Daikin FT25JV1B Installation Manual download pdf (Page 26)

YES

Is value of each temperature thermisto

close to measured value?

Replace the thermistor. (If the

malfunction is not remedied even

when the thermistor is replaced,

replace the PC board.)

YES

Does refrigerant leak?

Repair the leaking point and

charge the specified amount of

refrigerant

Change the set temperature. Do pressure,

pipe temperature, andǍT㧔㧖㧕vary properl

in accordance with the change of the

compressor operating frequency?

Check refrigerant circuit once again.

Does the faulty

compression occur?

(Conduct pump down

operation to check.)

Is refrigerant circuit clogged?

YES

Repair the clogged point of

refrigerant circuit.

Replace the

compressor

Malfunction 7-10: Error code “U0” (Refrigerant shortage) is displayed.

Possible

causes

Ԙ Refrigerant shortage

ԙ Clogged refrigerant circuit

Ԛ Faulty thermistor

ԛ Faulty compressor (inverter type only)

Ԝ Faulty PC board

㧖“U0” is decided when the compressor operating frequency exceeds a certain frequency (that varies depending

on the model) while low current continues or when there is no difference in temperature between indoor and

outdoor heat exchangers. Measure the compressor operating frequency and temperature of each section with

the transmission monitor, and actual value of current, temperature at the thermistor section, gas pressure, etc.

to compare the values and probe the causes.

㧔㧖㧕 Difference between the suction and discharge temperatures of indoor unit

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Daikin FT25JV1B Installation Manual Page 26