Dexter Dryer Error Code F3: PCB ERROR1, Memory Corrupted
F3 means the dryer's control board reports corrupted memory. The manual says to power the machine down and try to reset the control, verify voltage and ground at the board, and replace the board if the error cannot be cleared. One power-down is a safe operator step.
Medium: the dryer will not run while the board reports corrupted memory, but a reset may clear it.
What does Dexter error code F3 mean?
The electronic control board in a Dexter dryer stores its settings in memory. The board checks that memory when it starts up. If what it finds is damaged or does not make sense, it stops and shows F3, with the message “PCB ERROR1 (Memory corrupted)”.
The manual's table gives a three-part remedy. First, power the machine down and try to reset the control. Second, verify the voltage to the control board and check the ground to the board. Third, replace the control board if the error cannot be cleared. The order matters, because a brief supply problem or poor ground can scramble memory and clear after a restart. A board whose memory is truly bad will keep showing the error, and the manual then points to replacing it. The document lists no other causes and no timing for the restart.
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
- F3 and the PCB ERROR1 message on the display
- The dryer does not start a cycle
- The message may clear after a restart and then come back
Possible causes
Likely causes — what usually sits behind error code F3 on this control. A technician confirms which one it is before any part is replaced.
- Control board memory corrupted
- A power surge or brownout that corrupted memory
- Poor ground connection that lets electrical noise reach the board
- Control board memory failing with age
Safe checks before calling for service
- Switch the dryer off at its breaker or power switch, wait about a minute, and switch it back on, as the manual says to reset the control.
- See whether F3 returns on the display.
- Do not open the control panel or touch the board.
- Tell the technician about recent storms, outages or electrical work.
How a technician diagnoses error code F3
- Read the code and repeat the power-down reset.
- Measure the supply voltage to the control board.
- Check the ground connection from the board and the cabinet to earth.
- Inspect the board connections for looseness or burn marks.
- Replace the control board only if the error will not clear.
- Voltage and ground checks at the board are done with live testing inside the cabinet.
- A grounding problem can originate in the building's wiring and needs a qualified person.
- Replacing a control board means setting the dryer's model selection correctly.
How error code F3 differs from similar codes
F3 reports corrupted memory. PCB ERROR2 reports an analog/digital problem and the COMM errors report the communication bus or model selection.
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
Will restarting fix F3?
It may, since the manual starts with a reset. If the message stays, the board may need replacing.
Is my dryer ruined?
Not necessarily. The manual lists a reset and electrical checks before a replacement.
Can a power surge cause this?
The manual does not say, but checking voltage and ground at the board is part of its remedy.
Need help with Dexter error code F3?
A technician confirms the cause on site and gives you the price in writing before any work starts.