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Irrigation/Hunter Pro-C Transformer Running Hot


I had a Hunter Pro-C installed with 12 zones about five years ago. The system performed well until recently when I noticed that the display said "No AC".  I put a volt meter on the power side and then on the controller side of the transformer and noted the transformer was getting power but the controller side was dead.  I replaced the transformer and restored power and noted that the display still said "No AC".  I contacted the company I purchased the transformer from and they told me it was probably an issue with the Pro-C itself that shorted out the new transformer.  I purchased a new Pro-C and connected everything up and the system started working, however when I checked the transformer later I noted that it was pretty hot.  Is this normal?  I turned it off until I can figure out if this is ok.  I understand that transformers will get hot, but this one is almost too hot to touch for more than 3-4 seconds.


I have noticed transformers running hot before too. Both when there was an issue and also where they have run hot for years without issue.  So my opinion is only that.  Call Hunter tech support for further assistance 760.591.7383

Best of luck



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Robert Diersing


I am able to answer any questions related to lawn irrigation systems and backflow devices. But pumps are not my speciality since they are not common in my area. Most of my product experience is in Hunter, Rainbird and Irritrol components.


I have been in the Irrigation Industry since 1998 with experience in everything from residential to athletic fields, commercial, industrial to complete Hospital campuses

Irrigation Association

I have been quoted in trade magazine articles.

Kent State University 12 CEU's per a year in Industry related classes

Awards and Honors
Irrigation Association Certifications: Certified Irrigation Contractor State of Florida Licensed Irrigation Contractor State of Florida Certified Backflow Tester State of Ohio Certified Backflow Tester EPA WaterSense Partner

Past/Present Clients
Hospitals, School Districts, National Franchises, Government Agencies

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