Troubleshooting by Remote Controller Si20-701_B
145
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>
îš„ Defective high pressure switch
 High pressure switch’s harness is broken or
disconnected
 Defective high pressure switch’s connector connection
îš„ Defective outdoor unit PCB
<Causes related to product as a whole>
îš„ Indoor unit air filter is clogged
îš„ Outdoor unit heat exchanger dirty
îš„ Defective outdoor unit fan
îš„ Refrigerant overcharged
îš„ Stop valve is not opened
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