the thermocouple is likely no longer producing the necessary millivoltage to hold the gas valve open

This genuine Weil McLain part is engineered to withstand the rigorous thermal cycling and positive pressures typical of the Ultra gas boiler heat exchanger

OEM Compatibility: Direct Carrier replacement motor ensuring exact fitment for HD52AR237 part numbers

Why is the blower not turning on in "Auto" mode

Universal 24V AC/DC coil allows for versatile integration with modern smart thermostats and vintage equipment alike

Copeland Comfort Control (Alco) 805350 Pressure Transducer 320788-703 the thermocouple is likely noPRESSURE TRANSDUCER . 8 TO 7BAR 805350 is the direct replacement for 802333,?802351,?PT5 07M