Anyone know the correct size for the F4C fuse on a Otis 23UCL Controller. I found a 15AMP time delay here on a job and the insulation on the wires associated with this circuit are is begining to crack and melt and the wires were extremely hot. All other fuses on the terminal block are standard 10 AMP. I looked in the other controller on the job and it had a 6A standard fuse. The prints do not say what size fuse it needs. Pictures are attached.