To even suggest disconnecting the earth means you should not be doing any sort of electrical work. It is often said on the forum to 'get an electrician in', this is a prime example of why it is said.
Two options:
1. Disconnect the mat and chop off the conductors so they can never be connected.
2. Rip the whole lot up and start again.
The vast majority of manufacturers will insist on testing at various points of installation to avoid this scenario.
Two options:
1. Disconnect the mat and chop off the conductors so they can never be connected.
2. Rip the whole lot up and start again.
The vast majority of manufacturers will insist on testing at various points of installation to avoid this scenario.