Gree GWH18AC-D3DNA1B - Page 56

Troubleshooting
9.2.3.8 Communication malfunction (outdoor unit malfunction)
Indoor display: E6 (dual-8 display), heating indicator is off for 3S and blinks 6 times.
Main detection point:
z Check if the connection wire and the built-in wiring of indoor and outdoor units are connected well and not damaged;
z Is the communication circuit of indoor mainboard damaged? Is the communication circuit of outdoor mainboard
(AP1) damaged?
Malfunction diagnosis process:
Start
Check communication
circuit of outdoor unit
Problem of
communication circuit
Check if controller connection wire
of indoor and outdoor electric box is
loosened
Connection
correct?
Check connection wire of
indoor and outdoor unit
with circuit diagram
Check connection wire of
indoor and outdoor unit
with circuit diagram
If the unit is operation normal
before malfunction
Y
N
Y
N
If the connection wire of
electric box is normal.
If the malfunction is
removed?
N
Y
Replace indoor
mainboard
Replace outdoor
mainboard(AP1)
If the malfunction
is removed?
Finish
N
Y
Y
Y
Check connection
wire of indoor and
outdoor unit with
circuit diagram
N
If the
malfunction is
removed?
Y
N
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