Garbage disposal will not turn on from the air switch (countertop pneumatic button), but works when wired directly.

Safety first: Disconnect power before working on the air switch module.

• Check air tube: Inspect the clear or opaque rubber tube between the countertop button and the air switch module. Ensure it is firmly connected at both ends and not kinked or split.
• Test the button: Press the button and listen near the module for a faint click. No click suggests the pneumatic signal is not reaching the switch.
• Clear air port: Remove the button and ensure the air port is not blocked by debris or sealant. Clean gently.
• Bypass test (qualified persons only): With power off, temporarily bypass the air switch by wiring the disposal to a standard switched outlet to confirm the disposal itself works.
• Replace faulty module: If the disposal runs when bypassed, replace the Rangemaster-compatible air switch kit (button, tube, and module) and re-test.