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you have lost power to the furnace or boiler. Do you have a "top of the stair switch" usually entrance to basement or attic that someone may have shut off?
I should also say Air Handling unit if Heat pump......
let me know if you have checked this, and we can go further if needed.
I'm almost convinced we have lost power. I would suspect this A/H being 120V, the outdoor unit is 230V, so it is a separate breaker. The zone panel and controls may be on a separate transformer. can you give me the model number of the zone control panel, and maybe even take a picture of inside with the cover removed, maybe we can narrow it down.
no problem, will be here...
on your second picture, you have a cover removed to the left? is that the blower motor section?
there is most likely a "door switch" on that panel. You must have that panel on or manually activate the door switch to test.....
can you take a picture a little further out on the left side of the air handler, I may be able to see it. It's a little piece of plastic, that the door press's up against, and closes a a switch. you probably won't see wires to it, because it is behind a flange. but if you have the door panel off, unless it has been jumped, it will not close, and also may kill power to the zone board. It should not be wired this way, but good installations are not always the case...... need to cover all the bases... if you know what I mean.
ok, great, now, we need to take a picture of the inside of the zone panel board, does the power get supplied to the zone powered board from that transformer your showing in the picture.?
please check wire # ***** from left, red wire feeding RH on terminal board. Make sure this wire is firmly seated in panel.
in picture 20160124_121, please check brn and black wire feeding (red labeled 24V power).
ok let me know how you make out......... if you know how to use and have a voltmeter that would be great, if you don't have one, home depot or one of the other "big box stores" sells them pretty reasonable. that would be very helpful for you problem.
please feel free to rate the service so far, and I will be here to help you in the future for the same problem.