Sanyo KHX1852, UHX2452, UHX0752 P22 Alarm Alarm code, P26 Alarm Alarm code, P29 Alarm Alarm code

Trouble Diagnosis

3. W-2WAY ECO-i Alarm Codes

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.
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	—
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
	DCCT 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
	DCCT 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	DCCT 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 DCCT has malfunctioned.
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