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Emphasizes EPA regulations for refrigerant handling and servicing by trained personnel due to electric shock risk.
Warns of high voltage and extreme caution, advising against attempting service without qualification.
LP indicates the low pressure switch is open, usually due to refrigerant pressure dropping below 80PSI.
Common causes include refrigerant leaks, bad fan motor/capacitor, or a faulty LP switch.
HI or HP indicates the high pressure switch is open, often due to restricted water flow or TXV failure.
Primary cause is restricted water flow; also covers TXV failure and refrigerant overcharge.
PO or OP indicates an open water temperature sensor.
Check sensor wiring and resistance; replace sensor or control board if necessary.
Pc or SH indicates a shorted water temperature sensor.
Check sensor wiring and resistance; replace sensor or control board if necessary.
dPO or cOP indicates an open defrost temperature sensor.
Check sensor wiring and resistance; replace sensor or control board.
Pc or SH indicates a shorted defrost temperature sensor.
Check sensor wiring and resistance; replace sensor or control board.
Flo or PS indicates an open water pressure switch, usually related to water flow.
Check filter, pump, and bypass; test pressure switch continuity and adjust/replace if needed.
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