Error code reference

Trane Furnace Error Code 7

System lockout Retry: 3 unsuccessful tries for ignition within a single call for heat; flame has never been sensed.

SourceTrane Furnace - Service Manual: UD2/DD2 Two-Stage Induced Draftp. 11, 16, 25

Diagnostic procedure

The full 7 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

First diagnostic step

Disconnect electrical power to furnace, connect manometer to inlet gas pressure connector, verify inlet gas pressure is within specifications.

SourceTrane Furnace - Service Manual: UD2/DD2 Two-Stage Induced Draftp. 11, 16, 25

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

2 manuals in the MyPros+ library document this code for Trane furnace.

Models covered by the manuals that document this code

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The full 7 procedure

Where this code is documented

Models covered by the manuals that document this code

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