Sanyo AHX0752 - Manual (Page 76)

3-14
Trouble Diagnosis
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3. W-2WAY ECO-i Alarm Codes
H11, H12, H21, H22 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example —
(1) Compressor failure (locked or partially locked)
(1) Compressor failure (partially locked)
(2) CT (Current Transformer) circuit failure (including cut wiring)
(3) Low power voltage
(4) PCB failure
(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.
H11: Compressor 2 (constant speed) overcurrent alarm
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.
H12: Compressor 2 (constant speed) lock current alarm
H22: Compressor 3 (constant speed) lock current alarm
H21: Compressor 3 (constant speed) overcurrent alarm
H11, H12, H21, H22
Trouble:
Check: Current value during operation greatly exceeds the value shown above.
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.
(3) Low power voltage
Trouble:
Check:
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 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.
(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.