Carrier 30GB660002 Thermister 30067439-890 the Lennox 28G80 may be

the Lennox 28G80 may be stuck in the open position

The Watts 0556001 (model 100XL-8-150) is a heavy-duty 3/4 inch T&P relief valve engineered for critical temperature and pressure protection in water heater and storage tank applications

Using this in steam service will cause premature failure of the EPDM seals

ensuring zero bypass

This model is a direct cross-reference for the Danfoss 7303507

Carrier 30GB660002 Thermister 30067439-890 the Lennox 28G80 may beThe Carrier 30GB660002 Thermister is a critical OEM replacement temperature sensor designed for precision monitoring in commercial chillers and applied HVAC systems. Engineered to meet the exact specifications of the Carrier 30GB and 30GT series, this 10K Ohm sensor delivers accurate feedback for Entering Water Temperature (EWT), Leaving Water Temperature (LWT), Outside Air Temperature (OAT), and Return Gas Temperature (RGTA). As a direct successor to