E1(Indoor And Outdoor Unit Communica�On Error) (Only For 22K Models) - Roland FAVORITE ON-OFF Series Service Manual

5.3 E1 (Indoor and outdoor unit communica�on error)
Descrip�on: The indoor unit has not received feedback from the outdoor unit for 120 seconds.
Recommended parts to prepare:
• Indoor PCB
• Outdoor PCB
• Reactor
Troubleshoo�ng and repair:
Power off, then restart the unit a�er 2 minutes.
Measure Vs. (Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N)
alternately between Posi�ve and
The voltage moves alternately with
Check the outdoor wiring connec�on.
Does a problem remain?
YES
Is the voltage moving
nega�ve?
N O
posi�ve value.
Is it normal?
NO
Replace the outdoor PCB.
Power on.
Is the error
resolved?
NO
Replace the indoor PCB.
(only for 22k models)
NO The unit is opera�ng normally
The voltage is a
NO
certain value
Check the indoor wiring
connec�ons
Is it normal?
Replace the indoor PCB.
Power on.
Is the error resolved?
Replace the outdoor PCB.
YES
NO
Page 69