Alto-Shaam CT Express Combi Error Code E107: Boiler Drain Pump
E107 Boiler Drain Pump Fault means the boiler drain pump is not running. A technician checks power to the pump motor, the pump itself, its connections and the Hall effect sensor wiring.
Medium: the boiler may not drain, which can affect cleaning and steam.
- Code
- E107
- Maker
- Alto-Shaam
- Equipment
- Combi ovens
- Applies to
- CT Express 4-10ESi, 4-10ESiVH, 4-10CCi, CTX4-10E, CTX4-10EC, CTX4-10EVH
What does Alto-Shaam error code E107 mean?
The CT Express empties its steam boiler with a drain pump, and a Hall effect sensor confirms the pump is turning. If the drain pump is not running, the control posts E107 Boiler Drain Pump Fault. The manual lists four causes: the drain pump motor is not energized, the drain pump has failed, there is a poor connection at the pump or relay board, or the Hall effect sensor wiring has a problem. The actions are to check pump motor power, the pump, connections and Hall effect sensor wiring. A boiler that cannot drain keeps its water and its scale, which can affect later cooking and descaling. In hard-water areas, scale in the pump is one more reason a pump may stall. This number is specific to the CT Express controller. On the CT PROformance and Classic, the matching condition is E34, the steam generator drain pump message, which is raised by a timed drain test.
Affected models and control systems
CT Express combis 4-10ESi, 4-10ESiVH, 4-10CCi, CTX4-10E, CTX4-10EC and CTX4-10EVH with a boiler drain pump.
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
- E107 Boiler Drain Pump Fault on the display
- Boiler not emptying
- Water left in the boiler after a program
Possible causes
Listed in Alto-Shaam's documentation
- Drain pump motor not energized
- Drain pump failed
- Poor connection at the pump or relay board
- Hall effect sensor wiring problem
Other likely causes — what usually sits behind error code E107 on this control. A technician confirms which one it is before any part is replaced.
- Scale packed in the pump housing from untreated water
- A drain line blocked downstream so the pump labors
Safe checks before calling for service
- Turn the oven off and on once.
- Check that the oven's floor drain is clear.
- Avoid starting a descale or cleaning program.
- Tell the technician when the boiler was last descaled.
How a technician diagnoses error code E107
- Read the code and confirm the oven model.
- Check power to the drain pump motor.
- Inspect the pump for scale or a jam.
- Check the connections at the pump and relay board.
- Check the Hall effect sensor wiring before replacing the pump.
- The pump motor and the boiler sit near hot water and line voltage.
- Descaling uses acids.
- Hall sensor tests need a meter.
How error code E107 differs from similar codes
E106 is the cleaning pump; E107 is the boiler drain pump. On CT PROformance and Classic ovens the drain pump message is E34.
Technical reference
- Document
- Combitherm CT Express Technical Manual (4-10ESi, 4-10ESiVH, 4-10CCi, CTX4-10E, CTX4-10EC, CTX4-10EVH)
- Maker documentation
- Alto-Shaam owner support
- Edition
- MN-36008 (Rev. 9) 03/16
- Models / control
- CT Express 4-10ESi, 4-10ESiVH, 4-10CCi, CTX4-10E, CTX4-10EC, CTX4-10EVH
- Section
- Section C, Error Codes, pp. C-3 to C-8
- 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 Alto-Shaam combi oven error codes
Is E107 caused by scale?
It can be, though the manual lists the pump and wiring causes.
Is it the same as E34?
They concern the drain pump, but on different controllers.
Can I keep cooking?
The manual does not say; avoid steam until it is checked.
Need help with Alto-Shaam error code E107?
A technician confirms the cause on site and gives you the price in writing before any work starts.