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Error code · True · Reach-in refrigerators

True Refrigerator Error Code EoC / non / SYn: Danfoss ERC Display Problems

EoC, non and SYn are display messages on a True cabinet with a Danfoss ERC control. They point to the link or setup between control and display, not to a cooling problem. Note which message shows, use a thermometer instead of the display, and call us.

Medium · inspection needed

Medium: the cabinet may keep cooling, but the display cannot be trusted for temperature.

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Code
EoC / non / SYn
Maker
True
Equipment
Reach-in refrigerators
Applies to
Danfoss ERC

What does True error code EoC / non / SYn mean?

EoC is a communication error between the control and its display. The message non means the display sensor is not set up correctly, and SYn means the connected display does not suit the control. The control checks that its display is present and matches before it shows readings, so these messages appear when the display is replaced, the cable is loose, or the setup does not agree. They point to the link or the setup, not to a cooling problem, so the cabinet may keep working while the display shows odd numbers or goes blank. That also means the display cannot be trusted while a message is active, and food temperature should be judged with a separate thermometer. A technician checks the cable first, then the display match, then the setting for the display sensor.

Affected models and control systems

True cabinets with a Danfoss ERC control and its display.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

  • EoC, non or SYn on the display
  • Odd numbers or a blank display
  • Cooling that continues normally
  • Readings that disagree with a thermometer

Possible causes

Listed in True's documentation

  • The cable between the control and the display
  • A display that does not match the control after a replacement
  • Control settings for the display sensor
  • The display or control board

Other likely causes — what usually sits behind error code EoC / non / SYn on this control. A technician confirms which one it is before any part is replaced.

  • A display cable pinched behind the front panel after cleaning
  • A display from a different cabinet fitted during an earlier repair
  • A setting changed on the control that no longer matches the sensor fitted

Safe checks before calling for service

✓ What an operator can do
  1. Note which of the three messages shows.
  2. Check the cabinet temperature with a thermometer instead of the display.
  3. Make sure the display cable is not pinched, but do not open panels.
  4. Avoid pressing keys to change settings.
  5. Call us with the message and a photo of the display.

How a technician diagnoses error code EoC / non / SYn

  1. Read which message is active.
  2. Check the cabinet temperature on an independent thermometer.
  3. Inspect the display cable and connectors.
  4. Compare the display part number with the control.
  5. Check the display sensor setting on the ERC.
  6. Replace the display or control after isolating the failing unit.
! Leave this to a technician
  • Reseating the display cable means opening panels near live circuits.
  • Matching the display to the control needs part numbers and parameter data.
  • Setting changes on the ERC can disturb cooling if entered wrongly.

Technical reference

Document
Commercial Refrigeration General Control Guide TEC_TM_001 Rev C, Danfoss ERC Display Code Definitions
Edition
TEC_TM_001 | REV. C | EN, 09/3/2025, P#811072
Models / control
Danfoss ERC
Section
Electronic Control (with Display) - Display Code Definitions: Carel p. 74, Danfoss ERC/ETC p. 87, Dixell p. 96, LAE p. 110
Checked
October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.

→Same maker

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EoC / non / SYnQuestions about True error code EoC / non / SYn
Does EoC mean the cabinet stopped cooling?

No. It is a communication error with the display; cooling often continues.

What is the difference between non and SYn?

non says the display sensor is not set up correctly, while SYn says the display does not suit the control.

Can I fix it with the keypad?

No. Changing settings can make it worse, so call us.

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Need help with True error code EoC / non / SYn?

A technician confirms the cause on site and gives you the price in writing before any work starts.

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