Apologies if this isn't the proper forum. Bought a house 3 years ago with a gas hearth in addition. Everything seems to be working fine. But when it gets up to tstat temperature, the flame turns off, the fan will blow for a while, then turn off. But then a few minutes later, I'll hear a clicking/whirring sound. The fan will start back up for a few minutes, then turn off, and repeat (usually until I flip the fan off). I'm guessing it's a heat sensor or thermostat? Is this something I could attempt to fix myself (having a hell of a time finding someone willing to service in any reasonable amount of time).