What happens when your heaters three prong electric cord breaks and becomes a two prong cord?

It depend on which prong breaks off. If is its the brass blade the unit will not work. If it is the silver blade the unit will not work.

If it is the ground prong, the unit will work but it will not trip the breaker if a short circuit fault occurs. The heater frame could become energized and if you happen to touch a grounded source when touching the heater frame, a nasty shock could result.

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