McDonnell & Miller 310473 Kit This is a normally open

This is a normally open (NO) switch

long-term monitoring solution with no moving parts to fail in high-vibration environments

A faulty limit switch often causes the indoor blower fan to run continuously or prevents the burners from igniting

Once the fault is cleared

difficulty lighting the main burner

McDonnell & Miller 310473 Kit This is a normally openEnsuring consistent performance in steam and hydronic installations requires precise sediment management. The McDonnell & Miller 310473, also known as the STR WF2 Strainer and Orifice Kit, is the critical service component for WF 2 Series Uni Match Water Feeders. Professionals recognize that a clogged boiler water feeder strainer is the primary cause of restricted flow and potential dry fire conditions. This comprehensive replacement kit includes a