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[35] 4-way valve reversing fail u re
if connection between
4-way valve and connecting
board is good
if Tsuc is fixed well and
if its characteristic is correct
if system meets condition
of 4-way valve reversing:
Pd-Ps>0.6MPa
measure if CN49
voltage on connecting board is
220VAC after 4-way valve
reversing condition is met
if compressor running current
is normal
if there is air noise after
4-way valve reverses, and if the
temp. of connection pipes with
4- way valve is normal
replace 4-way valve
no
yes
no
yes
no
yes
no
yes
no
yes
no
156
re-connect
fix again or replace the sensor
check if SV1 leaks
replace connecting board
check compressor
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