Our thermostat stopped working as there was no power on the Rc line. After a bit of investigation I discovered that the HVAC unit (Model number ARUF25B14AC) had water in the drip tray, which had caused the moisture sensor to switch things off.
I did a bit of research online and apparently this is usually due to the overflow pipe becoming clogged. This will make sense as we've not been running the unit due to cooler weather, but the attic where the HVAC is located is warm so it's a perfect environment for the pipe to become gunked up (damp and warm!).
The problem is that I'm having some trouble removing the overflow pipe to clean it.
I can move the pipes up and down a few inches which causes the light grey plastic to move in and out a bit. I can't unscrew the pipe bolts as it feels like I'll break something.
Do I need to loosen this fastener? If so what is this type of fastener, or the tool I need called?
Any tips appreciated. I'm close to calling a HVAC technician but I think I'm close to fixing the issue myself!
Update: I had a technician come around to take a look as I didn't want to start cutting things and causing more damage. They diagnosed the issue as being a tripped system which caused the unit outside to stop working problem, which resulted in condensation building up in the main unit inside. They reset and and repaired things and it's running fine now. I'll keep an eye on it though to make sure the overflow pipe doesn't start dripping again.
I'm a little skeptical about the tripping diagnosis as no one touched the thermostat in months as they insisted.