This Normally Open (N/O) differential switch monitors the vacuum created by the draft inducer motor to ensure proper combustion air flow before allowing ignition

Durable Construction: Engineered to withstand continuous operation cycles in energy recovery systems without premature cracking or fatigue

While light oxidation can sometimes be removed with a fine abrasive pad like Scotch-Brite

When you are troubleshooting a standing pilot system that won't stay lit

What are the signs of a bad 50 MFD capacitor

Honeywell 394530 Thermocouple Tester Els PW 17895 This Normally Open (N/O) differentialHoneywell 394530 Thermocouple Tester 394530 is identical to 394530 U, THERMOCOUPLE TEST