Bought a secondhand 5-in-1 unbranded (cheap) heat press off eBay. I hooked it up, set the temp and timer and it doesn’t heat up. The indicator shows 0 for 15-20 seconds then displays - - -. I switched to one of the other elements and same thing. Any idea if this is an easy fix? Everything looks fine inside. All the connections are secure, no frayed wires, no scorch marks, etc.