Daikin FT25JV1B Installation Manual download pdf (Page 13)

7. Problem diagnosis

Since the respective model has its own characteristics, all problem diagnosis cannot be described in details.

This chapter describes typical diagnosis (in which the Transmission Monitor is used effectively) for

individual cases. In the chart, the inspection item which is not possible or difficult without Transmission

Monitor is indicated in color .

Especially, to diagnose for maintenance relating transmission such as ON/OFF operation of LED and “Error

U4”, connection wire inspection is required in the first stage, which does not make sense if no malfunction

is found out. Transmission Monitor enables to distinguish malfunction in internal/external PCB and

communication wire and diagnosis is carried out synchronously with the function. Since an incorrect

diagnosis may be occurred when using only LED data, it is required to carry out diagnosis confirming the

judgement by using the data of the Transmission Monitor.

Possible cause is described in the order of frequent occurrence.

Reference sheet: Procedure for Indoor unit and outdoor unit diagnosis by LED

Diagnosis by LED

7-1:Indoor Unit LED-A On

7-2: Indoor Unit LED-A Off

7-3: Indoor Unit LED-B On

7-4: Indoor Unit LED-B Off

7-5:Outdoor Unit LED-A On

7-6:Outdoor Unit LED-A Off

Malfunction code diagnosis

7-7: Malfunction code “U4” is displayed.

7-8: Malfunction Code “A5” (Overload/Freeze-up Protection) is displayed

7-9: Malfunction code “C4”,”C9”,”J6”,”H9” (Malfunction of thermistors) is displayed.

7-10: Malufunction code “U0” is displayed.

Other diagnosis

7-11: Cannot Cool/Cannot Heat (Too Cool/Too Hot)

7-12: Problem Diagnosis for Skyair Twin/Triple/Double twin multi-unit using a R22 refrigerant

7-13: Water leakage occurs under a certain condition.

7-14: Noise occurs from compressor (main unit).

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Daikin FT25JV1B Installation Manual Page 13