Daikin VRV IV+ Service Manual page 26

2 | Troubleshooting
Service manual
26
Trigger
High pressure switch
opens due to high
pressure >safety value,
"6.6 Safety
4
devices" [ 449].
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 the required space around the outdoor unit heat exchanger. See
"4.3 External factors" [
Possible cause: Insufficient air flow or air by‑pass due to required space
specifications not met.
3 Clean the outdoor heat exchanger. See "5 Maintenance" [
Possible cause: Dirty outdoor heat exchanger.
4 Perform a check of the high pressure switch. See
4
switch" [ 270].
Possible cause: Faulty high pressure switch.
5 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 363].
Possible cause: Refrigerant overcharge.
6 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.
7 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
8 Perform a check of the condenser side expansion valve. See
4
valve" [ 244].
Possible cause: Faulty condenser side expansion valve.
9 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
Effect
Unit will stop operating.
4
363].
4
372].
"4.2 Refrigerant circuit" [
"3.11 Main
Reset
If field setting 2-15=1
(default): When pressure
drops below the reset
value, via the indoor unit
remote controller, cycle
OFF & ON.
If field setting 2-15=0:
When pressure drops
below the reset value,
press BS3 on main PCB on
outdoor unit, and then via
indoor unit remote
controller, cycle OFF &
ON.
4
374].
"3.9 High pressure
"4.2 Refrigerant
4
363].
"4.2 Refrigerant circuit" [
"3.7 Expansion
4
PCB" [ 290].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
4
363].