MEIKO Commercial Dishwasher Error Code ERR 118: Door Switches Disagree
ERR 118 on the UPster U 400 M2 display reads Signal of the two door contact switches unequal, meaning the two door switches disagree about the door state. The manual gives a malfunctioning or defective door contact switch as the cause and says to call a service technician.
High: the machine stops and will not run until the door switch problem is repaired.
- Code
- ERR 118
- Maker
- MEIKO
- Equipment
- Dish machines
- Applies to
- Meiko UPster U 400 M2 glass and dishwasher, M001DWUC10M2-10
What does MEIKO error code ERR 118 mean?
The UPster U 400 M2 uses two door contact switches so that the control can be sure the door is really closed before the machine runs. Normally both switches change state together. If they report different states, the control cannot trust either one and shows ERR 118, Signal of the two door contact switches unequal. The manual gives the cause as a malfunction or defective door contact switch and says it is not possible to continue working. It does not say which of the two switches is wrong, nor whether a misaligned door could cause the same disagreement, so that is a likely cause only. The disagreement matters because the door switches are part of the safety function that stops the machine when the door opens. The display reads Signal of the two door contact switches unequal with ERR 118.
Affected models and control systems
This code is listed for the Meiko UPster U 400 M2 glass and dishwasher, type M001DWUC10M2-10, in section 9.6.1 Messages (the ERR table on printed pp. 34-35).
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
- ERR 118 with the text Signal of the two door contact switches unequal
- Machine will not start or stops at the door check
- Door appears closed but the machine acts as if it is open
Possible causes
Likely causes — what usually sits behind error code ERR 118 on this control. A technician confirms which one it is before any part is replaced.
- Malfunction or defective door contact switch
- Door slightly out of line, so one switch makes contact and the other does not
- Actuator or magnet for one switch loose or damaged
- Wiring or connector to one switch loose or corroded
Safe checks before calling for service
- Open the door fully, then close it firmly and check that it latches evenly.
- Look for anything caught in the door edge or seal that prevents it sitting flat.
- Do not force or tape the door to defeat the switches.
- Note whether the message returns on every closing, only sometimes, or only after a hard shut, for the service call.
How a technician diagnoses error code ERR 118
- Read the message history and note how often ERR 118 appears.
- Check both door switches and their actuators for alignment and play.
- Measure the signal from each switch as the door opens and closes to see which one lags or sticks.
- Inspect the wiring and connectors to both switches.
- Replace the failed switch, adjust the door, and run a test cycle.
- The door switches are a safety function, so defeating or adjusting them without the maker's specification is unsafe.
- Measuring switch signals means working at live wiring in a machine with water present.
- Telling which of two switches is bad takes a meter and the machine's wiring information.
Technical reference
- Document
- UPster U 400 M2 Glass- and dishwasher - Original operating instructions (type M001DWUC10M2-10)
- Edition
- 9760441 / Valid from: 2018-02 / Update: 2026-06
- Models / control
- Meiko UPster U 400 M2 glass and dishwasher, M001DWUC10M2-10
- Section
- 9.6.1 Messages: INFO table printed p. 33, ERR table pp. 34-35 (of 50)
- 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 MEIKO dish machine error codes
Can I keep working with ERR 118?
No. The manual says it is not possible to continue working, and to call a service technician.
Can I bypass one door switch?
No. The two switches exist for safety, and bypassing either one is unsafe.
Does a hard door slam fix it?
It may seat the door briefly, but if the message returns, a switch or actuator is probably worn or misaligned.
Need help with MEIKO error code ERR 118?
A technician confirms the cause on site and gives you the price in writing before any work starts.