Furnace won't run

1. No power

2. Switch off

2. Turn on separate power switch
    on or near furnace

3. Motor overload

3. Wait 30 minutes; press reset
    button. Repeat if necessary

4. Pilot light out

4. Relight pilot ONLY if you know how     to do so and are comfortable with     doing so.
    Otherwise, call a professional.

5. No gas

5. Make sure gas valve to furnace is
    fully open

Not enough heat
 

1. Thermostat set
    too low

1. Raise thermostat setting 5°

2. Filter dirty.

2. Clean or replace filter

3. Blower clogged

3. Clean blow assembly ONLY if
   you know how to do so and are            comfortable with doing so.    Otherwise, call a professional.

4. Air vents closed
    or blocked
 

4. Make sure all ducts are open;
    make sure they are not blocked
    by rugs, drapes or furniture.

5. System out of                 balance

5. Call a professional

6. Blower belt loose
    or broken

6. Call a professional.
 

7. Burner dirty 

7. Call a professional.

Pilot won't light

1. Pilot opening                 blocked.

1. Clean pilot opening ONLY if
   you know how to do so and are            comfortable with doing so.    Otherwise, call a professional

2. No gas

 

2. Make sure pilot light button
    is fully depressed; make sure
    gas valve to furnace is fully open

Pilot won't
stay lit

1. Loose or faulty
    thermocouple

1. Tighten thermocouple nut
    slightly, if no results, call a                     professional to replace                        thermocouple

2. Pilot flame set
    too low

2. Adjust pilot so flame is
    about 2 inches long

3. Electric pilot faulty

3. Call a professional

Furnace turns
on and off
repeatedly

1. Filter dirty

2. Motor and/or blower
    needs lubrication

1. Clean or replace filter

2. If motor and blower have
    oil ports, lubricate

Blower won't
stop running

1. Blower control
    set wrong

1. Reset thermostat from
    ON to AUTO

2. Limit switch set             wrong

2. Reset limit switch
    for stop-start cycling

3. Limit control
    needs adjustment

3. Call a professional
 

Furnace noisy

1. Access panels             loose

1. Mount and fasten access
    panels correctly ONLY if
   you know how to do so and are            comfortable with doing so.    Otherwise, call a professional

2. Belts sticking, worn,
    or damaged

2. Spray squeaking drive belts
    with belt dressing; call a                         professional to replace worn
    or damaged belts.

3. Blower belts
    too loose or too             tight.

3. Adjust belt ONLY if
   you know how to do so and are            comfortable with doing so.    Otherwise, call a professional

4. Motor and/or
    blower needs
    lubrication

4. If motor and blower
    have oil ports, lubricate
 

5. Call a professional