Scotsman Prodigy Series - Manual (Page 46)

January 2015 Page 46
Diagnostics – Water Cooled
No ice
Problem Likely Cause Probable Solution
No power to unit Power disconnected Check breaker or fuse.
Reset or replace, restart and check
No power to controller Transformer open Replace transformer
Shut down on maximum
water fill time
Water shut off Restore water supply
Shut down on maximum
freeze time
Water leak Check purge valve, curtain, sump, pump
hose
Ice thickness sensor dirty or disconnected Check ice thickness sensor probe
Water distributor dirty Remove and clean water distributor
Inlet water valve leaks through during freeze Check inlet water valve
Connected to hot water Check for bleed thru from / missing check
valve in building water supply
Incomplete harvest Check harvest system
High pressure cut out opened Water supply cut off, restore water supply
to condenser
Fan motor pressure control open Check fan pressure control
Fan motor not turning Check fan motor, check fan blade, check
controller using test mode
Water pump not pumping Check pump motor, check controller
using test mode
Pump hose disconnected Check hose
Compressor not operating Check compressor contactor, check
controller using test mode
Check compressor start
components, check PTCR
resistance and temperature
Check compressor voltage
Check compressor windings
Low refrigerant charge Add some refrigerant and restart unit. If
cycle time improves, look for leak.
Hot gas valve leaks through during freeze Check hot gas valve for hot
outlet during freeze
Thermostatic expansion valve bulb loose Check bulb
Thermostatic expansion valve producing very
low or very high superheat
Check evaporator superheat, change
TXV if incorrect
Compressor inefficient Check compressor amp draw, if low and
all else is correct, change compressor