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If it takes longer now for your kiln to fire, It could be caused by a defective switch or element, or may even be the wall receptacle. If your kiln will not heat, the power cord may not be plugged in, fuses or breakers blown, kiln sitter not activated or power cord blown. If when firing, your wall receptacle or plug heats up, check to see if there is a loose connection in the receptacle. If a kiln makes popping noises when firing, it is normal. This is due to the contraction of kiln parts which are enlarged from thermal expansion.