Water it! Best water is clean or filtered, or solarized, or rain water. Water
in between layers. if pile dries out then cover with a trap. Be careful not to over water.
without water the pile will not cook up. A good idea is to use a sprinkler can that the
water has been allowed to sit over night in. Add a little seaweed (or
SuperSeaweed)
or fish emulsion to increase bacterial activity.
Nitron A-35 or
Agri-Gro
is good for this too.
It is also possible that the compost pile is getting too hot and drying out. Just becarful with your mixtures.