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viking ice machine by marvel with drain valve
Quick suggestions on what to look for: (*For more detailed diagnostic help please see the service manual)
1. Is the machine making too much ice? Check the bin thermistor resistance values and compare to chart.
2. Is the machine not running at all? Check the bin and evaporator thermistor resistance values and compare to chart. Either thermistor if open, shorted, or outside of a
parameter range will shut down all loads to the machine. For the bin thermistor tbat range is 25 -140 F. and for the evaporator thermistor 0 -140 F.
3. Is the machine making a thick slab ofice but not going into harvest mode? Check the evaporator thermistor resistance values and compare to chart. Be sure the
thermistor is tight to the bracket on the underside of the evaporator and that the bracket welds are not cracked or broken.
4. Is the machine making thin slabs of ice? Check that the drain valve is seating properly. A “leak by” condition will cause water to drain from the reservoir during the
production cycle. With water escaping the reservoir the circulation pump will begin struggling to pick up water to pump over the plate usually making a distinct
gurgling sound as the impeller picks up air and water together. Water should not leave the reservoir until the beginning of the harvest cycle. *Do not confuse normal ice
water melt off from the bin with water escaping from the reservoir due to a leaking drain valve. Normal production cycle times for this machine is between 45 and 90
minutes. Cycle times considerably less resulting in thin slabs and a noisy circularion pump is typically due to a leaking drain valve.
5. Is the machine stacking slabs on the cutter grid? Check to see if the machine is in~talled with a Marvel drain pump. If it is the drain pump may be at fault causing
minor power interruptions thus never allowing the machine to go into a harvest cycle. This would prevent the cutter grid from being activated and the slabs would stack.
6. Is the machine running water over the plate but is not cooling? If the compressor is not running check that the machine is not set in the clean position. Check the
wiring to the ON 1OFFI CLEAN switch to determine if they have been reversed. Compare to the diagram on the fan shroud behind the grille.
7. Is the machine running, getting cold, bringing water into the reservoir but water i~ notflowing over the plate? Check the circulation pump 3 proug plug is fully seated
into the electrical receptacle located in tbe I’ear “:l!.!