Dexter Dryer Error Code COMM ERROR2: No Dryer Model Selected
COMM ERROR2 means the model selection jumper combination on the control board does not match any dryer model. The manual says to check the connector marked Jumpers on the control board. This usually follows a board replacement or a disturbed jumper.
Medium: the dryer will not run without a valid model selection, but the fix is a configuration check.
What does Dexter COMM ERROR2 mean?
A Dexter dryer control board is used on several dryer models, and the board learns which one it is in by a combination of pins that are jumpered on a model selection header. When the board starts, it reads that combination. If the pins are set in a way that does not have a model assigned to it, the board shows COMM ERROR2, with the message “COMM ERROR2 (No Dryer Model selected)”.
The manual explains it exactly that way: it occurs when a pin combination on the model selection header is used that does not have a model designated for it. The remedy is to check the connector marked Jumpers on the control board. Nothing in the document suggests that the board itself is bad. More often, this happens when the board is new, when a jumper has come loose or been moved, or when the board was taken from another dryer. A wrong or missing jumper is a configuration problem, and putting it right is a technician task.
Affected models and control systems
Dexter coin-operated dryers with the electronic control. The document prints no model list, and it does not state which dryer sizes the table covers.
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
- COMM ERROR2 on the display
- The dryer will not start
- The message returns every time power is applied
Possible causes
Likely causes — what usually sits behind COMM ERROR2 on this control. A technician confirms which one it is before any part is replaced.
- Model selection pins on the header set to a combination that has no dryer model assigned
- Jumper left off or moved when a board was replaced
- Jumper connector loosened by vibration
- Board from a different dryer model fitted without setting its jumpers
Safe checks before calling for service
- Note COMM ERROR2 and whether the control board was replaced or serviced recently.
- Switch the dryer off and on once to see whether the message remains.
- Do not open the panel or move any jumpers yourself.
- Tell the technician the dryer model and what service was done last.
How a technician diagnoses COMM ERROR2
- Confirm that the code appears at every power-up.
- With power off, locate the connector marked Jumpers on the control board.
- Compare the jumper positions with the model table for this dryer.
- Reseat or correct the jumpers.
- Power up and confirm that the message is gone.
- The jumpers are on the board inside the control cabinet with live parts.
- Setting them correctly needs the model table for the dryer.
- A wrong jumper can make the dryer run with the wrong settings.
How COMM ERROR2 differs from similar codes
Unlike COMM ERROR1, which concerns the communication bus, COMM ERROR2 points at configuration: the jumpers that tell the board which dryer it is in.
Technical reference
- Document
- Dexter Safety Guidelines / Common Dryer Troubleshooting Issues & Solutions / Troubleshooting Dryer Fault Errors/Codes (first-page headings; no separate cover title)
- Maker documentation
- Dexter owner support
- Models / control
- Dexter coin dryers with the electronic control; no model list printed (the T-30 to T-120 range is not stated in the document text)
- Section
- Dryer Error Codes table (Symptom / Probable Cause / Suggested Remedy), p. 6
- 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.
Related Dexter dryer error codes
Is the control board broken?
Not by the manual's description. It points to the jumpers on the model selection header.
Can I set the jumpers myself?
No. They have to match the dryer model, and the board is inside live equipment.
Why did it start after a repair?
A new or moved board can arrive with jumpers set for a different model or none at all.
Need help with Dexter COMM ERROR2?
A technician confirms the cause on site and gives you the price in writing before any work starts.