Meiko Dishwasher Error Code 127: Temperature Increase Not Reached

What does MEIKO error code 127 mean?

On Meiko M-iClean U undercounter dishwashers, message 127 means the temperature increase was not reached. The control expects the heating to raise the water temperature by a set amount during the program and checks it against the sensors. When the rise is short, the message appears. The operator step is to see if it reoccurs, and a service technician should be called if it does. The cycle itself may still finish, so the message is easy to overlook, but watch dish results while it is up. The manual lists the heating element and its relay, the temperature sensors, cold incoming water, and scale on the heating parts. Unlike 103, which reports a tank that never reached its target temperature, 127 is about how much the heating raised the water in the program. The display text is 127. A technician measures the water temperature and the heater before replacing a part.

Affected models and control systems

Meiko M-iClean U undercounter dishwashers (red and gray messages), per the operating instructions 9763258, section 9.4.1 Messages. Other Meiko models use different message numbers.

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

• Message 127
• Cycle completes but dishes less clean
• Water not as hot as usual
• Slow warm-up before the first load

Possible causes

Listed in MEIKO's documentation

• Heating element and its relay
• Temperature sensors
• Cold incoming water
• Scale on the heating parts

Other likely causes — what usually sits behind error code 127 on this control. A technician confirms which one it is before any part is replaced.

• An element that has lost part of its output so each rise falls short
• A sensor that reads high and ends the heating early
• A cold-water line from an unheated storeroom that lowers the starting point

Safe checks before calling for service

How a technician diagnoses error code 127

1. Read the message and note how often it repeats.
2. Measure incoming and tank temperature against the display.
3. Test the heating element and relay with a meter.
4. Check the temperature sensors against a thermometer.
5. Inspect and descale the heating parts if scale is found.

How error code 127 differs from similar codes

Message 127 reports the rise in temperature during the program, while 103 reports that the tank temperature was not reached.

Technical reference

Document

M-iClean U Original operating instructions 9763258 (update 2026-06), 9.4.1 Messages p.43-45

Edition

9763258 / Valid from: 2018-09 / Update: 2026-06

Models / control

M-iClean U (red/gray messages)

Section

9.4.1 Messages, printed pp. 43-45 of 70 (PDF pp. 43-45)

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.