Tempstar 5 Flashes

What does Tempstar 5 Flashes mean?

On a Tempstar packaged gas/electric unit, the integrated gas unit controller (IGC) LED flashing five times indicates a pressure switch fault. Per Table 5 of the manual, five flashes is this status code. During the heating sequence the pressure switch must confirm the induced-draft motor is moving sufficient combustion air before the burner sequence is allowed to begin.

Symptoms

• IGC LED flashes five times instead of staying continuously on
• Burner sequence does not start on a call for heat
• Induced-draft motor runs but ignition does not proceed
• No gas heating output

Common causes

• Pressure switch not confirming adequate combustion airflow
• Blocked or restricted flue or combustion air path
• Weak or failing induced-draft motor
• Faulty pressure switch or disconnected hose/wiring

Diagnostic steps

1. 01

   Confirm the LED code

   Remove the control access panel and verify the IGC LED is flashing five times, which Table 5 identifies as a pressure switch fault.

2. 02

   Check the induced-draft motor

   On a call for heat, confirm the induced-draft motor runs its pre-purge; the pressure switch must sense it moving sufficient combustion air before burners light.

3. 03

   Inspect the flue and combustion air path

   Look for blockage or restriction in the flue hood and combustion air openings that would prevent the switch from closing.

4. 04

   Cycle the call for heat

   After clearing any obstruction, break and restore the call for heat so the IGC re-checks the pressure switch and resumes the burner sequence.

When to call a professional

Call a qualified service technician if five flashes persist after the flue and combustion air paths have been checked. Diagnosis involves the induced-draft motor, pressure switch, and venting, which the manual reserves for a qualified technician with proper tools. Combustion and venting faults can produce hazardous conditions, so professional service is warranted when the cause is not obvious.