Symptoms
- Pressing the air switch button does nothing
- Disposal only works if you access the switch under the sink directly
- Button feels loose or doesn't click
- Started after cabinet cleaning or plumbing work
Likely causes
- CommonDisconnected or pinched air tube under the sinkThe thin tube from the button to the switch unit can pop off or get pinched when items are moved under the sink.
- CommonWorn or failed air switch buttonThe button's internal diaphragm wears out over years of use.
- PossibleFailed pressure switch unit under the sinkThe switch that converts the air pulse to an electrical signal can fail.
- Less commonLoose wiring at the switch unitConnections can loosen from vibration.
What to do
- Look under the sink for the air switch control box, usually mounted to the cabinet wall.
- Check that the plastic air tube running from the counter button to the control box is fully connected and not kinked or pinched.
- Reconnect or reroute the tube if it's loose, pinched between items, or disconnected.
- Press the button again after fixing the tube and listen for the disposal to engage.
- If the tube is fine, the button or the control box itself may need replacing as a pair.
- Air switch kits are designed to be swapped without rewiring the disposal itself.
Tools and parts
- Flashlight
- Screwdriver
Air switch kit for garbage disposalSearch: “garbage disposal air switch kit replacement”
When to call a pro
If the tube and button both check out but the disposal still won't engage, have an electrician or plumber check the control box wiring.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.