sanders2222 Posted November 18, 2011 Posted November 18, 2011 For giggles I pulled up a picture of my thermostat heat set point between July 15th and the present. I was surprised to see spikes up to 255 degrees and down to 16 degrees (see image below). What's with that? I only control the t-stat from the ISY but my programs are pretty simple. Plus, for the most part, seem to be operating my HVAC correctly. I did experience recent behavior where my t-stat was turning itself off and my ISY locked up this month. I also called Smarthome and because my t-stat dongle was v2.0 and the ISY locked up, they are going to send me a upgraded plug-in. So my hope is these spikes could be related to the old plug-in going/gone bad.
chadodes Posted November 30, 2011 Posted November 30, 2011 For giggles I pulled up a picture of my thermostat heat set point between July 15th and the present. I was surprised to see spikes up to 255 degrees and down to 16 degrees (see image below). What's with that? I only control the t-stat from the ISY but my programs are pretty simple. Plus, for the most part, seem to be operating my HVAC correctly. I did experience recent behavior where my t-stat was turning itself off and my ISY locked up this month. I also called Smarthome and because my t-stat dongle was v2.0 and the ISY locked up, they are going to send me a upgraded plug-in. So my hope is these spikes could be related to the old plug-in going/gone bad. Glad, I'm not the only one. Let me know if you make headway, I'm too lazy at the moment to diagnose.
smurt Posted December 7, 2011 Posted December 7, 2011 good luck. I have been working this problem for over a year. It reared its ugly head in the Summer of 2010 when the system set my Cool setpoint to 16 degrees. this is a second home and we are not around much in the summer. I caught it after 2 days. It was 110 outside and 60 degrees inside. luckily no damage was done to the air conditioner, just my pocket book. I have since created a program that catches these set point changes and resets the Thermostat to acceptable levels. I worked with Smarthome for a number of months and have passed info to the UD team on and off but no one can figure out what is causing this. its still happening and I cannot find any kind of pattern. I have even had conversations with my security company to see when they probe hoping it may occur at the time of a spike.
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