Sanyo CHDXR09663, CHDXR07263, CHDX09663, CHDX07263 F17 Alarm Alarm code, F31 Alarm Alarm code

4. W-2WAY ECO-i Alarm Codes

W-2WAY ECO-i SYSTEM Trouble Diagnosis

		Correction	(1)	Replace the high-pressure sensor.
				Caution: Because the high-pressure sensor connection employs a Schrader-type valve, it can
				be removed and replaced. However, the high-pressure sensor can be easily
				damaged by high voltage; therefore use sufficient caution with regard to static
				electricity.
			(2)	Replace the PCB.
			(3)	Correct the locations of problems in the refrigeration cycle.
				• Correct locations where clogging or leakage has occurred.
				• In the case of over-charging, recover refrigerant. (Adjust the amount of refrigerant).
				∗ Guide for over-charging
				Be sure to connect the gauge to the high-pressure outlet when checking for over-charging.
				During cooling: The following does not apply when outdoor air temperature is low or when fan
				speed is controlled. When both compressor 1 and compressor 2 are
				operating, and the fan mode is 14 (maximum fan speed), then the high
				pressure saturation temperature should be approximately 30°F above the
				outdoor air temperature. If it is 10°F or more above this level, then it is
				possible that over-charging may have occurred.
				During heating: There is an indoor unit where refrigerant flow is poor (E1 temperature and
				discharge temperature are low), and the mechanical valve of that unit is
				opened to 300 pulses or more, and the E1 temperature is close to room
				temperature. However be aware that this kind of data results often when
				there is a height difference between indoor units. Reducing the amount of
				refrigerant will improve the refrigerant flow, however reducing it too much will
				increase the likelihood of alarms related to low oil level (scroll-side), the low
				pressure SW, and discharge temperature. Use caution.
		Example	This alarm may result when the service valve is closed or when valve leakage (particularly from
			the mechanical valve) occurs.
	F17 Alarm
		Alarm code	F17
		Alarm meaning	Low-pressure sensor trouble
		Alarm conditions	(1)	Sensor short circuit
			(2)	Sensor open circuit
		Probable cause	(1)	Sensor malfunction (including connector)
			(2)	PCB malfunction
		Check	(1)	Measure the sensor resistance. Check that the sensor is operating normally.
5			(2)	Use a remote monitor or a PC monitor to check the temperature that is recognized
				by the microcomputer.
		Correction	—
		Example	—
		Notes	—
	F31 Alarm
		Alarm code	F31
		Alarm meaning	Outdoor unit non-volatile memory (EEPROM) trouble
		Alarm conditions	(1)	Non-volatile memory is not present when power initialization occurs.
			(2)	Read values do not match after writing to non-volatile memory is complete.
		Probable cause	(1)	Memory was not inserted after the PCB was replaced.
			(2) The lifetime of the non-volatile memory has been reached.
			(3)	Non-volatile memory is installed incorrectly (wrong direction, bent pins, etc.).
		Check	(1)	Check the non-volatile memory on the PCB.
		Correction	—
		Example	—
		Notes	—

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