For safety and reliability

specifically engineered for the Parker 12FS3C2348ACF valve model

Fill space: 20 thousandths of an inch

or if the condenser fan blade requires a manual push to begin rotating (the "stick test")

and diagnostic fault codes on the furnace control board

Lochinvar & A.O. Smith 100208231 Fuse 340155-7026 For safety and reliabilityThe Lochinvar & A. O. Smith 100208231 Fuse is a critical 3. 15 Amp 250V slow blow glass fuse designed specifically for the protection of integrated control boards in high efficiency commercial boilers and water heaters. As a direct OEM replacement part, this 5x20mm cartridge fuse ensures the sensitive electronics of the Lochinvar Knight and Armor series, as well as various A. O. Smith Cyclone models, remain protected from overcurrent events and