Alto-Shaam CT Express Combi Error Code E106: Cleaning Pump

What does Alto-Shaam error code E106 mean?

The CT Express circulates cleaner with a cleaning pump during its cleaning program. A Hall effect sensor on the pump tells the control that it is actually turning. If the pump is not running, the control posts E106 Cleaning Pump Fault. The manual lists four causes: the pump motor is not energized, the pump has failed, there is a poor connection at the pump or relay board, or the Hall effect sensor wiring has a problem. Its actions are to check pump motor power, the pump, connections and the Hall effect sensor wiring. The code appears only when the cleaning cycle calls for the pump, so ordinary cooking is not named as affected. This number is specific to the CT Express controller. A related message, E107, covers the boiler drain pump with the same four causes, so a technician reads both when the pumps are involved.

Affected models and control systems

CT Express ovens (4-10ESi, 4-10ESiVH, 4-10CCi, CTX4-10E, CTX4-10EC and CTX4-10EVH) that clean with a pump-driven program.

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

• E106 Cleaning Pump Fault on the display
• Cleaning program stopping
• No pump sound when cleaning starts

Possible causes

Listed in Alto-Shaam's documentation

• Cleaning pump motor not energized
• Cleaning pump failed
• Poor connection at the pump or relay board
• Hall effect sensor wiring problem

Other likely causes — what usually sits behind error code E106 on this control. A technician confirms which one it is before any part is replaced.

• Dried cleaner crystals jamming the pump after a cleaning run was cut short
• A tank with too little cleaning solution so the pump runs dry

Safe checks before calling for service

How a technician diagnoses error code E106

1. Read the code and confirm it appeared during cleaning.
2. Check power to the pump motor with a meter.
3. Inspect the pump for jamming or crystallized cleaner.
4. Check the connections at the pump and relay board.
5. Check the Hall effect sensor wiring before replacing the pump.

How error code E106 differs from similar codes

E107 is the boiler drain pump with the same four causes; E106 is the cleaning pump.

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.