A/C problem

Flux capacitor malfunction

How old is the thermostat? Is it digital?

Based on what you’re saying here it sounds like the thermostat is not sending a request for cooling?

Check yellow to red thermostat wires for voltage with a multimeter when it’s supposed to be asking for cooling

How many amps is the chrome canipulator drawing?

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Have you checked your pan for any water? You could have a clog in the drain line or your evaporator coil needs to be clean and it causing the pan to fill with water. They have an automatic shut off switch on your pan when it fills.

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Similar issue here, but last night I saw the nest shut the system down for a 5 minute delay. When it came back, the air wasn’t that much cooler than the room, the condenser was only putting out lukewarm air, and the drain line was spitting out some ice cold water.

System was cleaned 3 weeks ago. Time to panic?

Also, it’s a 4.5 ton system on a 3 level house, so I know it ain’t enough power.

Nest

It’s a nest. Service tech is convinced it’s bad wire. He changed several elect components after what we think was power surge or lightning. 24v power supply, relay etc.
If you disconnect signal wire outside and reconnect it comes on and cools.

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It’s a nest. Service tech is convinced it’s bad wire. He changed several elect components after what we think was power surge or lightning. 24v power supply, relay etc. If you disconnect signal wire outside and reconnect it comes on and cools.

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If you follow professional HVAC forums where HO questions are answered by experienced HVAC techs, NEST thermostats have a bad reputation and are known to cause issues that in many instances that can be fixed by changing the thermostat to a Honeywell or Ecobee. You might be better served in the long run in replacing your thermostat to a more reliable brand regardless what the problem might be with your unit.

LINK

Your techs comment on power surge is also a good reminder it might be a good idea to put a surge protector on the outdoor condensing unit, not complicated or overly expensive. I had one installed with my HVAC changeout this past Feb. In addition I added a whole house surge protector which will help protect the furnace and other electronics in the house with power surges, brownouts, etc. (refrigerator, washer/dryer, dishwasher, etc. - everything has a circuit board nowadays).