What does EE (log code E5) mean on a Hoshizaki IM-series square cuber?
Short answer: High evaporator temperature. If your Hoshizaki IM-series square cuber (IM-500SAA and similar) is showing EE (log code E5), 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 evaporator thermistor detected a sustained abnormally high temperature and the unit stopped. Listed causes: a harvest problem such as a stuck hot gas valve or control board relay, hot water entering the unit, or a shorted thermistor.
Which machines show this?
Hoshizaki's IM-series square cubers (the IM-500SAA and its siblings) make the clear, square cubes bars prize — and unlike the KM crescent cubers, they have a 7-segment display that shows real codes. The display logic takes one minute to learn: E1 and E2 display directly (freeze and harvest backup timers), while every other fault shows as a generic EE with the true code stored in the error log for a technician to read. So if your IM shows EE, the display has told you something is wrong but not what — note any pattern in the machine's behavior (stopping mid-cycle, water tank movement) for the service call, and don't burn resets trying to make EE explain itself.
What causes it?
- A harvest problem overheating the evaporator: stuck hot gas valve or board relay
- Hot water feeding the machine
- A shorted thermistor reading falsely high
Can you fix it yourself?
The plumbing check — confirm no hot water reaches the machine — then RESET and one monitored cycle.
Step by step — what to try, in order:
- Confirm no hot water is feeding the machine
- Press the RESET button and monitor one full cycle
When do you need a technician — and why?
Valve, relay, and thermistor each need individual testing to find which one overheated the evaporator; the tech's meter and gauges answer in sequence what guessing answers by expensive elimination.
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 E5) mean on a Hoshizaki IM-series square cuber (IM-500SAA and similar)?
High evaporator temperature. The evaporator thermistor detected a sustained abnormally high temperature and the unit stopped. Listed causes: a harvest problem such as a stuck hot gas valve or control board relay, hot water entering the unit, or a shorted thermistor.
Can I fix EE (log code E5) on a Hoshizaki IM-series square cuber (IM-500SAA and similar) myself?
The plumbing check — confirm no hot water reaches the machine — then RESET and one monitored cycle.
When does EE (log code E5) on a Hoshizaki IM-series square cuber (IM-500SAA and similar) need a technician?
Valve, relay, and thermistor each need individual testing to find which one overheated the evaporator; the tech's meter and gauges answer in sequence what guessing answers by expensive elimination. If E5 returns, the hot gas valve, relay, or thermistor needs professional testing.