Daikin R71FUV1 Service Manual page 152

Troubleshooting by Remote Controller
Remote Controller Display
E3
Applicable Models
R(Y)-LU, RR-M
Method of Error Detection
Continuity of the high pressure switch is detected by the
safety device circuitry.
Error Decision Conditions
Case where high pressure switch is actuated when the
compressor is operating
Supposed Causes
<Causes related to PCB>
Defective high pressure switch
High pressure switch's harness is broken or
disconnected
Defective high pressure switch's connector connection
Defective outdoor unit PCB
<Causes related to product as a whole>
Indoor unit air filter is clogged
Outdoor unit heat exchanger dirty
Defective outdoor unit fan
Refrigerant overcharged
Stop valve is not opened
Si20-701_B
145