Dishwasher Clicking Noise: Causes & When to Worry

Quick Answer

The most common clicking in a dishwasher is the control switching a relay or actuator (diverter, detergent door, or drain solenoid) on and off. It happens when the control is sequencing functions or when it can’t confirm movement and retries. First action: note exactly when the clicking occurs (start, fill, wash, heat, drain, end) and whether the machine still changes functions (fills, sprays, drains). That timing points to the specific relay/actuator.

Identify the Noise First

Relay and actuator clicks are event-based: they line up with a command (start, heat on, diverter change, drain on, dispenser release) rather than a constant mechanical grind. Use a phone timer and listen with the door closed, then again immediately after you pause/cancel to see if the clicking stops the moment the control stops commanding outputs.

During water fill: clicking right as filling starts or stops often matches an inlet relay or a float/level switch changing state and the control immediately re-commanding.
During spray / circulation: clicking every 10–60 seconds can be a diverter actuator being pulsed or hunting for position while the wash motor runs.
During draining: a single click at drain start is normal control output; rapid repeating clicks during drain usually indicates the control is retrying a drain output or reacting to a float/level signal that doesn’t match expected water loss.
During heating: a firm click when heat is enabled (often a few minutes into wash) points to the heater relay; repeated clicking suggests the relay is chattering due to unstable feedback or power/board issues.
At start of cycle: one to several clicks in the first 30 seconds can be self-check sequencing (latch sensing, diverter home, drain purge command). Continuous clicking from the first moment is not typical.
At end of cycle: one click as the machine powers down outputs is normal; repeated clicks with the unit “done” suggests the control is still attempting a function (often due to a stuck input like float or door/latch signal).
Constant: continuous rapid clicking usually indicates relay chatter (board/voltage/trace damage) rather than a single actuator event.
Intermittent: sporadic single clicks are commonly normal sequencing; intermittent clusters of clicks tied to the same moment in the cycle indicate a repeat attempt.

What This Noise Usually Means

A click is the sound of an electrical switch (relay/triac-driven relay) or a mechanical actuator being energized. The control board sends power to a load, and you hear the relay armature snap or an actuator/solenoid plunger move. In normal operation it’s one click per command. When the dishwasher clicks repeatedly, it usually means the control is energizing a device, not seeing the expected result (position change, water level change, temperature rise, or a stable input), and it cycles the output again.

Most Common Causes

Normal sequencing clicks from relays/actuators: single clicks at function changes (drain purge at start, dispenser release, diverter change, heater enable) are typical and brief.
Diverter actuator hunting: repeated clicks during wash as the control tries to shift spray zones but can’t confirm position, causing repeated energizing of the diverter circuit.
Relay chatter on the control board: rapid clicking (often multiple times per second) caused by a failing relay, cracked solder joint, or unstable supply to the board, leading to repeated make/break of the same output.
Sticking solenoid or actuator: a solenoid (commonly drain or dispenser-related depending on design) pulls in with a click but doesn’t hold or release properly, prompting the control to retry or resulting in multiple clicks.
Door latch or safety input instability: if the control intermittently “loses” a safety signal, it may drop outputs and re-energize them, producing a pattern of clicks tied to minor door movement or vibration.
Unexpected water level/float input changes: the control may stop and restart a commanded device when the float/level switch toggles unexpectedly, creating repeating clicks at the same stage.

How to Check Safely

These steps focus on identifying which relay/actuator is being commanded and whether it’s normal switching or a control/actuator fault.

1) Confirm cycle stage: start a normal cycle and listen for the first click. Note the minute/second and what the dishwasher does immediately after (begins filling, starts washing, changes spray sound, starts draining, or goes quiet).
2) Isolate load factor: remove any items that can press on the door, interfere with the detergent dispenser, or contact the rack/walls. A dispenser or latch that’s being mechanically loaded can cause repeated command attempts and clicking.
3) Inspect relevant components (no disassembly required): check that the detergent door closes freely and doesn’t bind. Check the door latch engages firmly and the door doesn’t flex open when you press gently near the latch. If the clicking happens during wash and sounds like it comes from the underside/center, suspect a diverter actuator circuit; if it’s from the control area, suspect relay chatter.
4) Confirm or rule out obstruction (functional, not internal): if clicking coincides with a spray pattern change, pause the cycle, wait 10 seconds, then resume. If it immediately clicks again and the spray sound never changes, that supports an actuator that can’t complete its move (binding or failed feedback).
5) Perform a controlled test: run a short/quick cycle with heated dry and extra options off. If clicking only appears when heat is selected or at the exact moment heat should energize, the heater relay circuit is implicated. If clicking persists regardless of options and is rapid, suspect control relay chatter or an unstable input (latch/float) causing repeated dropouts.

