Communication Malfunction; Temperature Sensor Malfunction - Gree FGR20/BNa-M Service Manual

2.5 Communication Malfunction

Communication malfunction
Yes
Check if co mmunica tion line of
indoor unit is properly connected
Yes
Measure if communication line is
closed circuit
Yes
Check if communication between
indoor unit a nd outdoor unit is
properly connected
Yes
Check if the two ends of
communication line are cover ed
with magnetic rings
Yes
Malfunction is eliminated

2.6 Temperature sensor malfunction

F2 condenser temperature sensor malfunction
F3 outdoor temperature sensor malfunction
F4 discharge temperature sensor malfunction
Temp. sensor malfunction
Yes
If pl ug of temp. sensor and socket on
mainboard are connected properly?
Yes
Remove the temp. sensor and then measure
if its resistance value is in normal range
Yes
Replace indoor mainboard
No
Confirm locatio ns of plug
and faucet
No
Replace communication line
No
Confirm locatio ns of plug
and faucet
No
Please wind the magnetic
rings with the unit
No
Confirm locations of socket and plug
No
Replace temp. sensor
Duct Type Split Air Conditioner
Service Manual
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