Unfortunately, if the transformer failed on an ASCO 108D10C, you will need to replace the whole unit of the Gas valve relay panel.
For more information, see the link below:
https://asco-power.cld.bz/ASCO-Power-Technologies-Products-Digital-Binder/356/
To contact sales, see the link below:
https://www.ascopower.com/us/en/services-and-support/contact-us/sales.jsp
Published for:ASCO Power Technologies USA