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Old 05-08-2007, 12:16 PM   #1
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This therm is for the basement air/firnace and heat pump. Recently when I turn on the AC and set it for 79 degrees it works for several hours , holds the temp at 79 but then sometimes it starts cooling lower than 79...it finally stops at 72 and when I check, the set point has moved from 79 and is now 72...
This started after a transformer blew up in the park but I have a progressive surge control and everything else worksfine....Any ideas as to what is going on or how to hold the set point? Should I remove the 12 volt power and see if there is a reboot or reset of some sort? thanks RKL
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Old 05-08-2007, 12:16 PM   #2
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This therm is for the basement air/firnace and heat pump. Recently when I turn on the AC and set it for 79 degrees it works for several hours , holds the temp at 79 but then sometimes it starts cooling lower than 79...it finally stops at 72 and when I check, the set point has moved from 79 and is now 72...
This started after a transformer blew up in the park but I have a progressive surge control and everything else worksfine....Any ideas as to what is going on or how to hold the set point? Should I remove the 12 volt power and see if there is a reboot or reset of some sort? thanks RKL
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Old 05-08-2007, 02:38 PM   #3
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72 degrees is the power-on default. I would guess you are loosing 12-volt power. Check your inverter and maybe the connections to the thermostat.
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Old 05-09-2007, 03:23 AM   #4
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Interesting. I have the same thing happens to mine occasionally. This has been going on about 4 years now. If I reset to the temp I want, it will generally hold that setting. Why it goes to 72 I have no idea, it seems to be a default setting. I will be watching for some of the A/C gurus response to your question. We have returned from a day trip already and found the cat curled up under pillows, because it got so cold when this happens.
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Old 05-09-2007, 07:01 AM   #5
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Your bypass relay may not be holding 100% and could be dropping out occasionally.
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