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Repair procedures

In document 1 General operation (сторінка 105-112)

3.10 Indoor unit power PCB

3.10.2 Repair procedures

No See "To check the power supply to the

indoor unit" ("4.1.2 Repair

procedures" [4 196]) for the next steps.

To perform an electrical check of the indoor unit power PCB

Prerequisite: First perform a power check of the indoor unit power PCB, see

"3.10.1 Checking procedures" [4 104].

1 Measure the voltage between the pins 1‑4 of the connector S102.

Result: The measured voltage MUST be 324 VDC.

A a

A Wall mounted indoor unit a Connector S102

a A

A Floor standing indoor unit a Connector S102

Is the measured voltage on the indoor unit power PCB correct?

Action

Yes Return to "3.10.1 Checking

procedures" [4 104] of the indoor unit power PCB and continue with the next procedure.

No Replace the indoor unit power PCB, see

"3.10.2 Repair procedures" [4 108].

To check if the correct spare part is installed

Prerequisite: First perform all earlier checks of the indoor unit main PCB, see

"3.10.1 Checking procedures" [4 104].

1 Visit your local spare parts webbank.

2 Enter the model name of your unit and check if the installed spare part number corresponds with the spare part number indicated in the webbank.

Is the correct spare part for the indoor unit power PCB installed?

Action

Yes Return to "3.10.1 Checking

procedures" [4 104] of the indoor unit power PCB and continue with the next procedure.

No Replace the indoor unit power PCB, see

"3.10.2 Repair procedures" [4 108].

To check the wiring of the indoor unit power PCB

Prerequisite: First perform all earlier checks of the indoor unit main PCB, see

"3.10.1 Checking procedures" [4 104].

Prerequisite: Stop the unit operation via the user interface.

Prerequisite: Turn OFF the respective circuit breaker.

1 Check that all wires are properly connected and that all connectors are fully plugged‑in.

2 Check that no connectors or wires are damaged.

3 Check that the wiring corresponds with the wiring diagram, see "6.2  Wiring diagram" [4 216].

INFORMATION

Correct the wiring as needed.

Is the problem solved? Action

Yes No further actions required.

No Return to "3.9.1 Checking

procedures" [4 98] of the indoor unit power PCB and continue with the next procedure.

To check the fuse of the indoor unit main PCB

Prerequisite: First perform all earlier checks of the indoor unit main PCB, see

"3.10.1 Checking procedures" [4 104].

1 Measure the continuity of the fuse. If no continuity is measured, the fuse has blown.

a A

A Wall mounted indoor unit a Fuse F1U

a A

A Floor standing indoor unit a Fuse F1U

Blown fuse on the indoor unit power PCB?

Action

Yes Replace the blown fuse, see

"3.10.2 Repair procedures" [4 108].

No Return to "3.9.1 Checking

procedures" [4 98] of the indoor unit power 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.

3.10.2 Repair procedures

To correct the wiring from the indoor unit power supply terminal to the indoor unit power PCB Prerequisite: Stop the unit operation via the user interface.

Prerequisite: Turn OFF the respective circuit breaker.

Prerequisite: Remove the required plate work, see "3.14 Plate work" [4 143].

1 Correct the wiring from the indoor unit power supply terminal to the indoor unit power PCB, see "6.2 Wiring diagram" [4 216].

Is the problem solved? Action

Yes No further actions required.

No Return to "3.9.1 Checking

procedures" [4 98] of the indoor unit power PCB and continue with the next procedure.

To remove the indoor unit power PCB

Prerequisite: Stop the unit operation via the user interface.

Prerequisite: Turn OFF the respective circuit breaker.

Prerequisite: Remove the required plate work, see "3.14 Plate work" [4 143].

1 Disconnect all connectors from the indoor unit power PCB.

2 Carefully click the indoor unit power PCB out of the PCB retainers.

A a

A Wall mounted indoor unit a Indoor unit power PCB

a A

A Floor standing indoor unit a Indoor unit power PCB

3 Remove the indoor unit power PCB from the indoor unit.

4 To install the indoor unit power PCB, see "3.10.2 Repair procedures" [4 108].

To install the indoor unit power PCB

1 Install the indoor unit power PCB in the correct location in the switch box.

Make sure the PCB is correctly fixed by the PCB retainers.

A a

A Wall mounted indoor unit a Indoor unit power PCB

a A

A Floor standing indoor unit a Indoor unit power PCB

2 Connect all connectors to the indoor unit power PCB.

INFORMATION

Use the wiring diagram and connection diagram for correct installation of the connectors, see "6.2 Wiring diagram" [4 216].

WARNING

When reconnecting a connector to the PCB, make sure to connect it on the correct location and do NOT apply force, as this may damage the connector or connector pins of the PCB.

Is the problem solved? Action

Yes No further actions required.

No Return to "3.9.1 Checking

procedures" [4 98] of the indoor unit power PCB and continue with the next

To remove a fuse of the indoor unit power PCB

Prerequisite: Stop the unit operation via the user interface.

Prerequisite: Turn OFF the respective circuit breaker.

Prerequisite: Remove the required plate work, see "3.14 Plate work" [4 143].

1 Remove the fuse from the PCB.

a A

A Wall mounted indoor unit a Fuse F1U

a A

A Floor standing indoor unit a Fuse F1U

2 To install a fuse on the indoor unit power PCB, see "3.10.2  Repair procedures" [4 108].

To install a fuse on the indoor unit power PCB

1 Install the fuse on the correct location on the PCB.

CAUTION

Make sure the fuse is plugged‑in correctly (contact with the fuse holder).

a A

A Wall mounted indoor unit a Fuse F1U

a A

A Floor standing indoor unit a Fuse F1U

Is the problem solved? Action

Yes No further actions required.

No Return to "3.9.1 Checking

procedures" [4 98] of the indoor unit power PCB and continue with the next procedure.

In document 1 General operation (сторінка 105-112)