E1 (Indoor And Outdoor Unit Communication Error) - Kaisai FLY INVERTER Series Service Manual

5.3

E1 (Indoor and outdoor unit communication error)

Description: The indoor unit has not received feedback from the outdoor unit for 110 seconds, four consecutive times.
Recommended parts to prepare:
• Faulty indoor PCB
• Faulty outdoor PCB
• Faulty reactor
Troubleshooting and repair:
Power off, then restart the unit after 2 minutes.
Measure Vs. (Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N)
Check the outdoor wiring connection.
reactor
Does a problem remain?
YES
Is the voltage moving
negative?
The voltage moves alternately with
positive value.
Is it normal?
YES
Check the reactor.
Is it normal?
NO
Power on.
Is the error
NO
Replace the indoor PCB.
NO The unit is operating normally
The voltage is a
NO
certain value
Check the indoor wiring
connections
Is it normal?
YES
Power on.
Is the error resolved?
NO
Replace the outdoor PCB.
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