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Teaseltun
Liability will be dependent on the nature of the fault. If the meter has failed and left you off supply, then the liability is somewhat different to a fault such as incorrectly recording your energy usage.
In the first case, they are liable to replace your meter in a timely manner and where this is not done, you are entitled to a compensation payment of £30. If this is not made within ten working days, you are entitled to a second £30 payment.
In the case of a measuring fault, the meter will need to be tested. Your supplier will take your meter away to be tested by an independent meter examiner. They must install a replacement before they do this. The examiner will send you a certificate telling you if the meter is faulty or not.
If it’s faulty, your supplier should replace it. They should also refund you any money they owe you as a result of the fault, for example extra money you paid on a bill.
You might be able to claim compensation too - ask your supplier.
If it’s not faulty, you could have to pay for the cost of the test.
There will be many other scenarios and liability will depend on the scenario.