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Troubleshooting Gas Furnaces and Heaters
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Troubleshooting Gas Furnaces and Gas Heaters
There are many potential reasons that a furnace might not be working, but fortunately, many of the solutions are as easy as pressing a button. Use this chart to fix a wide range of conditions that prevent your furnace from working. If none of these works, please give us a call.GAS AND FURNACE HEATER TROUBLESHOOTING CHART
| Problem | Possible cause | Solution |
| Furnace won't run |
1. No power. |
1. Check for blown fuses or tripped circuit breakers at main entrance panel, at separate entrance panel, and on or in furnace; restore circuit. |
| 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. |
|
| 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 blower assembly. |
|
| 4. Registers closed or blocked. |
4. Make sure all registers are open; make sure they are not blocked by tugs, drapes or furniture. |
|
| 5. System out of balance. |
5. Balance system. | |
| 6. Blower belt loose or broken. |
6. Adjust or replace belt. |
|
| 7. Burner dirty. | 7. Call a professional. |
|
| Pilot won't light |
1. Pilot opening blocked. |
1. Clean pilot opening. |
| 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, 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. |
| 2. Belts sticking, worn, or damaged. |
2. Spray squeaking drive belts with belt dressing; replace worn or damaged belts. |
|
| 3. Blower belts too loose or too tight. |
3. Adjust belt. |
|
| 4. Motor and/or blower needs lubrication. |
4. If motor and blower have oil ports, lubricate. |
|
| 5. Burner dirty. | 5. Call a professional. |
For more information or immediate help, Contact Us.
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