I have two zone house with RiteTemp 6030 thermostats on each zone, had them for almost a year now without a problem. However, today noticed strange behavior - air cooler would not turn off.
The main thermostat has temperature set at 76C and after reaching 74C I would still hear the fan and get cold air. To start testing I turned off zone 2 (upstairs) and would still get full cold air flow - the main thermostat would not turn off even when I set temperature to 68C. Tried resetting main thermostat, nothing helped. Tried heat and it works fine with fan and heat off once temperature was above the threshold.
Batteries are good - changed them about a month ago, although they are Kodak brand, but not sure if brand matters.
What could be the problem? Is it the thermostat or the cooling system?