Hello all, I tried to start our Heatilator CD4236IR natural gas fireplace during a recent power outage. Loaded two D batteries into the tray, unplugged the transformer, and flipped the wall switch. Nothing. Repeated same steps while also unplugging the fan I separately installed years ago. Still nothing. Any suggestions? Would love to avoid the service call if possible. Fireplace works fine otherwise. Contacted Heatilator but they weren't any help. Thanks.