S1-02530788700 REPLACEMENT FS

🔥 What it is

York S1-02530788700 Flame Sensor is a replacement flame sensor used in gas furnaces to confirm that the burner flame is present after ignition.

⚙️ What it does

• Detects whether the furnace burner has a stable flame
• Sends signal to the control board to keep the gas valve open
• Shuts the furnace down if no flame is detected (safety protection)

🏭 Where it’s used

Common in HVAC systems by:

• York
• Coleman
• Luxaire

🔁 Replacement meaning (“FS”)

• “FS” = Flame Sensor
• “Replacement FS” = aftermarket/OEM replacement part for the original sensor assembly

⚠️ Why it matters

If this part fails or gets dirty:

• Furnace may start then shut off
• Furnace may not heat at all
• You may get intermittent heating cycles