verifying the 4074ETH pressure switch signal is a standard diagnostic step

Advanced Diagnostics: Simplifies troubleshooting with clear fault code reporting to identify system errors quickly

Flexible Input: Compatible with both 208V and 240V lines

Continuous Discharge: Modulating float mechanism ensures instantaneous condensate removal under varying loads

F (-46 to 121

Lochinvar & A.O. Smith 100299163 Fuse 318172-701 verifying the 4074ETH pressure switchThe Lochinvar & A. O. Smith 100299163 Fuse is a critical OEM replacement part designed for integration within high efficiency commercial boilers and water heaters. As a 250V Time Delay fuse with a 0. 600 Amp rating, it is engineered to protect sensitive control boards and transformer circuits from sustained overcurrent while allowing for the transient inrush currents typical during startup cycles. This slow blow fuse prevents nuisance tripping,