Manitowoc QF0400 Technician's Handbook page 186

6. Set ICE/OFF/CLEAN switch to ICE.
7. No water or air flowing through the condenser will
cause the HPCO control to open because of
excessive pressure. Watch the pressure gauge
and record the cut-out pressure.
If discharge pressure exceeds 460 psig (3172 kPa
31.72 bar) and the HPCO control does not cut out,
set ICE/OFF/CLEAN switch to OFF to stop ice
machine operation.
Replace the HPCO control if it:
8. Will not reset [below 300 psig (2068 kPa 20.68
bar).
9. Does not open at the specified cut-out point.
186
Warning
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Part Number 80-1230-9 10/10