How to Start a Gas Furnace

Beginner 1 hour 16 steps 48233 views Rating: 4.7/5 Published: 2026-04-18

Review the furnace instructions.. Inspect the area around your furnace for gas and water.. Supply power to the furnace, if necessary.

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Steps

1

Review the furnace instructions.

Step 1

Review the furnace instructions.

2

Inspect the area around your furnace for gas and water.

Step 2

Inspect the area around your furnace for gas and water.

3

Supply power to the furnace, if necessary.

Step 3

Supply power to the furnace, if necessary.

4

Remove the front furnace access panel.

Step 4

Remove the front furnace access panel.

5

Evaluate the flame of your pilot if it is lit.

Step 5

Evaluate the flame of your pilot if it is lit.

6

Adjust the pilot light if necessary.

Step 6

Adjust the pilot light if necessary.

7

Purge gas in the furnace for unlit pilots.

Step 7

Purge gas in the furnace for unlit pilots.

8

Light non-auto igniter pilots with a long stem lighter.

Step 8

Light non-auto igniter pilots with a long stem lighter.

9

Wait for furnace activation to start pilots with an auto igniter.

Step 9

Wait for furnace activation to start pilots with an auto igniter.

10

Reattach the access panel.

Step 10

Reattach the access panel.

11

Switch on the furnace.

Step 11

Switch on the furnace.

12

Set the thermostat.

Step 12

Set the thermostat.

13

Replace dirty furnace filters.

Step 13

Replace dirty furnace filters.

14

Check the thermostat settings.

Step 14

Check the thermostat settings.

15

Investigate doors, covers, and registers.

Step 15

Investigate doors, covers, and registers.

16

Verify the condition of fuses or circuit breakers.

Step 16

Verify the condition of fuses or circuit breakers.

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