266
yes
if connection between
4-way valve and connecting
board is good
[35] 4-way valve reversing failure
no
no
no
yes
yes
no
re-connect
fix again or replace the sensor
replace connecting board
replace 4-way valve
yes
no
yes
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 Tsuc is fixed well and
if its characteristic is correct
check if SV1 leaks
check compressor
if there is air noise after
4-way valve reverses, and if the
temp. of connection pipes with
4- way valve is normal
no
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