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Error code check
(Note 1) Measure resistance to see
if 4way valve is normal
4way valve connector location in main PCB
(It is marked as CN16_VI, CN25_BK)
(Note 2) Check if the coil is fully inserted in 4way valve.
*Normal value: several kΩ
(Note 3) During the heating operation, check if 220V is output from PCB