Frymaster M3000 Fryer Error Code E10: Drain Valve Not Open
ERROR DRAIN VALVE NOT OPEN (E10) on a Frymaster Gen II LOV fryer with the M3000 computer means the drain valve failed to open and its position is unknown. The manual says to call service. Do not try to force the valve.
Medium: the drain and filter functions cannot be relied on, but the fryer can still cook.
What does Frymaster error drain valve not open mean?
The M3000 computer commands the drain valve open when oil needs to flow to the filter pan, and it expects a signal that the valve actually moved. If the valve fails to open and its position cannot be confirmed, the computer logs E10 and shows ERROR DRAIN VALVE NOT OPEN. The manual's instruction is to call service. Because the computer no longer knows where the valve is, it cannot safely continue a filter run: oil that is meant to drain may not, or the pump may run against a closed path. For an operator, the point is that a filter cycle, a boil-out or a drain to waste is not working as expected. Do not attempt to force the valve, since hot oil is behind it. The code belongs to the Gen II LOV M3000 table and is not found on the 3000/3010 controller.
Affected models and control systems
Gen II LOV fryers with the M3000 computer, BIELA14 series electric; the BIGLA30 gas fryer uses the same computer family.
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
- ERROR DRAIN VALVE NOT OPEN on the computer
- Vat that does not drain during filtering
- Pump noise with no oil movement
- Filtering that stops partway
Possible causes
Likely causes — what usually sits behind error drain valve not open on this control. A technician confirms which one it is before any part is replaced.
- Hardened shortening or debris blocking the drain valve ball
- A drain valve actuator that has lost power or jams
- A position sensing switch that does not report the open position
Safe checks before calling for service
- Do not force the drain valve or open it by hand while oil is hot.
- Let the oil cool before anyone checks the area.
- Leave the fryer off if it cannot filter, and cook with oil changes planned.
- Write down the vat, the action in progress and the message, and call service.
How a technician diagnoses error drain valve not open
- Read the error log for E10 and any related valve codes.
- Verify the actuator receives its command and moves.
- Check the valve for blockage and the linkage for binding.
- Test the position sensing so the computer sees open and closed.
- Replace the actuator, switch or valve only after a test shows which.
- The drain valve sits under hot oil and is not safe for an operator to free.
- Actuator and sensing checks involve live wiring in the cabinet.
- The computer's service menus are needed to command the valve during tests.
How error drain valve not open differs from similar codes
E10 is the drain valve failing to open and E11 is it failing to close; both leave the valve position unknown.
Technical reference
- Maker documentation
- Frymaster owner support
- Edition
- May 2011, 819-6446
- Models / control
- 3000 controller / M3000
- Section
- 1.14.4 Error Log Codes, p. 1-35
- 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 Frymaster fryer error codes
Can I still fry?
The fryer may heat, but filtering and draining are not working properly. Plan on service soon.
Is E10 the same as E11?
No. E10 means the drain valve failed to open and E11 means it failed to close.
Will the code clear by itself?
Not if the valve or its sensing is the problem. It needs a check.
Need help with Frymaster error drain valve not open?
A technician confirms the cause on site and gives you the price in writing before any work starts.