Sanyo XHX1252, UHX2452, UHX0752, UHX1252, UHX3652, UHX1852 H11, H12, H21, H22 Alarm Alarm code

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Trouble Diagnosis

3. W-2WAY ECO-i Alarm Codes

H11, H12, H21, H22 Alarm

Alarm code	H11, H12, H21, H22
Alarm meaning	H11: Compressor 2 (constant speed) overcurrent alarm
	H12: Compressor 2 (constant speed) lock current alarm
	H21: Compressor 3 (constant speed) overcurrent alarm
	H22: Compressor 3 (constant speed) lock current alarm
Alarm conditions	H11, H21: During operation, the compressor current value exceeded 12 A for 30 seconds or longer.
		However this alarm is not detected for 4 seconds after the compressor starts.
	H12, H22: During operation, the compressor current value exceeded 15 A for 2 seconds or longer.
		However this alarm is not detected for 4 seconds after the compressor starts.
Probable cause	(1) Compressor failure (locked or partially locked)
	(2)	CT (Current Transformer) circuit failure (including cut wiring)
	(3)	Low power voltage
	(4)	PCB failure
Check	(1) Compressor failure (partially locked)
		Trouble: Current value during operation greatly exceeds the value shown above.
		Check: When the current for each phase is measured with a clamp meter or similar
		instrument, check that the current value for all phases is not high. If MG was forced
		ON (use caution), check that compressor noise will not occur or the compressor will
		not run with a groaning sound.
	(2)	CT circuit failure, PCB failure
		Trouble:
		Check: · Check for poor connector contact.
		· Check the continuity of the CT circuit.
		· Install a normal CT in place of this CT and check. If current is detected, then the
		PCB can be judged OK.
		CT circuit failure
		· Check that current is flowing in the phase where the CT circuit is connected.
		Check voltage and current.
	(3)	Low power voltage
		Trouble: In most cases, this occurs when another constant-speed compressor (including
		compressors in other units) or other device starts. It also occurs when the power
		wiring is extremely long.
		Check: Check the voltage between each of the phases. However if this trouble occurs when
		other devices or compressors start, then an oscilloscope is required.
	(4)	PCB failure
		Trouble:
		Check: Check that the current value measured with the clamp meter is not lower than the
		value measured with the PC or remote controller.
Correction	(1) Replace the compressor.
	(2)	Replace the CT circuit.
	(3)	Adjust the primary-side power. Repair the power wiring.
	(4)	Replace the outdoor unit PCB.
	(5)	Correct the trouble.
		* In the case of a compressor failure, it is likely that steps must be taken to correct the cause
		of the compressor failure (such as liquid back-up) in order to prevent recurrence. Be sure to
		check that there is no cause which may result in compressor locking.
Example	—

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