Daikin VRV IV+, Service Manual

Page: 345 / 476

3 | Components
Service manual
345
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Blown fuse on the Sub PCB? Action
No Return to "3.20.1 Checking
procedures" [
4
342] of the Sub PCB and
continue with the next procedure.
To check the varistor of the Sub PCB
Prerequisite: First perform all earlier checks of the Sub PCB, see "3.20.1 Checking
procedures" [
4
342].
1 Measure the resistance of the varistor. If the reading is nearly infinite, the
varistor is still good.
a
a Varistor F1S
Varistor on Sub PCB broken? Action
Yes Replace the Sub PCB, see "3.20.2 Repair
procedures" [
4
345].
No Return to "3.20.1 Checking
procedures" [
4
342] of the sub PCB and
continue with the next procedure.
Problem solved?
After all checking procedures listed above have been performed:
Is the problem solved? Action
Yes No further actions required.
No Return to the troubleshooting of the
specific error and continue with the
next procedure.
3.20.2 Repair procedures
To correct the wiring from the main power supply terminal to the Sub PCB
Prerequisite: Stop the unit operation via the central controller.
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see "3.15 Plate work" [
4
315].
2 Make sure that all wires are firmly and correctly connected, see "6.2 Wiring
diagram" [
4
385].
3 Check the continuity of all wires.
4 Replace any damaged or broken wires.
Is the problem solved? Action
Yes No further actions required.