Service
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219
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‘19 • HM-T-340
E54 - S. fault LPT (for FDCW71, 100, 140VNX)
YES
NO
Connect it.
NO
YES
NO
YES
OK.
Is the low pressure sensor
correctly connected?
Does the pressure (external meter)
correspond with the value
displayed in the indoor unit?
Check the amount of refrigerant.
Check the refrigerant circuit.
Replace the low pressure
sensor.
Has the fault been corrected?
Replace the control PCB.
Troubleshooting guide