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the zone control will connect a relay to furnace when calling...it uses the furnace power and not the zone power.
At the equipment terminals...if you have 24v at R and C.....and then at thermostat terminals (in zone panel) you vac 24v at W and C...and furnace does not work.....then you have a bad panel.
do you have any extra wires in the cable?
And did you have 24 volts at C and W?
at the zone panel with a call for heat..
at the equipment terminals. Measure C to W.
THEN if 24v is at zone panel C to W.....tell me if there is 24v at ffurnace circuit board C to W
Well, lets start at hot wire.....when light is lit....is there 24v R to C on equipment terminals in zone panel
ok lets clarify...there are termials R and C for power to the board...this runs the thermostats.
Then we have 24v delivered by the equipment..but this is at the equipment terminals (wires from furnace)
Which R terminal are you reading the 24v on?
if you take a paper clip shaped in a U.....and at equipment terminals you hold one end on R and other on W...does exhaust fan start in furnace?
so gas is first stage with electric duct heater as second stage or emergency?
And does r to w2 start gas furnace?
ok , if the issue remained after replacing panel we have a breach in the gas wire...we know the R is Good and electric heat wire...r to g should start fan/blower.
we need to trace the thermostat wire that goes to W terminal in gas furnace and see if a bad wire nut, optional safety etc is between the furnace and zone panel