Furnace won't turn on after new AC installation
The gas valve may have been left closed or something was missed during the recent HVAC installation, preventing the furnace from starting up when the weather turns cold. Homeowners worry that waiting too long to report the issue will make the warranty company or contractor upset about the delay.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Checking the door latch, suction nipple, board power, and considering bridging the R-W wires
- 2Waiting a week before opening up a service request
- 3Checking if the gas stop and service valves are actually on
- 4Observing the furnace startup sequence and inducer fan
- 5Counting flashing diagnostic error codes on the furnace control board
- 6Calling a professional HVAC technician
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“My question is I just noticed this week when it was getting cold my furnace won't turn on.”source ↗
“My question is should I wait at least a couple months to open up a service request, it seems like it will send the same company out and I am worried they will be upset I didn't notice it last month..”source ↗
Where this came up
People with this problem also raised
- 2Why is one newly installed thermostat not turning on?
- 3Why does my thermostat keep losing power and resetting?
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- 3Why won't my water heater pilot light stay lit or spark?
- 2Why won't lights work after changing parts or wiring?
- 9Car won't start after replacing ECU and electronics failed