4-Way Valve Reversing Failure - Haier AV08NMSETA Service Manual

[35] 4-way valve reversing failure

If connection between 4-way valve
and connecting board is good
If system meets condition
of 4-way valve reversing:
Measure if CN49 voltage
220VAC after 4-way valve
reversing condition is met
If there is air noise after 4-way
valve reverses, and if the temp. of
connection pipes with 4-way valve
Yes
Pd-Ps>0.6MPa
Yes
on connecting board is
Yes
If compressor running
current is normal
Yes
is normal
No
Replace 4-way valve
No
No
Check if SV1 leaks
No
Replace connecting board
No
Check compressor
63 63
Re-connect