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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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Sanyo XHX1252, UHX2452, UHX0752, UHX1252, UHX3652, UHX1852, THX2452, THX1252, THX1852, XHX1852 H11, H12, H21, H22 Alarm Alarm code