Lot’s of idea’s. Why did you replace the controller? Did you do any testing before replacing it? I suspect that you have a 10 second cycle going on. That means you probably have a bad RTD. Also be sure that when you replaced the controller the polarity of the RTD was installed correctly. Be aware that the mounting of this sensor into the plate requires a heat sink compound during the install. Follow this in the service manual here; https://www.partstown.com/modelManual/VH-RRG-SERIES_sm.pdf
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