Hoshizaki FS-1022MLH-C User Manual

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1. This unit should be diagnosed and repaired only by qualified service 

personnel to reduce the risk of death, electric shock, serious injury, or fire.

2. Risk of electric shock. Use extreme caution and exercise safe electrical 

practices. 

3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
4. 

CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews 
are securely in place after the unit is serviced. Make sure that none have 
fallen into the dispenser unit/storage bin.

5. Make sure all food zones in the icemaker and dispenser unit/storage bin are 

clean after the unit is serviced. For cleaning procedures, see "VI. Cleaning
and Maintenance."

To check production, prepare a bucket or pan to catch the ice and a set of scales to 
weigh the ice. After the icemaker has operated for 10 to 20 minutes, catch the ice 
production for 10 minutes. Weigh the ice to establish the batch weight. Multiply the batch 
weight by 144 for the total production in 24 hours.

This diagnostic procedure is a sequence check that allows you to diagnose the electrical 
system and components. Before proceeding, check for correct installation, adequate 
water supply (minimum of 10 PSIG, maximum of 113 PSIG) and proper voltage per unit 
nameplate. Check that the 24VAC 1A fuse and the 115VAC 3A GM fuse are good. When 
checking for high-voltage (115VAC), always choose a white (W) neutral wire to establish 
a good neutral connection. When checking for low-voltage (secondary) (24VAC), always 
choose a light blue (LBU) neutral wire to establish a good neutral connection. If the 
icemaker is in alarm, see "II.C.2. LED Lights and Audible Alarm Safeties."

Note: EH energizes when "GM" LED turns on. CB X1 Comp relay energizes PDS.

Pressure rises in the refrigeration system and closes CLPS. MC is energized 
when CLPS closes, energizing Comp and FMR. 

1) Remove the front panel, then move the power switch to the "OFF" position.
2) Unplug the icemaker from the electrical outlet.
3) Remove the control box cover and access CB.
4) Check the S1 dip switch settings, see "II.C.3.a) Default Dip Switch Settings" to assure

that they are in the correct positions. For proper operation of IS, confirm that S1 dip 
switch 7 is in the "ON" position.

5) 

Startup – "POWER OK" LED is on. Plug the icemaker into the electrical outlet, then 

move the power switch to the "ON" position. Move the control switch to the "ICE"
position. CB "POWER OK" LED and IS green LED should be on.

OK" LED: CB  POWER OK" LED is off. Check for proper supply voltage (115VAC) input
to the control transformer. If 115VAC is not present, check the power switch and breaker. 
Next, check for proper 24VAC outpout voltage from the control transformer. Check CB