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Mine lasted five years when it started to run my hot water temperature up to 212 Fahrenheit whenever there was a power outage. This caused my geothermal compressor to blow it's pressure relief valve. This is not cool because this is the weak spot of my geothermal compressor: Pressure too high in the system could cause a $2000 repair. After researching on the Internet, I discovered that this is a common failure mode for this device. Now I have to replace this thermostat after only five years. Bummed.
My defective unit is also throwing an E2 memory error code. The workaround is to change the degrees to Centigrade. Weird.
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