Hoshizaki DCM-500BWH-OS service manual Opti Serve OS Sensors

Problem	Possible Cause		Remedy
[3] No water dispensed.	a) Power Supply	1. "OFF" position.	1. Move to "ON" position.
	b) Water Supply	1. Water supply off or	1. Check and get
		pressure too low.	recommended pressure.
	c) Dispensing Water	1. Coil winding open.	1. Replace.
	Valve	2. Wiring to dispensing	2. Check for loose or open
		water valve.	connection. Repair or
			replace.
	d) Control Board	1. Defective.	1. See "II.D.4. Control
			Board Check Procedure."
	e) Water Dispense Switch	1. Opti Serve sensor	1. See "5. Opti Serve (OS)
		defective. (OS only)	Sensors."
		2. Bad contacts. (push	2. Check for continuity and
		button only)	replace.

5. Opti Serve (OS) Sensors

Be sure to check all items in section "IV.C.4. Dipsensing" prior to using this chart. Use the following charts along with the wiring diagram to troubleshoot the OS sensors.

Problem	Possible Cause		Remedy
[1] No ice dispensed.	a) OS Sensor	1. Dirty sensor.	1. Clean, using Scale Away
			(6 fl. oz. (0.8 l) per 1 gal.
			(3.8 l) of water) or other
			non‑abrasive cleaner.
		2. Defective.	2. See chart 5a and 5b
			below.
	b) Dispense Mode Switch	1. Wrong setting.	1. Move to desired setting.
		2. Bad contacts.	2. Check for continuity and
			replace.
		3. Loose connection.	3. Tighten.
	c) Control Board	1. Loose connection.	1. Tighten.
		2. Defective.	2. See "II.D.4. Control
			Board Check Procedure"
			and chart 5a and 5b
			below.
[2] No water dispensed.	a) OS Sensor	1. Dirty sensor.	1. Clean.
		2. Defective.	2. See chart 5c below.
	b) Dispense Mode Switch	1. Wrong setting.	1. Move to desired setting.
		2. Bad contacts.	2. Check for continuity and
			replace.
		3. Loose connection.	3. Tighten.
	c) Control Board	1. Loose connection.	1. Tighten.
		2. Defective.	2. See "II.D.4. Control
			Board Check Procedure"
			and chart 5c below.

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