As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB CREW BECAME AWARE THE WING ANTI-ICE WAS NOT WORKING. FOLLOWED QRH. CONTACTED ATC AND DECLARED AN EMERGENCY AS THEY WERE IN ICING CONDITIONS AND REQUESTED AN EXPEDITED DECENT TO FL100. UPON REACHING FL100, EMERGENCY CANCELLED. LANDED WITHOUT INCIDENT. PAX WERE ADVISED PRIOR TO DECENT AND DID NOT BRACE. R&R WING ANTI-ICE HEAT SWITCH.