Hoshizaki Ice Machine Water Inlet Valve Replacement: OEM vs Compatible and Model Fitment

commercial ice machine filters, cleaners, and replacement parts  · 

Inlet water valve vs every other valve on a crescent cuber

On Hoshizaki modular crescent cuber machines, the inlet water valve (service literature abbreviates it WV) is the electrically operated solenoid that admits house water into the water tank during the 1-minute fill cycle and early harvest. It sits on the water circuit upstream of the float switch, spray tube, and pump motor assembly—not on the refrigeration circuit.

That distinction matters because Hoshizaki uses several other “water valves” on the same machine. Water-cooled models carry a water regulating valve on the condenser loop. Every machine has a cleaning valve for sanitizer routing, plus drain valve parts in the reservoir drain path. None of those interchange with the inlet water valve listed as item 11 or 13 in Section B. Water Circuit of the illustrated parts list.

During normal ice production the control board energizes WV through K1 connector pin #6 while LED 4 is on. Service diagnostics expect 115VAC at the valve during fill when the coil is called. If water never enters the tank despite open supply, clogged external filtration, or a stuck float switch, the symptom can resemble a bad WV—so confirm which device actually failed before you order.

How to lock the correct Hoshizaki part number before you shop

Hoshizaki does not publish one universal inlet valve for the whole line. Fitment lives in the model-specific parts list at hoshizakiamerica.com: enter the full model with dashes (example format KM-515MAH), open the PDF, and read Section B. Water Circuit.

On KM-515M_H parts lists, item 11 is Inlet Water Valve. Older KM-515MAH builds call for 3U0111-04 through mid auxiliary codes; later production and KM-515MWH/MRH rows move to 3U0111-03. Current KM-515MAJ/MWJ/MRJ manuals show 3U0111-03 for the G-1 auxiliary code.

Newer KM-350/420/520/660 modular units list item 13 as Inlet Water Valve with 3U0111-03 or 3B1433-03 depending on the auxiliary code column—those first two characters of the serial (year letter plus revision digit) pick the correct row. Hoshizaki notes that most assemblies cannot be ordered complete; you replace the valve body and coil as the manual specifies, not a bundled water-circuit kit.

If your model is outside the modular crescent family—Serenity, stackable, or DCM lines—the Section B page will show a different part number. Treat another machine’s Amazon listing as a hint only until your PDF row matches.

Electrical and hydraulic specs that must match

The modular crescent service manual troubleshooting path for “no water entering the tank” checks 115VAC at WV, then coil continuity. That aligns with machines whose nameplate lists 115VAC supply, though remote and high-voltage models may feed the control through a main transformer while the solenoid still sees control-board switched voltage. Read the nameplate electrical specifications on your cabinet; do not assume a valve from a different Hoshizaki series shares the same coil.

Hydraulically, the inlet valve mounts on the water supply pipe with rubber gasket 413854-03 called out beside it on KM-515 water-circuit pages. Port orientation, body length, and inlet screen geometry must clear the water supply tee and bracket layout. A compatible part that fits the threads but blocks the pump flange or spray guide clearance will fail in the field even when the coil energizes.

Flow timing is controlled by firmware, not by the valve’s marketing copy. WV may stay energized across repeated 1-minute fill attempts until the float switch closes—up to the manual’s maximum inlet time during harvest on some control boards. A valve that opens slowly because of a restricted screen or orifice can leave the float open and stall the harvest transition.

OEM Hoshizaki vs compatible aftermarket

OEM valves ship in Hoshizaki packaging with the factory part number molded or printed on documentation—3U0111-03, 3U0111-04, 3B1433-03, and so on. Authorized channels tie that number to the illustrated index in the parts breakdown.

Compatible ice-machine repair parts typically advertise “for Hoshizaki” and may add a suffix such as -01CM while referencing the OEM number they claim to replace. That can be legitimate on a budget, but the burden is on you to verify: coil voltage class, connector pigtail length, plunger stroke, and whether the inlet strainer matches the OEM footprint. Aftermarket listings sometimes collapse 3U0111-01, -03, and -04 into one photo; those suffixes are not interchangeable on KM crescent rows tied to auxiliary code breaks.

Paying more for OEM mainly buys label certainty and the exact gasket seat Hoshizaki drew on the water supply pipe drawing. Compatible wins when you have already confirmed the part number on the removed valve, photographed the coil label, and compared port dimensions. Neither choice fixes upstream issues—commercial ice machine filter cartridges scaled out, low supply pressure, or a dirty cleaning valve seat will mimic inlet failure after any swap.

Failure signatures that actually point at WV

Hoshizaki’s diagnostic tables list inlet water valve causes under no ice production, freeze-up, and low ice production. The patterns differ:

What usually is not WV: a float switch that reads closed when empty (scale on the shaft), a pump motor capacitor failure (no circulation over the evaporator plate), or a water regulating valve issue on MWH models only. Run the float and fill checks in the service manual before you buy a solenoid.

Replacement workflow and post-repair checks

Work like a tech, not a parts swapper. Move the control switch to OFF, lock out power, and relieve house pressure at the line shut-off upstream of any filtration skid. Place a towel under the water supply pipe; residual water in the bypass hose and suction hose will drain when you break the fitting.

Remove the old inlet water valve, transfer any reusable hardware only if the manual shows it as separate (most gaskets are one-time). Install the new valve with the 413854-03 gasket or equivalent thickness; do not overtighten copper-adjacent fittings and crack the reducing pipe.

Restore power, set ICE, and watch the first 1-minute fill cycle: LED 4 on, audible fill into the tank, float switch closing, then transition to harvest. If fill never completes, repeat voltage and coil checks before returning the part.

Schedule preventive maintenance on the same visit: run approved ice machine cleaner and sanitizer through the WASH position per Hoshizaki guidance, inspect the inlet strainer, and confirm filter head pressure drop is acceptable so the new valve does not immediately scale shut. Document the machine model number, serial number, and auxiliary code on the service label for the next owner.

FAQ

Can I use a 3U0111-01 valve on a KM-515MAH that lists 3U0111-04 in the parts manual?

No—treat the illustrated Section B row and auxiliary code column as authoritative. KM-515MAH manuals specify 3U0111-04 for many S-through B codes, then 3U0111-03 for later builds; suffix -01 belongs to other manual rows. Match the number beside Inlet Water Valve for your serial, not a marketplace title.

How do I tell an inlet water valve from a water regulating valve on a Hoshizaki?

On water-cooled modular cubers (MWH), the water regulating valve lives on the refrigeration condenser loop in Section A, while the inlet water valve feeds the icemaking water tank in Section B. Air-cooled MAH machines have no condenser regulating valve—only the inlet solenoid on the supply line.

When is a compatible inlet valve acceptable instead of OEM?

When you have verified the exact factory part number on the removed valve, confirmed 115VAC coil class matches your nameplate and service checks, and compared port and strainer geometry to the OEM drawing. If an aftermarket listing blends multiple 3U0111- suffixes or skips auxiliary code guidance, stay OEM or walk away.