Tempstar 3 Flashes Error Code

What does Tempstar 3 Flashes mean?

On a Tempstar packaged gas/electric unit, the integrated gas unit controller (IGC) LED flashing three times indicates four consecutive limit switch faults. Per Table 5 of the manual, this escalated status code appears when the limit switch has repeatedly opened on high leaving-air temperature within a short span, signaling an ongoing overheat condition rather than a single trip.

Symptoms

• IGC LED flashes three times instead of staying continuously on
• Repeated interruption of gas heating
• Blower runs while burners are shut off
• Heating performance is poor or intermittent

Common causes

• Persistently restricted or inadequate heating airflow
• Dirty filter or blocked supply and return ducts
• Blower motor or speed setting not matched to the heating load
• Temperature rise consistently above the approved range

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Diagnostic steps

1. Confirm the LED code

   Remove the control access panel and verify the IGC LED is flashing three times, which Table 5 defines as four consecutive limit switch faults.

2. Restore proper airflow

   Replace a dirty filter and open any closed registers so the unit can produce a temperature rise within the range stamped on the rating plate.

3. Verify blower operation and speed

   Confirm the blower runs at the correct heating speed; the manual notes the high speed is for high-static cooling only and must not be used for gas heating on single-phase units.

4. Clear the fault and retest

   After correcting airflow, cycle the call for heat and watch the LED to confirm normal continuous operation returns.

When to call a professional

Call a qualified service technician if three flashes continue after airflow and blower speed have been verified. Repeated limit trips point to a deeper airflow, blower, or heat exchanger problem that needs professional diagnosis. The manual states this equipment must be serviced by a qualified technician with proper tools, and warns that jumpering safety devices is unsafe.