Daikin FT25JV1B Installation Manual download pdf (Page 24)

YES

Is the unit operating beyond the

specified range?

Explain the specified range for

continuous operation to improve the

operating conditions.

Is value of each temperature thermisto

close to measured value?

Replace the thermistor. (If the

malfunction is not remedied eve

when the thermistor is replaced,

replace the PC board.)

Does value of each temperature thermisto

remain within normal operating range?

Locate the causes based on the

abnormal value.

Example:

࡮ Insufficient or excessive

refrigerant amount

࡮ Dirty air filter

࡮ Dirty heat exchanger

࡮ Clogged refrigerant circuit, etc.

Probe causes other than main unit including insufficien

or excessive capacity, short circuit, etc.

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

displayed

Possible

causes

Ԙ Dirty indoor unit filter or heat exchanger

ԙ Faulty thermistor

Ԛ Insufficient or excessive refrigerant amount

ԛ Clogged refrigerant circuit

Ԝ Local causes (cooling in low outside air temperature, heating in high temperature,

short circuit, etc.)

ԝ Faulty PC board

㧖Since information may not enough with the transmission monitor to verify on some models, refer to the

operating pressure, operating current, etc. as well for diagnosis.

(Reference)

The error code “A5” (Overload/Freeze-up Protection) is detected by the indoor unit heat exchange

thermistor and outdoor unit heat exchange thermistor. Check for the reading of microcomputer with the

transmission monitor while measuring the temperature through the heat exchanger thermistors. If both

temperatures are coincided, probe real causes to actuate the overload control.

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Daikin FT25JV1B Installation Manual Page 24