For safety and appliance certification

The Littelfuse POWR-GARD series ensures consistent response times

If the pilot flame is excessively large

Technicians should verify HVAC part compatibility using model and serial numbers to ensure this specific thermal cutoff matches original factory specifications for the air handler or furnace assembly

Rheem-Ruud 47-21663-09 Limit Switch For safety and appliance certificationThe Rheem Ruud 47 21663 09 Limit Switch is a critical safety component designed for precise thermal regulation within HVAC equipment. This SPST normally closed switch features a fixed open temperature of 150F and a fixed close temperature of 120F, ensuring reliable high limit protection for the heat exchanger. As a green color coded general purpose control, it operates with an automatic reset function, eliminating the need for manual intervention