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HTP Fire Tube Boiler overheating
We have an HTP flash heater MC-100 that is overheating.
I've posted a 1.5 min video of the control panel as the unit cycles.https://www.dropbox.com/s/cuakr4pa010f2xq/HTP Boiler Overheating.mov?dl=0
Not finding corresponding troubleshooting recommendations in the manual. Of course, if it's there, it probably reads "call a certified tech". But, we're sheltered in place a long ways from a tech.
Comments and recommendations appreciated