What are the signs of a failing flame sensor

If the flame is correct but the output remains low under load

indicating incomplete combustion and potential CO hazards

or burner cutout circuits

technicians should first inspect the pneumatic tubing for condensation or debris and verify the venting is clear of obstructions

Nordyne 669684R TXV 340793-762 What are the signs ofAs a technician, you know that maintaining precise superheat is non negotiable for system longevity, and the Nordyne 669684R TXV is the specified OEM component for 4 ton R410A evaporator coils. This thermostatic expansion valve (TR6 series) is engineered to replace older Danfoss or Nortek models, providing the accurate refrigerant metering required to prevent liquid slugging and ensure optimal heat transfer across the A coil. Whether you are servicing