Miele Dishwasher G1040 - Continuous Intake
It is staying on its wash cycle (used up a cylinderful of hot water!), and the Start/Stop button has stopped working. (That is, when the power button is pressed, it goes straight into washing.) I have had the top panel off and the Start/Stop microswitch seems to operate okay. Now I am wondering if it is a failure in a timer or programming unit, or if it could be something to do with a sensor.
It is an old machine, second-hand, but has worked superbly until now. I would be grateful for any advice on how to pinpoint the fault.
The entire motherboard.looks easily replaceable so I wonder if they are available anywhere and not too costly.
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Miele G1040 dishwasher stays in wash cycle and Start/Stop does not respond
- The problem
- The Miele G1040 reportedly goes straight into washing when powered on, the Start/Stop button does not stop or reset it, and the machine remains on its wash cycle for an extended time, apparently using a large amount of hot water.
- Likely cause
- The strongest diagnosis in the discussion is that the dishwasher is not recognising a stage change or reset command. Suggested causes were a fault in the water level sensing system such as the pressure chamber, pressure switch or air tube, a wiring or continuity fault at the Start/Stop switch, or less likely a control board/programming unit fault. The exact cause was not confirmed.
- What fixed it
- Recommended checks were to confirm whether it was truly continuously filling or instead continuously circulating/heating, inspect the pressure chamber, pressure switch and small air tube for blockage, check the anti-flood base tray and float switch for water, and test continuity of the Start/Stop microswitch and its wiring/connectors to the control board. If these checks did not reveal a fault, the control board or timer/programming unit was considered more likely. No completed repair was confirmed in the thread.
- Checks to try
- Confirmed whether the machine was continuously filling or continuously circulating/heating
- Inspected pressure chamber
- Inspected pressure switch
- Inspected small air tube connected to the pressure switch
- Checked anti-flood base tray for water
- Checked float switch underneath
- Checked electrical continuity of the Start/Stop microswitch
- Inspected wiring loom/connectors back to the control board
- Parts or tools mentioned
- Start/Stop microswitch
- Pressure chamber
- Pressure switch
- Air tube
- Float switch
- Control board/programming unit
Safety: Isolate it from the mains before removing panels or touching wiring. Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
It does sound more like the machine is not recognising a stage change or reset command, rather than a simple button fault. On an older Miele, that could be a control board issue, but there are a few worthwhile checks first.
1. Isolate it from the mains before removing panels or touching wiring. If you are not confident with live electrical testing, leave that to an engineer.
2. Check whether it is actually continuously filling, or just continuously circulating/heating. If it genuinely keeps taking in water, suspect the inlet valve sticking open or the water level/pressure sensing system not telling the control it has filled.
3. Inspect the pressure chamber, pressure switch and any small air tube connected to it. If these get greasy or blocked, the dishwasher can “lose track” of the water level and stay in the wrong part of the cycle.
4. Check the anti-flood base tray for water and the float switch underneath. On some machines, water in the base can confuse operation and cause odd behaviour.
5. Since the Start/Stop microswitch seems mechanically sound, check its electrical continuity and also inspect the wiring loom/connectors back to the control board. A bad connection can mimic a failed switch.
6. If all of the above are sound, then the timer/programming unit or main control board becomes more likely. On a machine of this age, used boards may turn up via appliance breakers or auction sites, but new genuine Miele electronics are often expensive.
If you can confirm whether it is overfilling, heating constantly, or simply never advancing, that would narrow it down a lot. For mains testing or control board diagnosis, I’d recommend a qualified appliance engineer.
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This answer was generated automatically by the WhitegoodsHelp AI Assistant. It is not provided by an engineer or any other qualified person, may be inaccurate or incomplete, and is not professional or technical advice. Do not rely on it. Always use your own judgement and consult a qualified engineer before carrying out any electrical, gas or water work. Use is entirely at your own risk. See our full Terms of Use.
SAFETY FIRST: READ BEFORE ACTING ON THIS GUIDANCE
Never work on a live appliance
Always unplug it at the mains before going near it with any tools.
Never attempt gas work
By law, gas appliances must only be worked on by a Gas Safe registered engineer. If your fault involves gas, stop and call a professional. Do not attempt it yourself.
Watch for sharp edges
Outer panels are smooth, but internal parts have sharp machined edges. Wear protective gloves and arm sleeves.
Water appliances can leak
Turn off the water supply before disconnecting any hoses.
Know your limits
If you are not confident testing or working inside the appliance, stop and call a professional.
AI guidance, not guaranteed
This response is generated automatically by the WhitegoodsHelp AI Assistant. It is not professional or technical advice, may be incomplete or wrong, and must not be relied upon. Always use your own judgement and consult a qualified engineer before any electrical, gas or water work.
This is general information only and is not professional advice. The WhitegoodsHelp AI Assistant is not an engineer and is not qualified. See our full Terms of Use.
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