Notes:
1. High pressure switch connection is port CN18 on the main PCB.
2. High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to
be lower than normal.
3. Outlet water temperature sensor (TW-out) connection is port CN10 on the hydro system PCB.
4. Measure the resistance among the terminals of the pressure switch. If the resistance is of the order of mega Ohms or infinite, the pressure switch has failed.
Protection logic
Note:
Pc: Discharge pressure
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