The 37021 is more than just a replacement part—it's your RV furnace's first line of defense against overheating. Designed exclusively for HydroFlame series furnaces, this high-temperature limit switch ensures safe and reliable heating during every road trip.
How It Protects Your Journey：
As a critical safety component, this normally closed switch monitors furnace temperatures continuously. When abnormal heat levels are detected (exceeding safe operating thresholds), it immediately cuts off the fuel supply to shut down the system, preventing damage to components or hazardous situations. A manual reset is required after activation, ensuring a thorough inspection before restarting—keeping you and your RV protected.
Compatible Models：
This switch fits the following Atwood furnace series:
79XX-II: 7912-II, 7916-II, 7920-II
80XX-II: 8012-II
8935-AC/DC: 8935-AC-II, 8935-AC-III, 8935-DC-II, 8935-DC-III
8940-AC/DC: 8940-AC-II, 8940-AC-III, 8940-DC-II, 8940-DC-III
2-Stage: 2540
Always confirm your furnace's model and serial number against the manufacturer's specifications to ensure proper fit.
Safety Reminder：
Never bypass or modify this limit switch—its role is critical for furnace safety compliance. Regular inspection and replacement of worn switches are essential to maintain reliable operation.