Lennox 15T68 replacement is often necessary when the internal power thermistor or control circuit in the original module fails due to voltage spikes or moisture ingress

including R410A and R134a

or the main burner fails to kick on despite the thermostat calling for heat

or chemically active combustion environments

Siemens Building Technology 656-0018 Valve 318518-761 Lennox 15T68 replacement is oftenThe Siemens Building Technology 656 0018 is a professional grade 3 4" normally open angle valve engineered for the precise proportional control of steam, hot water, and chilled water. Built for terminal unit applications like fan coils, baseboards, and reheat coils, this 2 way pneumatic valve features a 4. 6 Cv flow coefficient and a 3 8 psi spring range. Maintenance is streamlined with a design that allows for stem repacking without a complete system