Why is my Hoshizaki ice machine beeping 6 times?
Short answer: Low supply voltage. If your Hoshizaki KM-series Crescent Cuber is showing 6 beeps, the controller has logged a specific, documented condition. This page covers what it means, what causes it, what you can safely fix yourself, and when — and why — it takes a technician.
What exactly is the machine telling you?
Supply voltage has dropped below 92VAC (±5%), so the control board shuts the unit down to protect itself. It resets automatically when proper voltage returns; the red POWER OK LED turns off while the protection is active.
Which machines show this?
Hoshizaki's KM-series crescent cubers are the workhorses of the brand — the machines behind thousands of bars, restaurants, and hotel pantries, many running past the ten-year mark. KM machines have no error code display: the control board sounds a repeating beep alarm, and the number of beeps between pauses is the diagnosis. Open the front panel area, listen, and count. The board also carries LEDs (including the red POWER OK light) that a technician reads for deeper diagnosis. One habit worth building: KM machines live and die by water quality — the float switch and evaporator collect scale, and the majority of KM alarms in hard-water areas trace back to cleaning, not components.
What causes it?
- Building supply voltage sagging to 92VAC or below
- An overloaded shared circuit browning out under load
- Utility-side voltage problems
Can you fix it yourself?
The detective work, yes: note what else runs when it trips, confirm the machine has a dedicated circuit, and wait — this alarm resets itself when voltage recovers. There is nothing wrong with the ice machine.
Step by step — what to try, in order:
- Check whether other equipment on the same circuit is browning out
- Make sure the ice machine is on its own dedicated circuit, not a shared or overloaded one
- Wait — the alarm auto-resets when voltage returns to normal
When do you need a technician — and why?
Recurring low voltage is an electrical-supply problem: an electrician needs to measure the circuit under load and fix the wiring or loading. An ice machine tech can only tell you what the electrician will — and chronic undervoltage shortens the life of every motor in the building, not just this one.
If it does come to a service call and you're in Nashville, TN or Birmingham, AL, we maintain independently compiled lists of local companies that service commercial ice machines — real businesses with verified contact information, none of whom paid to be listed.
Likely causes, most to least common
- A shared or overloaded circuit. The most common pattern: the alarm lines up with something else starting on the same circuit or panel, such as a walk-in compressor, a dishwasher booster heater, a fryer, or HVAC. A large motor starting pulls voltage down for a moment, and if the line is already marginal the board sees the dip and protects itself.
- Undersized or long wiring, or loose connections. A run that's too long for the wire gauge, a loose lug in the panel, a worn receptacle, or an extension cord all drop voltage under load even when the panel itself reads fine at idle.
- Building-wide or utility-side low voltage. Hot afternoons when the whole building, or the whole block, is drawing hard. If lights dim and other equipment misbehaves at the same time, the problem isn't inside your walls.
- An internal supply problem (least likely). If an electrician confirms good voltage at the machine's connection and the alarm keeps coming, the fault is between that point and the board: the machine's own wiring or the control transformer. The red POWER OK LED is your clue here.
Step-by-step checks an owner or tech can do
- Note the timing. Write down when the alarm happens: time of day, and what else had just started. Two or three logged events tell an electrician more than a single reading.
- Look at the POWER OK LED. It goes out while low-voltage protection is active and comes back once voltage recovers. LED off with the alarm, then back on by itself, confirms the board is reacting to supply voltage and not some other fault.
- Find the breaker and see what else is on it. Panel directories are often wrong, so if you're unsure, have someone watch the machine while another person switches off nearby equipment, but only equipment that's safe to turn off.
- Remove extension cords and power strips. A commercial ice machine should be plugged straight into a properly rated receptacle or hard-wired. If it isn't, that's very likely your answer.
- Let it reset itself. This alarm clears on its own when voltage returns. Don't keep power-cycling it, since that doesn't fix the supply.
- Measuring voltage is a qualified job. A tech or electrician measures at the machine's supply while it's running and while the suspect load starts. Measuring with the machine idle can miss the sag entirely.
Parts involved
Usually none on the ice machine. The board's voltage protection is working as designed. What gets fixed is upstream: the breaker or circuit, the wiring run, panel connections, or the receptacle. Only after the supply checks out good at the machine do the machine's own components come into it: the control transformer, which feeds the board its control voltage, the internal wiring and connections, and the control board itself.
What it typically costs
These are rough, typical US ranges, not quotes. Labor rates vary a lot by market, so get a written estimate.
- Electrician diagnostic visit (measuring the circuit under load): typically a standard service-call fee, often in the low hundreds of dollars.
- Tightening connections or replacing a receptacle: usually a small add-on to that visit.
- Running a new dedicated circuit: commonly several hundred dollars and sometimes more than $1,000, depending on distance to the panel, panel capacity, and local code requirements.
- Utility-side problems: often cost you nothing. Report repeated low voltage to your power company, which is responsible for the service up to your meter.
Calling an ice machine technician first for this code often just adds a trip charge before you're sent to an electrician anyway. Call one first only if your electrician has already confirmed the supply is good.
When to call a pro
- The alarm comes back more than occasionally, or on a pattern. That's an electrician.
- You see scorching, smell burning, or feel heat at a plug, cord, or breaker. Shut the circuit off and call an electrician right away.
- Supply voltage measures good at the machine and the alarm continues. That's an ice machine technician, who will check the transformer, wiring, and board.
Related codes on the same machine
- 7 beeps: high supply voltage, the opposite condition (147VAC ±5% or more), often a high-leg wiring problem on three-phase services.
- POWER OK LED off: the board isn't getting correct control voltage. It goes out during 6-beep and 7-beep protection.
- 3 beeps: long freeze cycle and 2 beeps: long harvest, the most common non-electrical KM alarms.
- Have a dispenser instead? The DCM-270BAH uses 6 beeps for low voltage too.
- Not sure which beep count you're hearing? Start with why is my Hoshizaki ice machine beeping, or browse every Hoshizaki code.
Related questions
What does 6 beeps mean on a Hoshizaki KM-series Crescent Cuber?
Low supply voltage. Supply voltage has dropped below 92VAC (±5%), so the control board shuts the unit down to protect itself. It resets automatically when proper voltage returns; the red POWER OK LED turns off while the protection is active.
Can I fix 6 beeps on a Hoshizaki KM-series Crescent Cuber myself?
The detective work, yes: note what else runs when it trips, confirm the machine has a dedicated circuit, and wait — this alarm resets itself when voltage recovers. There is nothing wrong with the ice machine.
When does 6 beeps on a Hoshizaki KM-series Crescent Cuber need a technician?
Recurring low voltage is an electrical-supply problem: an electrician needs to measure the circuit under load and fix the wiring or loading. An ice machine tech can only tell you what the electrician will — and chronic undervoltage shortens the life of every motor in the building, not just this one. If it recurs regularly, have an electrician check the circuit and supply voltage.
Will 6 beeps damage my Hoshizaki ice machine?
The shutdown protects the machine. Running motors and the compressor on low voltage is what causes damage, and the board stops that from happening. The real risk is a supply problem that goes on for weeks, because it stresses every motor on that circuit, not just the ice machine.
Do I need to reset a Hoshizaki KM after 6 beeps?
No. Hoshizaki documents this alarm as resetting itself when supply voltage returns to normal. If it won't come back on its own, or keeps repeating, the supply needs to be measured.
Should I call an ice machine tech or an electrician for 6 beeps?
Usually an electrician. Low supply voltage is a building circuit problem. Call an ice machine technician once an electrician has confirmed the voltage at the machine is good and the alarm still happens.