Hoshizaki DKM-500BAH service manual Diagnostic Charts, Ice Making, No Ice Production

conditions. Cycle times and pressures should follow performance data provided in this manual.

6)Pump-Out Cycle (10/20 second pump out) – the compressor remains energized, the hot gas valve energizes, the fan motor de-energizes, the pump motor stops for

2 seconds. The service relay energizes, restarting the pump motor and taking water from the sump and forcing it to go through the drain valve and down the drain for 10/20 seconds. This removes contaminants from the water reservoir. Check for clear tubing at the drain valve housing and check the unit drain for water flow. Diagnosis: If the pump motor does not run, check the circuit, service relay and capacitor. Check for proper voltage. If water does not pump out, remove the drain valve and check/clean the valve assembly.

7)Normal Harvest Cycle – same as the initial harvest cycle – Return to step 4.

Note: Unit continues to cycle until bin control is satisfied or power is switched OFF. (The pump out cycle can be adjusted to occur every cycle, or every 2, 5, or 10 cycles. The factory default is every 10 cycles.) The unit always restarts at the 1 minute fill cycle.

B. Diagnostic Charts

1. Ice Making

a) No Ice Production

Problem	Possible Cause		Remedy
[1] The icemaker will not	a) Power Supply	1. OFF position.	1. Move to ON position.
start.
		2. Loose connection.	2. Tighten.
		3. Bad contacts.	3. Check for continuity and
			replace.
		4. Voltage too high.	4. Check and get
			recommended voltage.
	b) Fuse (Inside fused	1. Blown.	1. Check for short circuit and
	disconnect, if any)		replace.
	c) Control Switch	1. OFF position.	1. Move to ICE position.
		2. Bad contacts.	2. Check for continuity and
			replace.
	d) Bin Control	1. Tripped with bin filled	1. Remove ice.
	See the information	with ice.
	to the right and also
		2. Bad contacts (stuck	2. Check for continuity and
	see "II.C.4. Bin Control
	Troubleshooting."	open).	replace.
		3. Resistor wire harness.	3. Check resistance. Should
			be approximately 7.9 KΩ
			when calling for ice
			(proximity switch closed).
	e) High Pressure Control	1. Bad contacts.	1. Check for continuity and
			replace.
		2. Dirty air filter or	2. Clean.
		condenser.
		3. Ambient temperature	3. Reduce temperature.
		too warm.

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