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Hello, that is a very dangerous situation, disconnect the floor heater wiring right away.
If the shorted wiring is not in the under floor heating elements themselves, then it is generally repairable... that would be where the wiring comes out from under the floor. If the electrical short in inside the floor heating elements there is a significant risk that it could set the house on fire.
A well experienced electrician would be able to determine the cause, it sounds like the one that came out was lazy and also willing to put your life at risk, unless he indeed found burn wiring at the thermostat he changed. In that case the burnt rubber smell would be residual and harmless.
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