10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
245
10
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Decrease of discharge
gas superheat
Refrigerant cycle is different from the
electrical system
Check refrigerant cycle and the
electrical system
Repair wiring
Overcharged refrigerant Measure pressure Correctly charge refrigerant
Faulty Expansion Valve
Check expansion valve. Refer to
“8.3 Electronic expansion valve”
Replace expansion valve if
faulty.
Faulty PCB
Fault
Replace PCB and check
operation
Replace PCB if faulty
Disconnected wires
for expansion valve
control
Check connections Repair wiring connections
Faulty
discharge gas
thermistor
Fault Measure resistance Replace thermistor if faulty
Incorrect mounting
Check mounting state See Alarm
Code 08 in section “10.2.1.1
Alarm codes for the outdoor
units”
Correctly mount thermistor
Incorrect connection Check connections
Remove looseness,
replace connector or repair
connections.
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