While testing the voltage at a 24v inducer relay, I accidentally touched one of the probes to a live 120v terminal, creating a spark. (I'm pretty sure the other probe was touching the neutral 24v terminal.) After that, the 24-volt reading went to zero. The 120v circulator motor is controlled by the same 24v system, and is still working fine. Is it possible to fry only PART of the 24v control system?

(Slant Fin Victory 150 boiler)

Kent, February 2010