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Hello, first time going to Reddit for help. Long story short, moved into home one week ago and replaced thermostat with Nest Learning Thermostat. Worked for about a day and got alert that there was no power to Rh wire. Pulled thermostat off wall, checked wires, reinstalled and it worked again. Last few days have been mild so haven't need AC much. Ran the AC about 20min the other night. Now, I got the alert for no power to Rh wire again. Went through troubleshooting again can't solve the issue. Did some Internet digging and found it could be a clogged AC drain line, or a bad moisture switch. Now my dilemma, I cannot find my exterior AC condensation drip line to vacuum out. I only see access at my furnace (see pics). Can I vacuum out from my vent line access? Seems counterintuitive to vacuum against gravity. Secondly, the moisture switch light is on, indicating moisture detected. I removed the moisture switch and very little water comes out of the line along with some sediment, so not sure why it's tripping? Could it be a bad switch? I disconnect the switch and the power to the Rh wire is restored at the thermostat, but this feels unsate to keep permanently as I don't want a clog, back up and water damage. House was just remodeled. Any help?
Looks like a drain issue. You can snake it like a sink, and it should connect to a drain, drain pipe, or pump. If it's a drain or drain pipe a plumber might be required. Treat like a clogged sink. If you have a pump check it's works good. If not replace. (Little giant makes. $50-$60 that works well.)
It is recommended to have a working drain line and water sensor to keep from getting water damage.
Feel free to take more pictures of where that pve pipe runs too. Looks like it runs into wall. So probably connected to drain pipe.
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Definitely sounds like you need a plumber. To get the draining issue fixed so you can use the AC without overflowing.
Depending on the type of water sensor it could be misreading the situation. It sounds like it was working at less water. So fingers crossed it just messes up after over flooding. Probably best to get replaced after drain issue is resolved.