.
4
363].
"4.2 Refrigerant circuit" [
"4.2 Refrigerant
"3.11 Main
Reset
If field setting 2-15=1
(default): Via the indoor
unit remote controller,
cycle OFF & ON.
If field setting 2-15=0:
Press BS3 on main PCB on
outdoor unit, and then via
indoor unit remote
controller, cycle OFF &
ON.
"3.9 High pressure
"4.2 Refrigerant
4 363].
4
circuit" [
"3.7 Expansion
4
PCB" [ 290].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
363].