Code 21 — Gas Heating Lockout

¿Qué significa 21 ?

The system has locked out gas heating operation. The system will use heat pump heating if available.

• Failure in the gas heating components
• Control board malfunction
• Safety switch tripped
• Gas valve issue

Haga clic en los pasos para seguir su progreso.

1. 1

   Check if the gas supply to the unit is adequate.

2. 2

   Inspect for any error codes related to ignition or flame proving.

3. 3

   Ensure safety switches are not tripped.

4. 4

   Contact an HVAC technician for gas heating system diagnosis.