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As the subject says, the PDA handheld won't connect and says waiting. iAquaLink shows no connection (Red dot). It did this yesterday and I changed out the CR2032 battery in the panel and it worked. But today it stopped working again. I'm leaning towards a falling RS485 interface but wouldn't...

I have the subject heater and went to check the flue temperature while I was back at the equipment. I wasn't thinking about it in depth and instead of pressing and holding the Poll On button to get the flue temperature reading, I hit the Heater Off button. Now I can't get it to turn back on. It...