Scotsman MVP606 - Page 23

Page 23
Page 23
Problem Likely Cause Probable Solution
Shut down on maximum Ice bridge thickness too small, Check and adjust if needed
harvest time not enough ice to open curtain
Ice bridge thickness too large, Check and adjust if needed
ice frozen to evaporator frame
Purge valve does not open, water Check purge valve
melts ice bridge, not enough ice to
open curtain
Incomplete ice formation Check water distributor for partially
plugged holes
Curtain out of position Check curtain for swing restriction
Curtain switch does not open when Check switch with ohmmeter
curtain does
Machine in very cold ambient Move machine to a warmer location
Hot gas valve does not open Check hot gas valve, check controller
using test mode
Harvest assist probe out of position - Check harvest assist mechanism -
ejector pin not retracted spring should retract pin
Damaged evaporator Check evaporator surface
Fan motor stays on during harvest Check controller using test mode
Shut down on minimum Grounded ice thickness sensor Check sensor for dirt and position.
freeze time Clean and check gap to evaporator surface.
Long freeze cycle Dirty air filters Clean filters
Dirty condenser Clean condenser
Hot ambient Reduce room air temperature
Water leak Check purge valve, check curtain
Water inlet valve leaks through Check inlet valve
Low on refrigerant Add refrigerant, if cycle time drops,
check for leak
Incorrect superheat Check evaporator superheat, if
significantly low or high, replace TXV
Fan(s) cycle on and off Check pressures fans cycle at.
Replace fan pressure switch if too low
Long Harvest Cycle Dirty evaporator De-scale water system
No harvest assist Check harvest assist solenoid
Bridge thickness too big Check and adjust bridge thickness
Machine in very cool ambient Increase room temperature
False bin full signal Ice jammed in between curtain and sump Clear ice away
Curtain does not close correctly Check curtain for proper swing
Fan blade vibrates Blade is bent Replace fan blade
Fan motor mount is broken Replace motor mount
Compressor vibrates Mounting bolts loose Tighten bolts
Water pump vibrates Pump bearings worn Replace pump
Panels vibrate Mounting screws loose Tighten screws
DIAGNOSIS