Service Diagnosis; Ice Production Check; Diagnostic Procedure - Hoshizaki C-100BAF-AD Service Manual

IV. Service Diagnosis
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 storage bin.
5. Make sure all food zones in the icemaker and storage bin are clean after
the unit is serviced. For cleaning procedures, see "VI. Cleaning and
Maintenance."
A. Ice Production Check
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. When confirming production
or diagnosing low production, see "III. C. Performance Data" for typical production
information.
B. Diagnostic Procedure
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 7 PSIG, maximum of 113 PSIG), and proper voltage per unit
nameplate. When checking voltage (115VAC), always choose a white (W) neutral wire to
establish a good neutral connection.
1) Move the power switch to the "OFF" position, then unplug the unit from the electrical
outlet.
2) Remove the front panel and louver. Remove the screws securing the control box, then
gently pull the box out. Remove the control box cover.
3) Plug the unit back in. Place the power switch in the "ON" position.
4) Freeze Cycle – GM, FM, CR, and Comp energize. Ice production begins 4 to 6 minutes
after Comp starts depending on ambient and water conditions.
Diagnosis: Check that GM, FM, and Comp start. If not, check the power switch, STS
(see "III.B.3.c) Low Water/Freeze-Up Safety Shutdown"), BC assembly (including
heater), GM protector (external overload) (see "III.B.3.d) Gear Motor Protector (external
overload) Shutdown"), GM thermal protector (internal overload), GM windings, GM
capacitor, voltage to FM, voltage on CR, PTC relay, voltage on Comp terminals, Comp
windings, and Comp thermal protector (external overload). If optional drain pump
HS-0248 is installed, see "IV.D. Optional Drain Pump HS-0248." If GM starts, but the
auger does not turn, check the spline coupling between the auger and GM.
WARNING
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