Page 22
Page 22
DIAGNOSIS
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 shut off Restore water supply
water fill time
Shut down on maximum Water leak Check purge valve, curtain,
freeze time sump, pump hose
Air filters clogged Clean air filters
Dirty condenser Clean condenser
Restricted location, intake air too hot
Have machine moved
Ice thickness sensor dirty or Check ice thickness sensor probe
disconnected
Water distributor dirty Remove and clean water distributor
Inlet water valve leaks through Check inlet water valve
during freeze
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 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
Shut down on maximum Pump hose disconnected Check hose
freeze time
Check compressor contactor,
check controller using test mode
Compressor not operating Check compressor start components
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 Check hot gas valve for hot
freeze outlet during freeze
Thermostatic expansion valve Check bulb
bulb loose
Thermostatic expansion valve Check evaporator superheat,
producing very low or very high change TXV if incorrect
superheat
Compressor inefficient
Check compressor amp draw, if low and
all else is correct, change compressor
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