Customer stated that intermittent times the system can be running and cooling, and after a while the system will switch to heat mode but still show cooling on the thermostat. the customer stated that it does not happen all the time. It’s very irregular at best once a week it happens. They will typically shut the breaker off and then wait a while and turn the breaker back on and then the system runs fine afterwards. I ran the system for 30 to 40 minutes to see if it would Reoccur and the system ran fine and cooling. The customer has zone control with zone dampers installed in the system with one master control in the bedroom and two remote controls and two spare bedrooms. The thermostat that’s in the master bedroom is a T con thermostat in which it is showing signs of failure as it’s very tough to press options on the screen And the thermostat at times is non-responsive. Advise the customer to continue to monitor it and if the same thing happens again to look at the thermostat to see i