KF27 - Check HFC Relay

- Key "OFF".

- Low Fan Control (LFC) relay disconnected.

- Disconnect High Fan Control (HFC) relay.

- Key "ON".

- Does fan continue to run?

Yes -- Go to KF28. KF28 - Check LFC Power-to-Fan Circuit For Short to Power

No -- With A/C, key "OFF". Go to KF30. KF30 - Check Dual Function A/C Pressure Switch

Without A/C, replace HFC relay. Reconnect LFC relay. Re-evaluate symptom.