I think there is a French term for this - Moq? (Just kidding, I don't want the bluebird forum to turn in to an "adult" website). But seriously, the extra male could be an unpaired offspring from last year, helping out. It happens, but rarely. Usually the male will chase the youngsters away once nesting season begins. More often, young from the same year's brood might be seen helping out. But I have seen an adult female help raise another's brood. Maybe this happens more than we think, and we just don't see it as "another helper" thinking it is the same adult unless we see them both at the same time as you have. Without name tags or a guest list, we will never really know for sure. Bluebars

It could be just about anything. I was woken up by voices in the middle of the night, once. It took me forever to figure out where they were coming from, but it turned out to be my computer speakers picking up someone's HAM radio conversation. I had to unplug them to make it stop. I plugged them back in the next morning, and it has never happened again. Oh, just thought of another one! I have a Curious George doll for the Grandbabies. He giggles when you squeeze his feet/hands. He sits in a basket under an end table, nice and quiet until the kids are visiting. I switched the wooden table out to one that is glass, and George started giggling on his own at random times, but I couldn't figure out what was causing it. Turns out the igniters on my gas cooktop were doing it. Apparently he was shielded under the wooden table, but not the glass.

I had exact same problem. Except we had some gas leak outside the home (our furnace is inside) and gas and electric company had tightened the gas valve a little more than need to, so the gas did not flow properly to the furnace. We called our friend who is the HVAC specialist and he increased the gas flow at the furnace and now it seems to respond to thermostat much better.

Update and solution for those having a similar problem. I pulled the wires from the thermistor sensor on the body of the heater and put a 10k resistor across the ends. In theory, the control board should have read something like 77 degrees but the temp display exhibited the same erratic behavior. To eliminate the wires as a source of error, I then hardwired the 10k resistor across the two thermistor pins on the control board. Alas, same problem. That meant control board, unfortunately. I bought a new Pentair board on-line for about $310 plus tax. Took me all of about five minutes to install once the section of the heater with the board and display membrane is able to be removed and turned upside down. Guess what? Everything works perfect now. Only downside is that the temp readout on the Pentair board is less bright than what I had on there before, but it's not a big deal. End of problem. I love those sorts of outcomes! Nick in Palm Springs