u/cardboard-tuber

2 Zone Mini Split Cooling Issues -- Need Help Troubleshooting

2 Zone Mini Split Cooling Issues -- Need Help Troubleshooting

I have a Tosot 2 Zone Mini split I installed in the fall. All through the winter the heating worked great in both zones. Now that it's getting hotter the cooling is not working out.

Zone 1 gets super cold very quickly, and then zone 2 doesn't get cold at all. Even when zone 1 is off and zone 2 is blasting, the head in zone 1 freezes over instead of the coolant going to the other zone.

What are some things I can do to troubleshoot this issue? The filters are clear, the drain hoses are unobstructed, and the connections are tight. I'm planning on re-flaring the ends and reassembling it, but I'm not sure if that's the right way to go about it.

Here's an image of the zone 1 head after the zone 2 has been blasting at high for an hour while zone 1 is off.

EDIT: Solved! The communications wires were swapped. After fixing the issue it's cooling no problem!

https://preview.redd.it/6v5yq7q0hk0h1.jpg?width=4080&format=pjpg&auto=webp&s=9b91398dc6f4df14f91baea0f6823afb8f957181

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u/cardboard-tuber — 3 days ago