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Trouble Diagnosis
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P22 Alarm
Alarm code P22
Alarm meaning Fan motor trouble
Alarm conditions Fan motor start failure, fan motor Hall IC input failure
Probable cause Possible causes are a Hall IC input circuit failure and a fan HIC failure.
Check Check the fan motor wiring, the Hall IC wiring, and the connector connections. If the wiring and
connectors are normal, then check that the capacitor of the Hall IC input circuit is securely
soldered onto the PCB. Also use a tester and measure the resistance between fan HIC power
(HIC+) and ground (HIC–). If there is a short circuit, there is an HIC malfunction.
Correction If the fan does not start, the below corrections may be effective.
(1) If there is a fan HIC failure or circuit failure, replace the PCB.
(2) If the fan motor is locked, replace the fan motor.
Example
Notes Turn OFF the power, and check the continuity of “+” and “–” on the fan circuit PCB.
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3. W-2WAY ECO-i Alarm Codes
(-) (+)
P26 Alarm
Alarm code P26
Alarm meaning Inverter compressor high-frequency overcurrent alarm
Alarm conditions This alarm occurs when current trouble or current detection trouble occurs at an inverter frequency
of 80 Hz or higher after start (when trouble judgment current is detected 13.5 A higher in the
primary or secondary current).
Probable cause The detection methods are the same as for P16. However the fact that operation up to high
frequencies is possible does not necessarily mean that a compressor failure is the cause of the
trouble. Start the compressor several times. If alarm P26 occurs every time and alarm P16 does
not occur at all, then the possibility of a compressor failure is low. It is also possible that the
cause may be the effects of noise.
Check Check the power wiring and connector wiring.
Correction It is possible to resolve this trouble by limiting the maximum frequency.
Example
Notes
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P29 Alarm
Alarm code P29
Alarm meaning Inverter compressor missing phase or lock alarm
Alarm conditions This alarm may occur at start, and occurs when missing phase or lock is detected, and when a
DCC T failure occurs .
Probable cause Generally this alarm occurs when the refrigerant pressure balance is uneven at start, or when
inverter compressor lock occurs, there is a missing phase in the inverter compressor wiring, or a
DCC T failure occurs. This can be judged to be starting trouble which is not caused by HIC .
Check Check the power wiring and connector wiring.
Correction DCC T failure (replace PCB) or compressor failure
Example
Notes Use a tester to measure the voltage between the DCCT output terminal on the rear of the PCB
and the ground. If the voltage is not within 2 – 3 V , then the DCC T has malfunctioned .
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