We have a Coleman Evcon DLAS075BDD furnace which keeps displaying error codes: 1-Ignition Failure and 4-Limit cycling. We have replaced the circuit board. Inspected the ignitor and the flame sensor and both appear good. Also have taken the exhaust vent/hood off and vaccuumed out any rust to ensure it is clear. After performing these measures it still showing a 4-limit cylcing error. This error seems to be happening most often when it is windy. Do I need to extend or replace the vent cap? Very frustrated normally able to troubleshoot problems. Any suggestions would be helpful...
