B. Control Board Check

Before replacing CB that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. Always choose a white neutral wire to establish a good neutral connection when checking voltages.

Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB while it is beeping. WARNING! Risk of electric shock. Care should be taken not to touch live terminals. Once reset, the unit starts at the 1-minute fill cycle. For audible alarm information, see "II.C.2. LED Lights and Audible Alarm Safeties."

1) Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10 and

S5 (KM‑1601SAH/3 "G" CB) dip switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6 are cleaning adjustments and the settings are flexible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings."

2)Move the control switch to the "ICE" position. If CB red "POWER OK" LED is on, the control voltage is good. If CB red "POWER OK" LED is off, clear ice away from TBC bulb in the storage bin area. If no ice is near TBC bulb or CB red "POWER OK" LED does not turn on even after clearing away ice, check TBC. See "IV.C. Bin Control Check." If TBC is okay (closed) and CB red "POWER OK" LED is off, check the fuse, control switch contacts, HPS, and CT secondary circuit. CT output is 10.5V at 115V primary input. If the secondary circuit has proper voltage and CB red "POWER OK" LED is off, CB is bad and should be replaced.

If CT secondary circuit does not have proper voltage, check the CT primary circuit. Check for 115V at CB K1 ten-pin connector. Check the #10 pin (BR wire) to a white neutral wire for 115V. For additional checks, see "IV.G.1. No Ice Production."

3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control

switch is in the "ICE" position, then press the "OUTPUT TEST" button. For the correct lighting sequence, see the table below. Note that the order of the LEDs from the outer edge of CB is 1, 4, 3, 2. Components (e.g., compressor) will cycle during the test.

 

Control

Correct LED

Model

Board

Lighting Sequence

KM-1601SAH/3

"G"

1, 4, 3, 2

 

 

 

KM-1601SWH/3, KM-1601SRH/3

"E"

2, 3, 4, 1

 

 

 

Following the test, the icemaker resumes operation. If the LEDs do not turn on as described above, CB is bad and should be replaced.

4) To verify voltage output from CB to the components, slide CB K1 ten‑pin connector out far enough to allow multimeter lead contact. With the unit in the cycle to be tested, check output voltage from the corresponding pin on CB K1 ten‑pin connector to ground. If output voltage is not present and the appropriate LED is on, CB is bad and must be replaced.

Legend: CB–control board; CT–control transformer; HPS–high-pressure switch; TBC–thermostatic bin control

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Hoshizaki KM-1601SAH/3, KM-1601SWH/3, KM-1601SRH/3 Control Board Check, Control Correct LED Model Board Lighting Sequence
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KM-1601SWH/3, KM-1601SRH/3, KM-1601SAH/3 specifications

Hoshizaki has long been a trusted name in the world of commercial refrigeration and ice-making equipment. Among its offerings, the KM-1601SAH/3, KM-1601SRH/3, and KM-1601SWH/3 models stand out for their innovative features and robust design. These machines are integral for businesses that require reliable and efficient ice production, such as restaurants, hotels, and convenience stores.

At the core of these models is Hoshizaki's renowned Crescent Cube Technology, which produces clear, crescent-shaped ice that is ideal for both beverage service and food presentation. The unique shape of the ice ensures reduced melting rates, helping to maintain beverage temperature for longer periods while minimizing dilution. Additionally, the crescent ice is less prone to clumping, making it easier to dispense and ideal for high-volume use.

One of the key features of the KM-1601 series is its exceptional ice production capacity. Each model can produce up to 1,600 pounds of ice in a 24-hour cycle, making them suitable for heavy-demand environments. The machines are constructed with a durable stainless steel exterior, providing not only a sleek look but also enhanced resistance to corrosion and easy maintenance.

The KM-1601SAH/3 is designed with a built-in ice storage bin, allowing for seamless integration into various setups. Its state-of-the-art refrigeration system ensures optimal energy efficiency, which is crucial for businesses looking to manage operational costs. The KM-1601SRH/3 includes a self-contained design, simplifying installation and reducing the need for external ice storage solutions.

For users concerned with hygiene, these models boast advanced sanitation features. Hoshizaki's Antimicrobial Agent is incorporated into key components to inhibit the growth of bacteria and slime, ensuring cleaner ice production. The machines also feature easy-to-access panels for quick cleaning and maintenance, reducing downtime.

Another significant characteristic is their user-friendly controls, which simplify operation and monitoring of ice production. The built-in monitoring system alerts users to any potential issues, allowing for proactive maintenance and minimal disruption to service.

The KM-1601SWH/3 model further enhances the lineup with its energy-efficient design, lightweight construction, and compact footprint, making it perfect for establishments with limited space. Collectively, these models reflect Hoshizaki's commitment to innovation, efficiency, and reliability in ice-making technology, making them a top choice for businesses that require substantial ice production without compromising on quality or safety. Whether you need a powerful ice machine for a bar, restaurant, or convenience store, Hoshizaki’s KM-1601 series delivers performance that you can depend on.
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