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Attempting To Connect Ecobee 3 With Taco Zone Board And Air Handler

The air handler electronics are all but inaccessible due to the handler being installed in a knee wall and facing away from the room. I have a Taco 3 zone control board connected to a 2 zone radiant system for heat. Ecobee tech support is telling me I cannot install this thermostat without access to the air handler for the C wire connection. Is this correct? If so is there another option or another brand without this limitation? Thanks.

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