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This is a spark electrode designed for high-voltage ignition systems
A faulty limit switch often causes the indoor blower fan to run continuously or prevents the burners from igniting
Common Questions & Troubleshooting Why is my furnace flashing a 'limit switch open' code
Simplified Service: Direct replacement for York
F after a thermal excursion
Johnson Controls T-4000-2141 Plastic Cover This is a spark electrodeThe Johnson Controls T 4000 2141 is a commercial grade beige plastic thermostat cover designed specifically for horizontally mounted pneumatic thermostats. This impact resistant housing provides a professional finish for pneumatic control systems while protecting internal components from dust and debris. Engineered for the T 4000 series, the cover features a clean aesthetic with the Johnson Controls logo and a single set point window for clear