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Error code reference
Ingersoll Rand Furnace Error Code E04
Open thermal limit, rollout switch, or reverse airflow switch.
SourceIngersoll Rand S9V2 Furnace - Service Facts: Gas-Fired Condensingp. 54, 59, 70-71
Diagnostic procedure
The full E04 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
Verify filters and blower wheels are clean, check if blower motor is running, measure 24 VAC across main thermal limit (YL49-YL51).
SourceIngersoll Rand S9V2 Furnace - Service Facts: Gas-Fired Condensingp. 54, 59, 70-71
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
1 manual in the MyPros+ library documents this code for Ingersoll Rand furnace.
Models covered by the manuals that document this code
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