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On the 24vac side, this would include any load attached or powered by the transformer. A wire than has gone to ground (shorted), or rubbed into the ductwork (stat wire). The transformer will be rated at xxva, meaning volts X amps aka(watts). Most residential equip. will have a 40va fitted. 40 / 24= 1.66 amps. Any load in excess of this should cause a failure. If you are trying to fix this yourself, put a 2amp automotive fuse in series with one of the 24vac "out" leads and go one by one, isolating the gas valve, wiring to the thermostat, etc, till the fuse quits blowing. Otherwise, call a tech. lc

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