Sanyo 2-WAY ECO-i SPW-C0705DXHN8 Service Manual page 129

4. W-2WAY ECO-i Alarm Codes
H11, H12, H21, H22 Alarm
Alarm code H11, H12, H21, H22
Alarm meaning H11: Constant speed compressor 2 overcurrent alarm
H12: Constant speed compressor 2 lock current alarm
H21: Constant speed compressor 3 overcurrent alarm
H22: Constant speed compressor 3 lock current alarm
Alarm conditions Hx1: 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.
Hx2: During operation, the compressor current value exceeded 14 A for 4 seconds or longer.
However this alarm is not detected for 2 seconds after the compressor starts.
Probable cause (1) Compressor failure (locked or partially locked)
(2) CT circuit failure (including cut wiring)
(3) Missing power phase
(4) Low power voltage
(5) 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
(2) CT circuit failure, PCB failure
Trouble:
Check: • Check for poor connector contact.
(3) Missing power phase
Trouble: This alarm primarily occurs when the T-phase is missing. When the R-phase or
Check: There is the possiblility of a magnet SW failure. Therefore, check the phase voltage at
(4) Low power voltage
Trouble: In most cases, this occurs when another constant-speed compressor (including
Check: Check the voltage between each of the phases. However if this troube occors when
(5) PCB failure
Trouble:
Check: Check that the current value measured with the clamp meter is not lower than the
(6) If the cause is still unknown after checking the above, then it is possible that noise is the
cause of the trouble. It is necessary to connect a PC or other instrument.
Correction (1) Replace the compressor.
(2) Replace the CT circuit.
(3) Repair the power circuit.
(4) Adjust the primary-side power. Repair the power wiring.
(5) Replace the outdoor unit PCB.
(6) 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 resuit in compressor locking.
Example —
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.
• 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 jedged OK.
→CT circuit failure
• Check that current is fl owing in the phase where the CT circuit is connected.
→Check voltage and current.
S-phase is missing, CT trouble or PCB continuity trouble occur. However this may not
be true in the case of a missing phase caused by magnet SW trouble.
a location that is as close to the compressor as possible.
compressors in other units) or other dvice starts. It also occurs when the power
wiring is extremely long.
other devices or compressors start, then an oscilloscope is required.
value measured with the PC or remote controller.
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W-2WAY ECO-i SYSTEM
Trouble Diagnosis
5