Newco Coffee Brewer Error Code E9: Display Board Communication Error
E9 means the brewer found a serial communication error between the display board and the main board. Input from the display board is disabled. The manual says to verify a good connection in the proper port and to check the display board and main board.
Medium: the keys are disabled so the brewer is hard to operate, but heating is not mentioned.
- Code
- E9
- Maker
- Newco
- Equipment
- Coffee brewers
- Applies to
- Newco 20:1-LD, 20:1-AP, 20:1-TD, 20:1-LP3, 20:1-AP Pro, thermal models
What does Newco error code E9 mean?
The brewer has a display board with the keys and screen, and a main board that runs the heating, valves and pumps. They exchange information over a serial link. If that link fails, the control shows E9 (SPI Comm Error) and disables input from the display board, which means the buttons you press are ignored. The manual lists the cause as a serial communication error to or from the display board. Its actions are to verify a good connection in the proper port, then to check the display board and main board and replace the failing board. A loose cable is the simplest explanation, which is why the connection check comes first. If the cable is good, one of the two boards has failed.
Affected models and control systems
Newco 20:1-LD, 20:1-AP, 20:1-TD, 20:1-LP3, 20:1-AP Pro and thermal models.
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
- E9 (SPI Comm Error) on the display
- Buttons or keys not responding
- Display blank, dim or scrambled
- Brewer unable to start a brew from the display
Possible causes
Listed in Newco's documentation
- Serial communication error to/from display board
Other likely causes — what usually sits behind error code E9 on this control. A technician confirms which one it is before any part is replaced.
- Display cable loose or not in the proper port
- Cable damaged where it bends
- Display board failed
- Main board communication circuit failed
Safe checks before calling for service
- Switch the brewer off and unplug it for one minute.
- Plug in and switch on, then check whether the keys respond.
- Check for spilled liquid near the display.
- If E9 returns, call for service and do not open the cabinet.
- Tell the technician whether the keys responded at all and whether anything was spilled.
How a technician diagnoses error code E9
- Read the display and confirm E9.
- Check the cable between the display board and main board and verify it is in the proper port.
- Inspect the cable and plugs for damage.
- Test with a known good display board or main board.
- Replace the board that fails and confirm key input.
- The boards are in a cabinet with live line-voltage wiring.
- Swapping boards for testing must be done with power off and needs the right parts.
- The manual says to check both boards, which needs a technician's test equipment.
How error code E9 differs from similar codes
E5 is a communication error with the memory chip. E9 concerns the link to the display board.
Technical reference
- Document
- 20:1 Coffee/Tea Brewer Operation and Service Manual
- Edition
- Man PN 121751 Rev 20260710
- Models / control
- Newco 20:1-LD, 20:1-AP, 20:1-TD, 20:1-LP3, 20:1-AP Pro, thermal models
- Section
- Error Messages, 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 Newco coffee brewer error codes
Why do the buttons not work with E9?
The manual says input from the display board is disabled while E9 is active.
Can a loose cable cause E9?
Yes. The manual says to verify a good connection in the proper port.
Is E9 the same as E5?
No. E5 is a memory communication error. E9 is a display board communication error.
Need help with Newco error code E9?
A technician confirms the cause on site and gives you the price in writing before any work starts.