Furnace Limit Switch 3 Inch Insert C340056P04 Replacement Part For Trane American Standard Heaters 190 Degree Safety Cutoff Plug And Play Easy Install No Tools Needed Keeps Your Furnace From Overheating

Single-Unit 190°F Furnace Limit Switch Insert, 3 Inch
✔️ 3 inch insert, 190 degree limit with plug-and-play install

This limit switch is a safety device that shuts a furnace off if temperatures get too high, helping prevent overheating and protecting the furnace fan and overall heating system. It’s a common replacement part for residential furnaces and is designed for easy drop-in installation on compatible units.

✅ Replaces L190-30F, SWT01259 and furnace fan limit switches
✅ 190-degree cutoff rating provides reliable overheat protection
✅ 3 inch insert size for straightforward, tool-free replacement
✅ Plug-and-play install with no hardware modifications
✅ Green housing helps clear labeling and quick identification
✅ Compatible with common furnace models and standard safety setups

💡 What is a furnace limit switch used for in home heating systems?

These switches act as safety cutoffs, stopping the furnace when the temperature hits the trigger point. They’re a handy, simple upgrade that helps prevent damage and downtime due to overheating.

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- What problems does a faulty limit switch cause? Overheating, furnace shutdowns, and potential component wear
- How easy is a typical replacement? Very handy; designed for plug‑and‑play installs with no special tools
- Why choose a 190°F limit switch? It provides targeted protection for standard heating cycles and reduces risk of overheating