Nice work. Wire connectors are fine. Depending on your model controller, or year (if not this exact model) it could different. Perhaps the transformer was replaced at some point in the past.

Interesting. Definitely not normal for a transformer to be bad out of the box. Silly question, did you check the incoming power? Perhaps the GFI is tripped, etc., or the power is high and it blew the new transformer. Use a multimeter and test power going into the transformer and out of the transformer

Correct, NO AC means the controller panel is not receiving power. To diagnose this as a transformer issue, you should check the voltage coming directly out of the transformer using a multimeter, you should see something between 24-29v. If it is 0v, this will tell you the transformer has failed. If there is voltage, then the problem is somewhere else, like the ribbon cable, circuit board, face panel, etc. If you don't have a multimeter, you can use a solenoid and tap the solenoid wires to the transformer wires, and you should feel it activate. Or, a multimeter at the hardware is about $15-25.

@@Andy_Humphrey thank you!

Yes, they can be hot. Hot can be hard to measure/describe, so keep an eye on it. Is your system a new or existing, and if so, how old is it? Not that it has anything to do with being hot, just curious.

@@Andy_Humphrey Brand new, landscaping company is replacing it. Couldn't even put a finger on it

It would be a good idea to have them check for field wiring problems which might be the source of the transformer issue. Check the voltage in/out of the transformer, check the current draw when in operation and Ohm out each solenoid. Good luck!

@@Andy_Humphrey Thank you, the wattage was checked but came out at 27 on the transformer, so all being replaced today, appreciate the replies

Are there screws on the compartment? Unfortunately, I don't have a unit in my office to look at. Made a quick video for you: www.loom.com/share/028244d46c1d4ff1a74014ed15e3cbe8?sid=dc8cc959-eb54-492d-8777-9cb3b10aaa6f

Great question. I believe this is to simplify the installation, etc. 1:13 The controller use AC power and therefore the wires can be installed on either screw terminal so there is no need to have 2 colors, which typically designates (+) or (-) and specific installation terminals.

Thanks for your reply. My old transformer is then bad because I am only getting a couple of dc volts between the 2 yellows.

Correct. Just for good measure, check the power going into the transformer if you haven’t already. Just to rule out a bad power source, cord, GFCI outlet, etc etc.