Gree FG20/BNa-M, Service Manual

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Duct Type Split Air Conditioner
Service Manual
2.5 Communication Malfunction
Communication malfunction
Check if co mmunica tion line of
indoor unit is properly connected
Measure if communication line is
closed circuit
Check if communication between
indoor unit a nd outdoor unit is
properly connected
Check if the two ends of
communication line are cover ed
with magnetic rings
Malfunction is eliminated
Confirm locatio ns of plug
and faucet
Replace communication line
Confirm locatio ns of plug
and faucet
Please wind the magnetic
rings with the unit
Yes
Yes
Yes
Yes
Yes
No
No
No
No
2.6 Temperature sensor malfunction
F2 condenser temperature sensor malfunction
F3 outdoor temperature sensor malfunction
F4 discharge temperature sensor malfunction
Temp
.
sensor malfunction
If pl ug of temp. sensor and socket on
mainboard are connected properly?
Remove the temp. sensor and then measure
if its resistance value is in normal range
Replace indoor mainboard
Confirm locations of socket and plug
Replace temp. sensor
Yes
Yes
Yes
No
No