Hpco Check Procedure - Manitowoc I0320 Technician's Handbook

CHECK PROCEDURE
Symptom #1 Machine is off and the display
indicates "Delay xx min, HPCO Active".
1. Leave all wiring connectors attached and perform
testing within the 60 minute time delay period
2. Check for line voltage at P9 connector on control
board (Two wire connector adjacent to 9 pin
connector).
A. Line voltage present - HPCO switch has reset
and closed.
B. No line voltage present - HPCO switch is
open.
3. Depending on timing either wait for the delay
period to end or start a new freeze cycle. The ice
machine will go to an initial start sequence. When
the compressor relay closes the control board
checks the HPCO
A. HPCO is open - Another 60 minute delay
period starts.
B. HPCO closed - A 3.5 minute harvest cycle
starts followed by an ice making cycle.
4. Run the system to see if the control trips. If HPCO
opens, find the root cause - Fan motor, dirty
condenser, refrigeration system issue, etc.
152 Part Number STH038 5/12