or the furnace control board flashing a "limit circuit open" error code

Sanitation Compliance: NSF certification guarantees the materials and design are safe for use in food processing and storage

A common symptom is the furnace blower running continuously while the burners fail to ignite

High Altitude Performance: Maintains consistent combustion efficiency across various atmospheric conditions when properly calibrated

Raytek MT4 IR Thermometer Els PW 17895 or the furnace control boardAs a field tested non contact infrared thermometer, the Raytek MT4 is a staple in the HVAC technician's diagnostic kit. Engineered for immediate data acquisition, this IR temperature gun operates across a wide range from 0F to 750F ( 18C to 400C), allowing for safe monitoring of evaporator coils, compressor discharge lines, and electrical busbars. With an 8: 1 distance to spot ratio, it provides precise HVAC troubleshooting capabilities without