causing the F1 (5 Amp) or F3 (

or an undersized duct system causing the heat exchanger to overheat

ensuring compliance with rigorous safety codes and standard piping requirements

OEM Fitment: Drop-in replacement for specific Carrier and Bryant packaged units

and 97L4801

Lochinvar & A.O. Smith 100109888 Gas Valve 320788-704 causing the F1 (5 Amp)The Lochinvar & A. O. Smith 100109888 Gas Valve is an OEM natural gas control valve engineered for precision combustion in high efficiency boilers and water heaters. Designed for 24V applications, this negative pressure gas valve facilitates the exact air to fuel ratio required for modern condensing units. For technicians troubleshooting a "GV Relay Fail" or ignition lockout, this valve serves as the direct replacement to restore reliable burner