Gas Furnaces FAQ

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas and 120v electrical equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page.

There are a number of potential causes for this symptom (Ex: Incorrect power to the furnace, door switch issue, faulty transformer, incorrectly wired thermostat, and more).

For further information and a troubleshooting flow chart, please download the Troubleshooting Guide. (PDF 2.7 MB)

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas and 120v electrical equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page.

This symptom can occur if:

• The exhaust venting or termination is blocked or damaged. Please inspect and correct any issues if found.
• The low-fire pressure switch may be stuck closed or a wire may be loose. For a troubleshooting flow chart, please download the Troubleshooting Guide. (PDF 2.7 MB)

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas and 120v electrical equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page.

What do these number of flashes potentially mean?

• Three flashes indicates that the low pressure switch could be stuck open.
• Six flashes indicates that a pressure switch cycle lockout has occurred.
• Thirteen flashes indicates that the high pressure switch could be stuck open.

For further information and a troubleshooting flow chart, please download the Troubleshooting Guide. (PDF 2.7 MB)

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas and 120v electrical equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page.

These flashes indicate that the limit/rollout safety switch is open, and the specific number of flashes tells you for how long:

• Four flashes - Open less than five minutes.
• Five flashes - Open longer than fifteen minutes.
• Eleven flashes - Open from five minutes to fifteen minutes.

For further information and a troubleshooting flow chart, please download the Troubleshooting Guide. (PDF 2.7 MB)

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas and 120v electrical equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page.

Seven flashes indicates that the system is locked out due to failure to ignite the burners.

This can occur if:

• The gas valve is not operating correctly.
• The flame sensor is not "seeing" the burner flame.
• The internal condensate trap was manufactured incorrectly.*

For further information and a troubleshooting flow chart, please download the Troubleshooting Guide. (PDF 2.7 MB)

*A small quantity of earlier units contained an incorrectly manufactured condensate trap. If the serial# on the furnace's rating label starts with three digits that are lower than "960", please refer to this service bulletin (PDF 0.5 MB) for additional information and resolution.

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas and 120v electrical equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page.

Eight flashes indicates that the system is locked out due to the burner dropping out.

This can occur if:

• The gas valve is not operating correctly.
• The flame sensor is not "seeing" the burner flame.

For further information and a troubleshooting flow chart, please download the Troubleshooting Guide. (PDF 2.7 MB)

No.

Our furnace comes configured for natural gas, but a conversion kit is supplied with the product for installations where liquid propane will be the fuel type.

Instructions for the conversion can be found within the contents of the kit.

Safety Notice - This is a gas-fired product, and only professionals who are qualified to work on live gas and 120v electrical equipment should do so. If you are in need of a qualified professional in your area, please use this contractor search page.

As with all combustion equipment, there are certain maintenance points that should be checked at least once per year:

1. The exhaust venting and vent termination should be checked to ensure that there are no blockages, damage, or flue gas leaks.

2. The exhaust connector should be in place, slope upwards away from the furnace, and be free of holes, damage, or corrosion.

3. The interior of the furnace should be inspected for loose or damaged wiring.

4. The heat exchangers and fan blower should be inspected for corrosion, deterioration, or debris.

5. The return air ducting should be physically sound, fully sealed to the furnace cabinet, and terminates outside the space that contains the furnace.

6. The physical support of the furnace must be sound, with no sagging, cracks, or gaps around the base so as to provide a seal between the support and the base of the furnace.

7. There must be no obvious signs of deterioration or damage to the furnace.

8. The pilot and burner flames must be in good condition and adjusted properly.

9. The condensate drain and trap should be free of leaks or cracks.

10. Drain the trap, clean it, and fill with fresh water.

11. The flame sensor should be carefully cleaned and tested.

12. Installer-supplied air filters should be cleaned, or replaced.

For further details and specific instructions for the details listed above, please download the Installation, Operation, and Maintenance Manual. (PDF 4.2 MB)