Sanyo TH2672R / C2672R, XH4272R / C4272R, UH2672R, XH2672R, XH3672R Alarm P26, HIC PCB trouble

4. Service procedures

(2) [Alarm “P26”]	IGBT short-circuit protection on inverter control (IPDU) PCB
HIC PCB trouble)

Is power OK?	No		Correct power line.
Yes
Are
circuit wiring,
connector	No		Correct.
connections, and
reactor
connections
OK?
Yes
Has filter PCB	No
RY001 or RY002
relay activated?
Yes	Has filter PCB	Yes	Replace filter PCB.
	AC fuse blown?
Disconnect	No
U.V.W. output	No
terminal on HIC PCB and			Replace HIC PCB.
start operation.
Does alarm
“P26”
occur?
Yes

Is

compressor OK? No (Check for layer

short circuit.)

Yes

Is

resistance between

each terminal on No

HIC PCB OK? (See following page.)

Yes

Replace outdoor unit control PCB.

Check HIC PCB. Replace if PCB has failed.

Replace compressor.

SM831148

IV-9