is usually a symptom of a larger airflow issue

preventing the heater from firing

resisting material fatigue from constant pressure modulation

ensuring the system remains offline if an over-temperature condition occurs until a technician can diagnose the root cause

Common Questions: Is the Conbraco 10-408-05 suitable for steam applications

Armstrong Furnace R40787-001 Outdoor Stat Kit Els PW 17895 is usually a symptom ofThe Armstrong Furnace R40787 001 Outdoor Stat Kit is a field installed component designed to optimize heat pump balance point control and secondary heat source management. This outdoor temperature sensor allows for precise lockout of electric heat strips or gas furnaces when ambient temperatures are sufficient for high efficiency heat pump operation, preventing inefficient simultaneous heating. As a genuine OEM HVAC replacement part, the R40787 001