Hoshizaki DCM 300BAH(-OS) service manual F. Diagnostic Charts, No Ice Production

F. Diagnostic Charts

Before consulting the diagnostic charts, check for correct installation, proper voltage per unit nameplate, and adequate water pressure (10 to 113 PSIG). Check CB using the steps in "IV.C. Control Board Check."

1. No Ice Production

	Startup
1. Power Supply	a) Off, blown fuse, or tripped breaker.
	b) Not within specifications.
2. Water Supply	a) Water supply off or improper water pressure.
	b) External water filters clogged.
3. Power Switch	a) "OFF" position or defective.
4. Safety Switch	a) Not engaged or defective.
5. Power Protect Relay	a) Voltage not within specifications.
	b) Defective.
6. Control Transformer	a) Coil winding open or shorted.
(115VAC, 24VAC, and 10.5VAC)
7. 1A Fuse (24VAC Control Board)	a) Blown.
8. .5A Fuse (10.5VAC Control	a) Blown.
Board)
9. Control Board	a) Defective.
See "IV.C. Control Board Check"
10. Control Switch	a) In "OFF" or "DRAIN" position.
	b) Defective.
11. Bin Control	a) Tripped with bin filled with ice.
	b) Proximity switch stuck open.
	c) Actuator paddle does not move freely.
12. High-Pressure Switch	a) Dirty condenser.
	b) Ambient temperature too warm.
	c) Fan motor not operating.
	d) Refrigerant overcharged.
	e) Bad contacts.
	f) Refrigerant lines or components restricted.
	Fill Cycle
1. Water Control Relay	a) Energized (upper float switch stuck closed).
	b) Defective.
2. Inlet Water Valve	a) Screen or orifice clogged.
	b) Coil winding open.
3. Float Switch	a) Float does not move freely.
See "IV.E. Float Switch Check
	b) Defective.
and Cleaning"

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