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Hoshizaki IM-series square cuber (models with condenser thermistor) · EE (log code E9)

What does EE (log code E9) mean on a Hoshizaki IM-series square cuber?

Short answer: Condenser thermistor error. If your Hoshizaki IM-series square cuber (models with condenser thermistor) is showing EE (log code E9), 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?

The condenser thermistor circuit read open or shorted for 2 seconds and the unit stopped. Hoshizaki's remedy is thermistor replacement. (Not applicable on IM-500SAA, which has no condenser thermistor; documented for IM models that do.)

Which machines show this?

this fault applies to IM-series square cubers equipped with a condenser thermistor — not every IM model has one (the IM-500SAA, for example, does not), so this code appears only on the models whose refrigeration monitoring includes condenser temperature. Like other IM faults beyond E1/E2, it displays as a generic EE on the 7-segment display with the true code stored in the error log. If a technician quotes you this diagnosis, it's a sensor replacement — one of the more contained repairs on these machines.

What causes it?

  • The condenser thermistor circuit reading open or shorted for 2+ seconds
  • A damaged sensor lead
  • A failed thermistor

Can you fix it yourself?

One power-cycle. Note that this code only exists on IM models equipped with a condenser thermistor — if a tech quotes it for a model without one, ask questions.

Step by step — what to try, in order:

  1. Power-cycle once to see if the reading was transient
One reset is diagnosis, repeated resets are damage. If the same fault returns after a single reset, the underlying condition is real — stop resetting and deal with the cause.

What to check before you call

  • One power-cycle — Hoshizaki's listed first step for E9. It rules out a transient open or short reading.
  • Whether E9 returns after the reset — A persistent E9 means the condenser thermistor must be replaced by a technician. Further resets won't change a failed sensor or damaged lead.
  • That this model actually has a condenser thermistor — E9 is documented for IM models that have a condenser thermistor, not for every IM. The IM-500SAA, for example, does not have one — if a technician quotes E9 for a model without that sensor, ask questions.
  • Leave the panels closed — The condenser thermistor sits in the refrigeration section. Replacement is confirmed with a resistance test, which is technician work behind the panel.

When do you need a technician — and why?

Sensor replacement in the refrigeration section, verified with a resistance test — small, precise, and behind the panel.

When to call: A persistent E9 means the condenser thermistor must be replaced by a technician.

Parts a technician may look at

Based on the causes listed for this code (not a parts order — a tech confirms first):

  • Condenser thermistor
  • Sensor lead or thermistor wiring

What might it cost?

Typically a service call plus a modest part. When a technician is needed, this is usually a diagnostic visit plus a sensor, switch, valve, or similar small component. A rough, hedged range is a few hundred dollars in total — often in the $200–$500 band — but parts prices and labor rates vary a lot by model and area. Get a quote.

These are rough, typical ranges, not quotes; we don't have pricing data for your area or your exact model.

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 EE (log code E9) mean on a Hoshizaki IM-series square cuber (models with condenser thermistor)?

Condenser thermistor error. The condenser thermistor circuit read open or shorted for 2 seconds and the unit stopped. Hoshizaki's remedy is thermistor replacement. (Not applicable on IM-500SAA, which has no condenser thermistor; documented for IM models that do.)

Can I fix EE (log code E9) on a Hoshizaki IM-series square cuber (models with condenser thermistor) myself?

One power-cycle. Note that this code only exists on IM models equipped with a condenser thermistor — if a tech quotes it for a model without one, ask questions.

When does EE (log code E9) on a Hoshizaki IM-series square cuber (models with condenser thermistor) need a technician?

Sensor replacement in the refrigeration section, verified with a resistance test — small, precise, and behind the panel. A persistent E9 means the condenser thermistor must be replaced by a technician.

Does every Hoshizaki IM show EE with log code E9?

No. E9 applies only to IM-series square cubers equipped with a condenser thermistor. It is not applicable on the IM-500SAA, which has no condenser thermistor. If a technician quotes E9 for a model without one, ask questions.

How is E9 different from EE with log code EC on a Hoshizaki IM?

Both display as EE, with the true code stored in the error log (codes other than E1 and E2 display that way). E9 is a condenser thermistor circuit that read open or shorted for 2 seconds. EC is the same kind of open-or-short reading, but on the evaporator (cube control) thermistor. Hoshizaki's remedy for either persistent code is thermistor replacement.

Source: IM-500SAA_serv_LTR.pdf (hoshizakiamerica.com)

Related codes and guides

All Hoshizaki codes: Hoshizaki error code hub.