Mitsubishi Electronics PCH42GK Trouble Shooting, OC277-43, Remote Controller Display Abnormality

10	TROUBLE SHOOTING
1. REMOTE CONTROLLER DISPLAY ABNORMALITY
Display abnormality			Cause			Check points
The display “centrally con-		1)	Wrong address setting of remote con-	1) Check the address setting of remote controller
trolled” on remote con-			troller/indoor controller board.	and indoor controller.
troller does not disappear.		2) Timer adapter is connected to the		2) Check if the timer adapter is used correctly.
			remote controller.	3) 1 Turn another remote controller’s DIP SW17-
		3)	Signal transmission error between		7 ON to make it sub controller.
			indoor unit and remote controller.	2 Connect the sub controller to the unit, and
					turn circuit breaker ON.
				● If the display “centrally controlled” disap-
					pears, replace the original remote controller.
				● If the display remains the same, replace the
					indoor controller board.
When remote controller		1)	Signal transmission error between	1) 1 Connect a sub remote controller.
POWER switch is turned			indoor unit and remote controller	2 Turn circuit breaker ON.
to ON, the check code					If the display “centrally controlled” remains,
“E0”appears.					replace the indoor controller board.
				3 If the display disappears, turn the remote
					controller POWER switch ON and check as
					follows.
						Remote controller	Sub remote controller	Malfunction
					1	Operating Display	E0 Display	Malfunction of
								Indoor Unit
					2	Operating Display	Operating Display	Malfunction of
								Remote controller
					3	No Display	E0 Display	Malfunction of
								Indoor Unit and
								Remote Controller
					4	No Display	Operating Display	Malfunction of
								Remote controller
When remote controller		1)	Short circuit of indoor/outdoor connect-	1), 2) Check the wire
POWER switch is turned			ing wire	3) Measure the resistance of the drain sensor
to ON, operating display		2)	Short circuit of transmission wire.	connector CN50 1 - 3. If normal, the value
appears, but disappears		3)	Short circuit of drain sensor heater cir-	should be 82Ω .
soon.			cuit.	4) Turn the circuit breaker OFF, and then turn
		4)	Wrong operation of remote controller	ON.
			due to noise wave emitted by other	If the remote controller remains abnormal,
			appliances.	despite the above measures, replace the indoor
				controller board.
Despite turning POWER		1)	Damaged remote controller.	1) Measure the voltage between terminals of
switch ON, the remote		2)	Short circuit of transmission wire.	remote controller. If no voltage, remove the
controller display does not		3)	Bad contact of indoor CN40.	terminals and measure the voltage between
appear.		4) CN40 is attached to a sub unit.		wires. If the voltage is between 6VDC and
		5)	Damaged transformer.	12V, replace the remote controller.
		6)	Bad contact of CN2D.	2) ~ 8) Check each point.
		7)	Broken fuse.			If normal, replace the indoor controller
		8)	Circuit breaker OFF.			board.

OC277-43