the issue lies further upstream in the thermostat or control circuit

The "C" suffix typically denotes a version intended for specific commercial packaging or regional distribution but does not change the technical operation

Using genuine Copeland HVAC parts maintains system integrity and ensures the pump meets the required 60 psi minimum pressure threshold during operational testing

this switch ensures the combustion blower is generating the necessary static pressure to safely vent flue gases before the ignition sequence begins

Lochinvar & A.O. Smith 100170487 Upper Sensor Freon the issue lies further upstreamThe Lochinvar & A. O. Smith 100170487 Upper Sensor (formerly TST1187) is a critical thermistor based component engineered for high precision temperature monitoring in residential and commercial water heaters. As a direct immersion NTC temperature sensor, it provides real time resistance feedback to the control board, ensuring the appliance maintains optimal setpoints while preventing dangerous high limit conditions. This OEM water heater sensor is