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I looked at the schematic. There is an error in it. They show the black wire going from the right side of the timer to the bottom part of the transformer. That shouldn't be. The white wire should connect to that part of the transformer. Otherwise the fan would be in series with the transformer primary as they have it shown. Unless they have other errors in the diagram. Take your meter in the AC voltage mode and check the voltage on the output side of the transformer winding end to winding end. Then check the voltage from each end to the center tap on the transformer. It should be 1/2 of what the end to end voltage was. If you have no ac voltage here then the problem is in the primary side.
If you do have ac voltage there, put the meter on DC and check between the center tap and the input to the circuit DC breaker. Follow on to the ammeter etc. Make the same kind of measurements on the primary side in the AC mode with the meter. One lead on the black wire where it connects to the timer and the other lead on the wire where it connects to the lower transformer switch. If you have voltage there then leave the test lead on the lower transformer switch and move the other one to the output lead of the timer, which will be the junction where the fan lead hooks and the circuit breaker hooks to. If you have voltage there then move that lead to the other side of the circuit breaker. If you have voltage there you should have it at the transformer unless one of the switches is bad. The transformer may be open if nothing there. Be carefull! Don't get zapped. Let us know what you find. Regards
Gary
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