Hoshizaki KM-900MRF Manual De Usuario

43

  PROBLEM

         POSSIBLE CAUSE

 REMEDY

[1] Freeze cycle

a) See chart 1 - [3], and check dirty Air Filter or Condenser, ambient or water

     time is long.

     temperature, water pressure, Water Regulator or refrigerant charge.
b) See chart 2 - [1], and check Float Switch, Water Solenoid Valve or Controller
     Board.

[2] Harvest cycle

a) See chart 2 - [2], and check Controller Board, Thermistor, Evaporator, ambient

     time is long

     and/or water temperature, water supply line, Water Solenoid Valve, Line Valve.

  PROBLEM

         POSSIBLE CAUSE

 REMEDY

[1] Freeze cycle

a) Float Switch

1. Leads short-circuit or

1. Check and replace.

     time is too

    defective switch.

     long.

2. Float does not move freely.

2. Clean or replace.

b) Water Solenoid

1. Diaphragm does not close.

1. Check for water leaks

     Valve

     with icemaker off.

c) Controller Board

1. Defective.

1. See “II.2[e] CHECKING
    CONTROLLER BOARD.”

[2] All ice formed

a) Evaporator

1. Scaled up.

1. Clean.

     on Evaporator b) Water Supply Line

1. Water pressure too low.

1. Check and get

     does not fall

     recommended pressure.

     into bin in          c) Water Solenoid

1. Dirty mesh filter or orifice.

1. Clean.

     harvest cycle.

    Valve

2. Diaphragm does not close.

2. Check for water leaks
    with icemaker off.

d) Ambient and/or

1. Too cool.

1. Increase temperature.

    water temperature
e) Line Valve

1. Continues to open in

1. Check operation in

     harvest cycle.

    harvest cycle and replace.

f) Thermistor

1. Out of position or loose          1. See “V. 11. REMOVAL
     attachment.

    AND REPLACEMENT OF
    THERMISTOR.”

g) Controller Board

1. Defrost Timer is set too

1. Adjust longer, referring

              short.

     to “II. 2. [d] CONTROLS
     AND ADJUSTMENT, 2)
     Defrost Timer.”

2. Defective.

2. See “II. 2.[e] CHECKING
    CONTROLLER BOARD.”

[3] Others

a) Spray Tubes

1. Clogged.

1. Clean.

2. Out of position.

2. Place in position.

b) Water System

1. Dirty.

1. Clean.

c) Refrigerant

1. Undercharged.

1. Check for leaks and
     recharge.

d) Expansion Valve

1. Bulb out of position or

1. Place in position.

    loose attachment.
2. Defective.

2. Replace.

e) Hot Gas Solenoid

1. Coil winding opened.

1. Replace.

     Valve

2. Plunger does not move.

2. Replace.

3. Wiring to Hot Gas Valve.

3. Check for loose
     connection or open, and
     replace.