What does E2 mean on a Hoshizaki IM-series square cuber?
Short answer: Harvest cycle backup timer. If your Hoshizaki IM-series square cuber (IM-500SAA and similar) is showing E2, 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 harvest backup timer expired before the harvest termination temperature was reached, so the unit stopped. Listed causes: open thermistor, hot gas valve not opening, expansion valve leaking by, low charge, or an inefficient compressor. E2 shows directly on the display.
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?
- An open thermistor hiding harvest completion from the board
- A hot gas valve not opening
- An expansion valve leaking by
- Low charge or a weak compressor
- An abnormally cold room stretching harvests
Can you fix it yourself?
The room check and one RESET with an observed harvest. Like its freeze-cycle sibling, E2's causes are internal once the environment is ruled out.
Step by step — what to try, in order:
- Check the room isn't abnormally cold
- Press the RESET button and watch whether harvest completes
When do you need a technician — and why?
Thermistor and hot gas valve testing is instrument work at the board and in the refrigeration circuit — the components that make harvests happen can't be assessed from outside the panel.
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 E2 mean on a Hoshizaki IM-series square cuber (IM-500SAA and similar)?
Harvest cycle backup timer. The harvest backup timer expired before the harvest termination temperature was reached, so the unit stopped. Listed causes: open thermistor, hot gas valve not opening, expansion valve leaking by, low charge, or an inefficient compressor. E2 shows directly on the display.
Can I fix E2 on a Hoshizaki IM-series square cuber (IM-500SAA and similar) myself?
The room check and one RESET with an observed harvest. Like its freeze-cycle sibling, E2's causes are internal once the environment is ruled out.
When does E2 on a Hoshizaki IM-series square cuber (IM-500SAA and similar) need a technician?
Thermistor and hot gas valve testing is instrument work at the board and in the refrigeration circuit — the components that make harvests happen can't be assessed from outside the panel. A recurring E2 requires professional testing of the thermistor and hot gas valve.