Hoshizaki KM-901MAH Manuel D’Utilisation

66

[] Freeze cycle time is 

long. (continued)

n) Control Board

. Float switch 

connection loose (K5).

. Check and reconnect.

. Defective.

. See "IV.B. Control Board 

Check." 

[] Harvest cycle time is 

long.

a) Water Supply

. Water temperature too 

cold.

. Increase temperature.

b) Thermistor

. Disconnected, loose, 

or defective.

. Connect, secure, check. 

See "V.L. Removal 
and Replacement of 
Thermistor" and "IV.E. 
Thermistor Check."

c) Control Board

. Not reading 

thermistor.

. Check and replace. See 

"IV.E. Thermistor Check."

. Sending voltage to 

liquid line valve (if 
applicable) in harvest.

. Check and replace. See 

"IV.B. Control Board 
Check." 

d) Inlet Water Valve

. Clogged.

. Clean or replace.

e) Evaporator

. Scaled up.

. Clean.

. Damaged.

. Replace.

f) Hot Gas Valve 

. Does not open, or 

opens partially.

. Check and replace.

g) Expansion Valve

. Wide open in harvest. . Check and replace.
. Bulb loose.

. Secure bulb.

h) Water Regulating Valve 

(water-cooled model)

. Open during harvest. . Adjust or replace. See 

"V.J. Adjustment of Water 
Regulating Valve."

i) Liquid Line Valve (if 

applicable)

. Open during harvest 

cycle.

. Check and replace.

[] Small cubes.

a) Pump-Out Check Valve . Dirty or worn and 

leaking by.

. Clean or replace.

b) Ice Cube Guide

. Out of position. 

Circulated water falls 
into bin.

. Place in position.

c) Water System

. Water supply line too 

small; requires 3/8" 
OD line dedicated per 
machine.

. Increase water line size.

. Water filter clogged or 

flow rate too small.

. Replace filter or install a 

higher flow rate filter.

d) Inlet Water Valve

. Dirty mesh filter or 

orifice.

. Clean.

e) Pump Motor

. RPM too slow.

. See chart .[5].

f) Control Board

. Defective.

. See "IV.B. Control Board 

Check."