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High limit stat open.
Supply temperature too high. Caused by
-Presence of air
-Possible polluted impeller of the circulation boiler pump
-Polluted internal filter
Check de-aerator. Replace when necessary the automatic de-aerator and restart boiler for de-aerating programm (17min.)
Check water fl ow over system. Clean when necessary the pump and or filter. Flush complete system
Check adjustment of balancing valves
