Sanyo XH4272R / C4272R, UH2672R, XH2672R, XH3672R Alarm E31, Communications Trouble within unit

	4. Service procedures
HIC-CH4872R	HIC-CH2672R
(42 Type)	(26, 30, 36 Type)

4

			Resistance
		Between terminals		Resistance
		HIC +	HIC –	200 kΩ or more
		HIC +	U	300 kΩ or more
		HIC +	V	300 kΩ or more
		HIC +	W	300 kΩ or more
		HIC –	U	200 kΩ or more
		HIC –	V	200 kΩ or more
(3) [Alarm “E31”]		HIC –	W	200 kΩ or more
		IGBT short-circuit protection
(communications
trouble within unit)
		Is “E31”	No
	displayed even after				Normal
	the power voltage

is reset?

Yes

Replace outdoor unit control PCB.

SM831148

IV-10