What does EE (log code Ed) mean on a Hoshizaki IM-series square cuber?
Short answer: Water regulating valve error. If your Hoshizaki IM-series square cuber (water-cooled models with water regulating valve) is showing EE (log code Ed), 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 water regulating valve thermistor detected a temperature below the error-detection setting — cooling water isn't being regulated properly. The error is displayed but the unit continues to operate. (Not applicable on IM-500SAA, which has no water regulating valve.)
Which machines show this?
this fault applies only to water-cooled IM-series square cubers — machines that reject heat into a building water loop through a water regulating valve instead of blowing it into the room with a fan. Water-cooled ice machines are the minority, chosen for hot or tight equipment rooms. This particular error is unusual among ice machine faults in that the machine keeps running while displaying it, which makes it easy to ignore — note it and have the regulating valve checked at the next service visit rather than letting it ride indefinitely.
What causes it?
- The water regulating valve thermistor reading below its error threshold — cooling water not being regulated properly
- A drifting or failed valve on the building water loop
Can you fix it yourself?
The RESET and the note — unusually, the machine keeps running with this error displayed. Log it and keep making ice.
Step by step — what to try, in order:
- Press the RESET button
- Note the error for your service company — the machine keeps running
When do you need a technician — and why?
Water-cooled refrigeration balance is set by that regulating valve; having it checked at the next scheduled visit (rather than ignored indefinitely) keeps a running-with-error machine from becoming a stopped 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 EE (log code Ed) mean on a Hoshizaki IM-series square cuber (water-cooled models with water regulating valve)?
Water regulating valve error. The water regulating valve thermistor detected a temperature below the error-detection setting — cooling water isn't being regulated properly. The error is displayed but the unit continues to operate. (Not applicable on IM-500SAA, which has no water regulating valve.)
Can I fix EE (log code Ed) on a Hoshizaki IM-series square cuber (water-cooled models with water regulating valve) myself?
The RESET and the note — unusually, the machine keeps running with this error displayed. Log it and keep making ice.
When does EE (log code Ed) on a Hoshizaki IM-series square cuber (water-cooled models with water regulating valve) need a technician?
Water-cooled refrigeration balance is set by that regulating valve; having it checked at the next scheduled visit (rather than ignored indefinitely) keeps a running-with-error machine from becoming a stopped one. Have the water regulating valve checked at the next service visit.