Hunter Fan R410A manual Error display e56, Insufficient refrigerant volume

15

Error display : e56

[Power transistor thermistor faulty.] (Only case of 151~251 type)

		Indoor unit			Outdoor unit
	Red LED		Stays OFF		Red LED		1 time flash
	Green LED		Keeps flashing
	Is the				Are the				Defective outdoor unit control
				YES	power transistor			YES
power transistor thermistor					thermistor characteristics				PCB	Replacement (Defective
connector connection					OK, is there no				power transistor thermistor input
	OK?				broken wire?				circuit)
		NO				NO				Temperature-resistance
										characteristics of power
										transistor thermistor (ThO-D)

Repair	Defective power transistor		°C]	100					10	°C]
	thermistor	Replacement
			80							80
			<			T< 80°C				>
			)[T						T> 80°C	)[T
● Display conditions			(kΩ							(kΩ
			resistance	50					5	resistance
If the temperature sensed by the thermistor is –10ºC or lower con-
tinuously for 5 seconds between 10 minutes and 10 minutes 20			Thermistor	0					0	Thermistor
seconds after the compressor goes ON, the compressor stops. Af-
ter a 3 minute delay, the compressor restarts. If this state is de-
tected 3 times in 40 minutes.				0	20	50	80	100	120
						Temperature [T] (°C)

16

Error display :	e57	[Insufficient refrigerant volume.]
Indoor unit				Outdoor unit
Red LED	Stays OFF		Red LED		1 time flash
Green LED	Keeps flashing		Green LED		Keeps flashing

Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.

Is the service valve

opened fully?

YES

Are the

connections of the connectors

to the indoor heat exchanger and return

air thermistor OK?

YES

Are the

characteristics of the indoor heat exchanger and return air thermistor OK?

YES

Is the low pressure during

operation normal?

NO

Fully opened.

NO

Normal

NO	Indoor heat exchanger and
	return air thermistor faulty
	Replace

NO

Charge with refrigerant.

Return air thermistor (ThI-A)

Indoor unit heat exchanger thermistor (ThI-R1, R2)

Resistance temperature characterisics

(kΩ)	15
	10
Resistance
	5	5kΩ at 25°	C

0 10 20 30 40 50 Temperature (°C)

YES

Indoor control PCB faulty Replace

(The indoor heat exchanger and return air thermistor input circuits are faulty.)

●Display conditions

If insufficient refrigerant protection (See page 92) is implemented 3 times within 30 minutes.

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