I stopped working in my office on the weekends (low temperature in the office when it's closed for holidays). There are no bubbles in the sensor. Temperature 63%. Writes "ON" but does not heat up. No change in the last 3 hours since setting it to 78 degrees, I've had it for less than a year. It's been great so far. Annoying that I now have to leave work to buy a heater
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