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[P19 error]
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
∗ Refer to temperature-Resistance value
characteristic table.
Is operation of 4-way valve normal?
Is refrigerant flow by PMV normal?
Is circuit wiring normal?
Are resistance value characteristics
of TC sensor normal?
In heating mode,
4-way valve coil terminal 200V
Check 4-way valve.
Defective → Replace
Check and replace PMV.
Replace TC sensor.
Check CDB P.C. board.
Defective → Replace
Check and correct circuit.
Check indoor P.C. board (MCC-1403).
Defective → Replace
Check CDB P.C. board.
• In cooling operation, the outdoor unit [P19 error] may be displayed when high pressure is abnormally up.
In this case, referring to item [P04 error], eliminate the pressure-up cause and then diagnose the error again.