The diagnostic LED blinks specific codes to identify issues such as flame signal loss

a significant deviation indicates it is time for a replacement

and water ingress

the manufacturer specifies that this rod kit must be installed in conjunction with a valve seat repair kit or a diaphragm replacement kit

The Schneider Electric (Erie) VS3427 Valve Body is a professional-grade 1" NPT 3-way zone valve engineered specifically for low-pressure steam applications up to 15 psi

Lochinvar & A.O. Smith 100110901 Window Observation 326070-701 The diagnostic LED blinks specificUpgrade your system monitoring with the Lochinvar & A. O. Smith 100110901 Window Observation assembly. This genuine OEM sight glass replacement is a critical component for service technicians performing routine combustion analysis or checking burner flame quality in high efficiency Lochinvar boilers and A. O. Smith water heaters. Designed to withstand the thermal stress of sealed combustion chambers, this durable observation port ensures an airtight