Hot runner cables are another area that can create problems. Something as simple as having a wrongly wired cable can lead to problems. The cable must be wired such that each zone is correctly attached to the pin at each end of the cable; in other words pin 1 on plug 1 must be wired to pin 1 on plug 2. Cables can be swapped out to verify that they are not the root cause, and if the cables are swapped and the problem is resolved the original cable should be checked for continuity from one plug to the other.