My BW gas water heater pilot is not igniting. It has an automatic igniter (pilot does not stay on). The blower vent comes on but the pilot occasionally does not. This is becoming more frequent - daily! I can hear a small click in the pilot assembly but the pilot ingniter does not fire. If I manually light, then the burner fires normally. Model # MITW50L6BN15 Serial # BB5925888
Thanks for ANY information!