If you smell burning electronics, see flickering control lights, or the clicking is rapid and continuous, stop the cycle and turn power off at the breaker. Those symptoms align with control-board relay chatter or overheating components.

When This Is Normal vs A Problem

Normal: one click at the start (drain purge command), one click when filling stops, one click when wash starts, one click when the detergent door releases, and one click when draining starts. These are isolated events, and the dishwasher’s behavior changes right after the click.

Problem: repeated clicking in clusters where the dishwasher fails to change function (keeps trying to divert but spray sound never changes, keeps trying to heat but never warms, keeps trying to drain but water level doesn’t drop), rapid continuous clicking (relay chatter), or clicking that starts only after the unit warms up and then becomes more frequent (heat-related relay/board stress).

When to Call a Technician

Call if the clicking is rapid/continuous, the control panel flickers, or there is a hot electrical smell.
Call if clicking repeats at the same point in every cycle and the dishwasher stalls, won’t progress, or throws an error code.
Call if clicking is tied to heating enable and you’re not getting hot wash water or drying performance, since heater control circuits require electrical testing.
DIY stop point: once you’ve confirmed the stage and ruled out dispenser binding and door-latch looseness, further diagnosis typically requires live voltage checks and component access.

How to Prevent This Problem

Keep the door latch area clean and aligned: residue buildup and door flex can cause intermittent latch signal changes that lead to repeated output cycling.
Don’t overload the front of the racks: items pressing the inner door can prevent proper detergent door movement, leading to repeated command attempts on some designs.
Use correct detergent and avoid excessive suds: over-foaming can confuse level sensing and cause the control to repeatedly start/stop commanded loads.
Address moisture exposure quickly: if the unit has had a leak or heavy steam venting into the control area, dry it and correct the source; moisture accelerates relay/board failures and connector corrosion that can cause chatter.

Conclusion

Dishwasher clicking is usually the control board switching a relay or an actuator being energized. One click at a function change is normal; repeated clicking means the control is retrying or a relay is chattering. Your next step is to tie the click to an exact cycle stage and confirm whether the dishwasher’s function changes immediately after each click. If it doesn’t, focus on the related actuator circuit or control relay behavior.

Frequently Asked Questions

Why does my dishwasher click several times in a row and then pause?

That pattern usually means the control is issuing repeated attempts to move an actuator or energize a load, then timing out. The pause is the control waiting for a feedback change it didn’t get (position, level, or safety input), then trying again at the next programmed check.

Is one click when the dishwasher starts always normal?

Often, yes. Many units command a brief drain purge or run a quick actuator check at startup, which produces a single click. It becomes abnormal when the click repeats rapidly, the unit never transitions into fill/wash, or the click coincides with control lights flickering.

How can I tell if the clicking is the diverter actuator or the control board relay?

Diverter-related clicking tends to be intermittent during wash and often coincides with an attempted spray-zone change. Relay chatter from the control board is typically faster, more continuous, and may be accompanied by unstable operation (random stops/starts) or flickering indicators.

Why does the clicking happen only on heated cycles?

When heat is enabled, the control energizes the heater relay circuit. Clicking that appears only at heat-enable points suggests the heater relay is switching (normal once) or cycling because the control can’t maintain a stable command due to a failing relay/board or an input that’s interrupting the heat command.

Can a loose door latch cause clicking even if the dishwasher still runs?

Yes. A marginal latch switch can momentarily open from vibration. The control may drop an output and then re-energize it once the latch signal returns, creating intermittent clicking that often changes if you press on the door near the latch.

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