I have a Clare furnace that has been problematic ever since I moved in 1 1/2 years ago. Recently it has been igniting inconsistently. It will be running ok and then when the temperature has dropped the exhaust motor will start but the ignigition sequence does not seem to start and it continues to run until I turn it off. It has a heat element ignition sequence which I have had to replace twice since moving in. I have had success getting it to run by turning it off and letting it sit for 20-30 minutes and then resetting it. But it will only work for that one cycle. Any suggestions?