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.
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.