The short answer
A panel where some keys work and others never respond is a failing membrane keypad, which is the leading control fault on mounted units. A panel that responds to everything but will not start is usually a lock mode or a door that is not being seen as closed.
What the panel is doing
- One row or column of keys does nothing — The signature of a membrane failure rather than a board failure.
- A key responds only when pressed hard or repeatedly — The same fault, earlier in its life.
- Display lit, a lock legend showing, nothing starts — A lock mode is active and is doing its job.
- The unit beeps at the start key and cancels — Very often the door is not being registered as closed.
- Display segments missing or dim — Display driver or the board behind it.
- Not this fault: everything is dark and dead — That belongs on the will-not-start page, not here.
Ranked for a mounted unit
- Membrane keypad degraded by heat and steam from the range below — First, and specific to this install. Zones of dead keys, worsening over months.
- Child lock or demo mode active — Second: free to clear, and it mimics a total control failure.
- Door not registering as closed — Third. The control refuses to run and the owner blames the keypad.
- Control board or its display driver failing — Fourth, and it usually shows as missing segments rather than dead keys.
- Supply problem showing as an erratic display — Fifth, typically after a breaker event or on a shared circuit.
- Ribbon connection between keypad and board unseated — Last, and only reachable behind the case, which is not owner territory.
The order to work in
- Press every key in turn and map which ones respond — A map of dead zones is the diagnosis; a general impression is not.
- Clear any lock or demo mode from the panel legend — Instant, free and frequently the whole answer.
- Open and firmly close the door, then retry the start key — Separates a door-sensing refusal from a control one.
- Cycle the breaker once and re-map the keys — Distinguishes a latched state from a physical keypad failure.
Owner checks
- Work along the whole keypad and note every key that fails — Dead keys in a line point at the membrane; scattered failures rarely do.
About 10 min
- Hold the lock key for the period printed beside it — Clears the most common false failure on this panel.
About 5 min
- Close the door firmly and listen for the latch to seat — A door resting shut but not latched stops every start command.
About 5 min
- Switch the breaker off, wait a minute, switch it back on — One clean reset is worth doing; repeated cycling is not.
About 10 min
- Clean the panel face with a damp cloth, not a spray — Sprays drive moisture into the membrane edges and make this fault worse.
Tools: clothAbout 10 min
- Stop before the case or the control housing is opened — A capacitor sits behind that case and can hold a lethal charge.
The boundary on this appliance
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off; in a microwave that charge is lethal and the case therefore stays on. Never spray cleaner directly at a control panel, and do not run the unit with the door held or wedged: the latch system is what tells the control it is safe to energise.
When to call
Call when a mapped zone of keys is dead, when display segments are missing, or when the unit refuses to start with a properly latched door and no lock set. Those all live behind the case. Call immediately, and stop using the appliance, if the panel behaves erratically together with any burning smell or visible scorching around the door frame.
Other faults on this appliance
What is not on this page
Written for mounted units across families rather than for one model line; the companion control page below takes the same symptom on a counter-standing unit. A family-specific or model-specific page, where one exists, is the narrower answer. Not here: lock key combinations by panel generation, the meaning of individual display indications, keypad part numbers and board connector maps.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
