Hoshizaki 73180 service manual Diagnostic Charts, No Ice Production Possible Cause Startup

F. Diagnostic Charts

The diagnostic charts below list possible reasons for problems with ice production and shutdown. Before consulting the diagnostic charts, check for correct installation, proper voltage per unit nameplate, and adequate water supply.

1. Auxiliary Codes A-1 and Earlier

No Ice Production - Possible Cause

	Startup
1. Power Supply	a) Unplugged, off, blown fuse, or tripped breaker.
	b) Not within specifications.
2. Power Switch	a) "OFF" position.
	b) Bad contacts.
3. Bin Control Thermostat Assembly	a) Open with bin filled with ice.
(with integrated heater)
NOTICE! Some units contain	b) Ambient temperature too cool.
a sticker that states: "The
	c) Out of position.
bin control heater has been
disconnected. DO NOT
	d) Out of adjustment. See "IV.C. Bin Control Check."
reconnect the bin control
heater." In this case, leave
	e) Bad contacts.
the bin control heater
disconnected or replace
	f) Bad thermostat heater (if applicable).
the bin control thermostat
assembly with 3A2561A03.
4. Optional Drain Pump HS-0248	a) Open.
Safety
	Freeze Cycle
1. Water Supply	a) Water supply off or improper water pressure.
	b) External water filters clogged.
2. Gear Motor	a) Gear motor external protector (2.4~3.0A) tripped.
	b) Gear motor internal protector open or windings open.
	c) Bad gear motor capacitor.
	d) Locked bearings.
	e) Spline coupling or gear broken and auger not turning.
3. Suction Temperature Safety	a) Open due to water supply cut-off.
(Low Water/Freeze-Up Safety)
	b) Open due to evaporator freeze‑up (gear motor not operating).
	c) Bad contacts.
4. Fan Motor	a) Motor winding open.
	b) Bearing worn out or locked rotor.
	c) Fan blade does not move freely.
5. Compressor Relay	a) Open coil.
	b) Open contacts.
6. Compressor	a) Compressor external protector open or defective.
	b) Motor winding open.
	c) PTC relay contacts bad or coil winding open.
	d) Inefficient.

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