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Audible buzzing typically indicates undervoltage
If you experience continued flow when the branchline pressure is at the maximum (30 psi safe air limit)
preventing control circuit dropouts
When servicing an RPZ
If you observe erratic sparking or hear arcing against the furnace cabinet
Warrick 26B1D1B Series 26 LWCO 30067439-890 Audible buzzing typically indicates undervoltageThe Warrick 26B1D1B is a heavy duty Series 26 low water cut off (LWCO) designed for reliable liquid level control in commercial and industrial boiler applications. Engineered with a 120 VAC supply voltage and a SPDT N. O. configuration, this induction type controller utilizes the conductivity of the fluid to complete a circuit, ensuring precise monitoring and protection against low water conditions. The 26B1D1B model features an internal manual reset