A replacement flipper coil gets hot and burns out soon after fitting.

New flipper coil overheats and burns

Cause: The end-of-stroke switch never opens (broken blade tip, poor adjustment, welded contacts), or the capacitor across it is shorted.

Checks

• Check the end-of-stroke switch opens at full stroke.
• Test the capacitor across the end-of-stroke switch for a short.

Fix

• Clean, adjust or replace the end-of-stroke switch.
• Replace a shorted capacitor.

Systems

• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C
• WPC Alpha-Numeric
• WPC Dot Matrix

Related tips

• Flipper coil burns or flipper very weak after a rebuild
• Pre-Fliptronics flipper coil smokes when held up
• Flipper coil gets very hot
• Fitting a parallel FL11630 or FL11722 flipper coil
• Pre-Fliptronics: flipper runs very hot or sticks up and burns
• Flipper coils have two windings
• How the two windings of a flipper coil work
• Testing flipper coil diodes

Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer