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After one week running, now the display shows HP1 and the heat pump can not work, how can we solve it?

Please check the high pressure switch itself and the system pressure at first because HP1 means the system pressure is too high;
If necessary, please replace this high pressure switch with a new one;
 
 
When the inlet water temperature is too high ( over 45 degrees), the system pressure will alarm because of high pressure, especially in Summer or Autumn when the ambient temperature is not low( over 15 degrees);
2018-CHICAGO-AHR
2018-ACREX-INDIA
2018-MCE-ITALY
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