Gas boiler transformer blown
When you checked the Xfrmr, did you check it with the wires still
connected to the secondary? If so, disconnect the load on the secondary
side and then check the voltage. There could have been a short on the
load side which brings the voltage to 0V.
If you still get 0v on the secondary, but you get 110V on the primary,
then the Xfrmr is probably gone.
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