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P1 (High Pressure Protection) Diagnosis And Solution - Pioneer YN020GMFI22M2D Service Manual

Multi split system outdoor units/two, three, four and five zones
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8.4.2.9 P1 (High pressure protection) diagnosis and solution.

Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
P1
If the sampling voltage is not 5V, the LED will display the
failure.
● Wiring mistake
● Over load protector faulty
● System block
● Outdoor PCB faulty
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