Daikin FT25JV1B Installation Manual download pdf (Page 22)

NOYESYES

YES

Is correct voltage supplied to bot

indoor and outdoor units?

Recheck the power supply.

Disconnect No.2 transmission wire (Note) fro

outdoor unit terminal board. Is outdoor unit dat

displayed with transmission monitor connected?

Faulty transmission wire.

Replace the transmissio

wire or remedy the fault

Replace the outdoor unit PC boar

(faulty data sending)

Is indoor unit data displayed with

connection of No.2 wire while

transmission monitor unchanged

connected?

Replace indoor unit PC board.

(Faulty data sending or receiving)

Is outdoor unit data displayed wit

transmission monitor connected to

indoor unit?

Malfunction 7-7: Error code “U4” (Transmission error between indoor and

outdoor units) is displayed.

Possible

causes

Ԙ No power supply to indoor or outdoor unit

ԙ Disconnection in transmission wire between indoor and outdoor units, short circuit,

poor insulation between phases, poor insulation unit and ground, incorrect wiring

Ԛ Faulty indoor unit PC board (Faulty data sending or receiving of indoor unit )

ԛ Faulty outdoor unit PC board (Faulty data sending or receiving of outdoor unit)

Outdoor unit sends the data independently.

If the data displayed, outdoor unit PC boar

sends the data normally.

If indoor unit data can

displayed, transmission wire is

OK.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 30 31

No comments

Daikin FT25JV1B Installation Manual Page 22