I have a gas Trane central A/C unit, 4 units/zones in my house, and one unit/zone isn't working (the other 3 work fine). If I shut the thermostat off for that zone for an extended period of time, the fan and compressor will work for the first cycle (although it will cool the zone the air flow does not feel as strong as in the other zones), but after it reaches the set temp and shuts off it will not cycle back on when the temp exceeds the setting.
I do hear the thermostat "click" when the preset temp is reached, but there is no air flow in the house in that zone and the outside fan/compressor for that zone does not activate, so the problem does not appear to be the thermostat. The breakers for the ac unit have been checked and they are fine.
I had a local HVAC company come by and they said the freon was fine, and because I had it off before they came, when they turned it on and the fan/compressor came on they said it was fine and left without checking if it would come back on after it cycled (which it did not).
Very strange, and I can't find a good local HVAC company. Any thoughts on what may be the problem?