Tempstar 4 Flashes Error Code

What does Tempstar 4 Flashes mean?

On a Tempstar packaged gas/electric unit, the integrated gas unit controller (IGC) LED flashing four times indicates an ignition lockout fault. Table 5 of the installation manual lists four flashes as this status code, meaning the control has locked out gas heating after failing to successfully ignite and prove the burner flame.

Symptoms

• IGC LED flashes four times instead of staying continuously on
• No gas heat despite a call for heating
• Burners do not light or fail to stay lit through ignition attempts
• Unit remains in lockout until reset

Common causes

• Failure to establish flame during the ignition sequence
• Interrupted or insufficient gas supply
• Direct-spark ignition or flame proving problem
• Combustion air or pressure switch issue preventing ignition

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Diagnostic steps

1. Confirm the LED code

   Remove the control access panel and verify the IGC LED is flashing four times, identified in Table 5 as an ignition lockout fault.

2. Verify the gas supply

   Confirm the gas supply is on, has been purged, and that piping has been checked for leaks per the manual before retrying ignition.

3. Reset the control

   Break the call for heat to reset the control, then restore it so the IGC re-runs its pre-purge and ignition sequence.

4. Observe the ignition attempt

   Watch whether the induced-draft motor runs, the burners spark, and a flame is established to pinpoint where the sequence fails.

When to call a professional

Call a qualified service technician if the unit locks out repeatedly. Ignition lockout involves the gas valve, ignition control, and flame proving circuit, and the manual states this equipment is intended for service by a qualified technician with proper tools and test instruments. Never purge gas into the combustion chamber or jumper a safety device; gas ignition faults should be diagnosed professionally.