Skip to main content
Error code reference
Trane Furnace Error Code 7 Flash
External gas valve circuit error: 24 volts is present at the gas valve when it should not be present.
SourceTrane XV95 Gas Furnace - Tech Sheet: Variable Speed ModelsPage 27/31/40
Diagnostic procedure
The full 7 Flash procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Turn comfort control to OFF position; check if 24 VAC nominal voltage is present between red lead at gas valve connection to chassis ground.
SourceTrane XV95 Gas Furnace - Tech Sheet: Variable Speed ModelsPage 27/31/40
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock 7 Flash procedure $9.95
Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.
Where this code is documented
3 manuals in the MyPros+ library document this code for Trane furnace.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax