Speed Gradually Increases or Decreases After Speed Is Set

1. Check to ensure proper operation of bead chain and actuator cable. If found satisfactory, proceed to step 2. If not found satisfactory, adjust or replace as necessary.
2. Check to ensure proper operation of vacuum dump valve. If found satisfactory, proceed to step 3. If not found satisfactory, adjust or replace as necessary.
3. Perform tests on servo. If found satisfactory, proceed to step 4. If not found satisfactory, replace servo.
4. Perform tests on amplifier. If found satisfactory, proceed to step 5. If not found satisfactory, replace amplifier.
5. Examine all connectors to ensure proper contacts.