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Kohler — Oil Sentry Testing

Testing & diagnosis · Oil Sentry switch

From a Kohler service manual covering: CH18, CH20, CH22, CH23, CH25, CH620, CH630, CH640, CH670, CH680, CH730, CH740…. Check it applies to your exact model before use.

Applies to: Kohler CH18, Kohler CH740

Procedure

  1. Connect continuity tester across blade terminal and metal case of switch. With 0 psi applied, tester should indicate continuity (switch closed).
  2. Gradually increase pressure; through range of 3-5 psi tester should change to no continuity (switch open). Switch should remain open as pressure increased to 90 psi maximum.
  3. Gradually decrease pressure through 3-5 psi; tester should change to continuity (switch closed) down to 0 psi.
  4. Replace switch if it does not operate as specified.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • 3-5 psi
  • 90 psi maximum

Full service-parts list: Kohler CH740 →

Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

More Kohler repair guides →