Sanyo AHX0952 Alarm meaning Compressor magnet SW seizing detected, Corresponding outdoor unit

Trouble Diagnosis

4. Blinking (Inspection) Display on the Remote Controller

Blinking inspection display (2) (compressor magnet SW seizing detection)

Alarm code	(Blinking	inspection display)
Alarm meaning	Compressor magnet SW seizing detected
	Status: The compressor and outdoor unit fan motor continue to run even though all indoor units
	within that refrigerant tubing system are stopped.
		Because the fan is running only at the outdoor unit where seizing was detected, check
		the corresponding outdoor unit.
		* The fan may also run on its own when fan cracking prevention control is in effect or
		when snowfall sensor input is present. Therefore monitor for approximately 10
		minutes if the outdoor unit fans are operating at multiple units.
Alarm conditions	Current is detected in the CT circuit when the compressor is stopped.
	(1) This control is not engaged for the first 30 seconds after the compressor turns ON →OFF.
	(2) For 1 minute following the first 30 seconds after the compressor turned ON →OFF, the
	threshold for the detected current is 10 A or more continuing for 2 seconds.
	(3) All times other than the above:
	If the low-pressure SW has not activated, the threshold for the detected current is 7 A or
	more continuing for 5 seconds.
	If the low-pressure switch has activated, the threshold for the detected current is 7 A or
	more continuing for 2 seconds.
Probable cause	(1) Magnet SW malfunction
	The magnet SW has seized, and the compressor is continuing to run.
	→ Even when the power is turned OFF, the primary side and secondary side contacts
	remain together.
	The conditions of magnet SW operation are poor (difficult to open).
	→ When a magnet SW is used in a DC circuit, it may be difficult for the SW to open at
	times. In an AC circuit the magnet SW should open instantaneously as long as the
	current is within the allowable range. However, this kind of trouble can occur if
	excessive current flows, and may prevent the SW from opening.
	(2) CT circuit failure or PCB failure (A/D failure)
	CT circuit contact failure
	→ Check that the connector is not partially disconnected.
	Wiggle the connector to check the connection.*
	* These symptoms will not occur if the connector is completely disconnected or the
		wire is cut. In these cases alarm Hx3 occurs.
	Current of 7A or higher was detected although the compressor was stopped, or a
	higher current was detected at occasional intervals.
	The compressor continues to operate at a time when the outdoor unit should be
	stopped (such as when all indoor units are stopped).
	→ Check whether or not 200 V is output from the PCB to the magnet SW. If the voltage
	is output, there is a PCB failure.
	(3) Installation error
	CT1 connector is connected to the compressor 2 side
	CT1 circuit is connected to the compressor 2 side
	CT2 connector is connected to the compressor 1 side
	CT2 circuit is connected to the compressor 1 side
Correction	(1) Replace the CT circuit.
	(2) Replace the magnet SW.
	(3) Replace the PCB.
	If the above probable causes are not the cause of the alarm, it is possible that in rare cases
	the alarm may be caused by the effects of noise. See notes.
Notes	–

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