I have an Englander 25-PAH and it has started to sound like an old typewriter. I bought it new and this is its 3rd season and it's started with this crazy clicking sound when the fans kick on. Sometimes it'll not make the sound for hours but then it comes back, loud and with no real rhythm to it and a faint rubbing sound behind it. I thoughtaybe a pellet got stuck in a fan and have tried to peak in both fans and clean out any debris and dust but can't seem to pinpoint the noise source. Any thoughts?