Carrier 40GRQB12B-3 - Communication Malfunction (E6)

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7. Communication malfunction (E6)
Main detection points:
S Check if the wire is damaged or the polarity is mixed between terminals.
S Is the communication circuit of the indoor mainboard damaged?
S Is the communication circuit of the outdoor mainboard (AP1) damaged?
Malfunction diagnosis process:
E6
Did the unit operate normally
before malfunction?
Is the polarity correct
between all terminals?
If the wiring is
damaged?
Replace the
wire
Check the malfunction
type with communication
malfunction detector
Malfunction of outdoor
communication circuit
Replace outdoor
mainboard AP1
Replace indoor
mainboard AP2
Is the malfunction
eliminated?
Is the malfunction
eliminated?
End
Check the connection
wire according to the
wiring diagram.
Reconnect the wire or
replace the connection
wire according to the
wiring diagram.
Is the malfunction
eliminated?
If the connection wire
is connected well?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Fig. 36 – Troubleshooting