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There is a switch on the condensate tank not a Square D. The boiler feed pumps are controlled by something on the boiler which is not in the pictures.

our standing radiator has 7 ribs with a length of 15 in and depth of around 8in and height of around 36in

@JH3550 You could PM @Mad Dog_2 or @JohnNY if they can't do it they may know someone that will. You could clean it up yourself if your handy, but it is kind of a dirty thankless job.

@delcrossv you can buy a #2 switch for a 67 without the float.

Low refrigerant charge…a leak.

Compressor cycling on OL or HP or LP

Leaking change over valve

Really any number of things.

Multi split with weird operation is almost always a low refrigerant issue. Check this before doing any other troubleshooting.

Those MM LWCOs should be stripped down annually.

Probably a bad switch, but those are sold with the float, so $$$.

Probably not the auto feeder if you tapped the low water cutoff. The low water cutoff needs to be taken apart and cleaned. The low water cutoff turns the water feeder on and off and the float is probably sticking. If you don't have it cleaned it could fail to shut the burner down in a low water condition ……and you do not want that.

You should have the LWCO serviced. In the meantime, keep water in the boiler by feeding it manually if you have a bypass piped around the water feeder. Can't tell by the pictures.

Keep your eye on the water level until you get it looked at.

The VTX feeders are better than the McDonnell Miller as @Jamie Hall mentioned.

Theoretically the autofeeder can be taken apart and the little solenoid valve which is sticking on you repaired. Theoretically. In practice it's usually easier to simply replace it — nice new VXT complete with useful delays and volume controls and a flow meter…