Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Open limit error, bypasses limit, same issue

Installed a ST9120B,U replacing a ST9160B1084. The old controller wasn't supplying power to the SmartValve. The new controller does. Now I'm getting a Limit Open Error. Bypassed all three limits, same errror code. Any suggestions?

Comments