E3-18 - Actuation Of High Pressure Switch During Test Run; E3-20-21-22 - Jumper Open On Main Pcb; E4-01-02-03 - Low Pressure Error - Daikin VRV IV+ Service Manual

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Possible cause: Closed stop valve in the refrigerant circuit.
2 Perform a check of the refrigerant high pressure sensor. See
"3.15 Refrigerant high pressure sensor" on
Possible cause: Faulty refrigerant high pressure sensor.
3 Check if the refrigerant circuit is correctly charged. See
"4.2 Refrigerant circuit" on page 133.
Possible cause: Refrigerant overcharge.
4 Check for the presence of non‑condensables and/or humidity in
the refrigerant circuit. See "4.2 Refrigerant circuit" on
Possible cause: Non‑condensables and/or humidity in the
refrigerant circuit.
5 Check if the refrigerant circuit is clogged. See
circuit" on page 133.
Possible cause: Clogged refrigerant circuit.
6 Perform a check of the condenser side expansion valve. See
"3.5 Expansion valve" on page 89.
Possible cause: Faulty condenser side expansion valve.
7 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.9 E3-18 – Actuation of high pressure switch
during test run
Trigger Effect
High pressure switch Unit will stop test run. If field setting 2-15=1
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" on
Possible cause: Closed stop valve in the refrigerant circuit.
2 Perform a check of the high pressure switch. See
pressure switch" on page 97.
Possible cause: Faulty high pressure switch.
3 Check if the refrigerant circuit is correctly charged. See
"4.2 Refrigerant circuit" on page 133.
Possible cause: Refrigerant overcharge.
4 Check for the presence of non‑condensables and/or humidity in
the refrigerant circuit. See "4.2 Refrigerant circuit" on
Possible cause: Non‑condensables and/or humidity in the
refrigerant circuit.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
page 124.
page 133.
"4.2 Refrigerant
"3.9 Main PCB" on
Reset
(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.
page 133.
"3.7 High
page 133.
5 Check if the refrigerant circuit is clogged. See
circuit" on page 133.
Possible cause: Clogged refrigerant circuit.
6 Perform a check of the condenser side expansion valve. See
"3.5 Expansion valve" on page 89.
Possible cause: Faulty condenser side expansion valve.
7 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.10 E3-20-21-22 – Jumper open on main PCB
Main error code Sub error code
E3 20
21
22
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 Effect
X4A jumper on main Unit will stop
PCB open. operating.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check that the bridge connector X4A of the main PCB is
correctly connected. See "3.9 Main PCB" on
Possible cause: Open jumper X4A on main PCB.
2 Perform a check of the high pressure switch. See
pressure switch" on page 97.
Possible cause: Faulty high pressure switch.
3 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.11 E4-01-02-03 – Low pressure error
Main error code Sub error code
E4 01
02
03
2 Troubleshooting
"4.2 Refrigerant
"3.9 Main PCB" on
Unit
Main
Sub 1
Sub 2
Reset
Ensure X4A jumper is
inserted.
page 106.
"3.7 High
"3.9 Main PCB" on
Unit
Main
Sub 1
Sub 2
Service manual
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