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Troubleshooting
Service manual
31
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3.11 E3-20-21-22 – Jumper open on main PCB
Main error code
Sub error code
Unit
E3
20
Main
21
Sub 1
22
Sub 2
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
Reset
X4A jumper on main PCB
open.
Unit will stop operating.
Ensure X4A jumper is
inserted.
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
Possible cause:
Open jumper X4A on main PCB.
2
Perform a check of the high pressure switch. See
270].
Possible cause:
Faulty high pressure switch.
3
Perform a check of the main PCB. See
290].
Possible cause:
Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.12 E4-01-02-03 – Low pressure error
Main error code
Sub error code
Unit
E4
01
Main
02
Sub 1
03
Sub 2
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.
Summary of Contents for VRV IV+
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