Your boiler is currently pausing its operation as a temporary safety measure to protect itself, and it should resume normal heating once the internal temperatures balance out.

DIY fix possible

Wait 15 to 30 minutes to see if the boiler automatically clears the message and resumes normal operation.Check that your heating controls and thermostats are not constantly demanding heat at maximum capacity.If the code persists, try restarting the boiler using its power switch or reset button.