You can fix this
Likely cause: the gas handle is off
A gas handle turned across the pipe means no gas reaches the furnace. Turn it back on only if you know why it was off.
Why this happens
Trane lists a gas supply shutoff among the reasons a furnace won't ignite. HVAC.com explains that a handle perpendicular to the gas pipe is off, and in line with the pipe is on. Lennox notes most furnaces made since 2010 have no standing pilot, but older ones may need a pilot relit after the gas has been off.
How to fix it
- If you turned it off yourself, or know who did and why, and you smell no gas, turn the handle so it lines up with the pipe.
- If you don't know why it was off, leave it off and call an HVAC technician or your gas utility. Don't go looking for a leak.
- Set the thermostat to Heat and give the furnace a few minutes to light.
- If your furnace has a standing pilot light that went out while the gas was off, call an HVAC technician to restart it.
When to stop. If you smell gas at any point, leave the house and call 911 or your gas utility from outside.
If this does not fix it, tell the HVAC technician
- That the gas handle was off, and whether you know why.
- Whether the furnace lit once gas was back on.
- Whether the furnace has a standing pilot light.
Build the full list: what to tell the HVAC technician.
Start this troubleshooter over
Vent, Valve & Volt is published by the team behind FourHome. Browse all FourHome replacement faucet and shower parts on the FourHome Amazon store.