econoburn patched up. Did a test fire 2 days ago, temp reading started at about 40 degrees, started fire, temp started falling (never went up at all) until it got to about minus 30 degrees and then the pressure relief valve blew several times over several hours. Controller started showing "error" and fan turned off. After it cooled off, error cleared, and fan restarted. Never seen that before. Called Dale, he isn't sure. Checked boiler today, no leaks, temp started at 50 degrees, started another smaller fire, temp started falling (never went up at all), stopped feeding it when it hit 30 degrees, don't want to blow the relief valve again. any ideas?