Scotsman Prodigy Series - Manual (Page 49)

January 2015 Page 49
Diagnostics – Remote Air 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
Dirty condenser Clean condenser
Restricted location, intake air too hot Have condenser moved
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 Check fan motor pressure control, check
fan motor, check controller using test
mode
Fan motor not turning Check fan motor, check fan blade
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
Liquid line valve does not open Check coil of valve, check controller
using test mode
Compressor inefficient Check compressor amp draw, if low and
all else is correct, change compressor
Debris in refrigeration system Recover charge. Open quick connects,
check for loose or missing foil. Open
liquid line and hot gas valves. Check for
debris. Replace drier, evacuate and
weigh in nameplate charge.