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Does anyone know what H9/L9 fault code on ideal isar HE24 is?

Does anyone know what H9/L9 fault code on ideal isar HE24 is?
tom, February 2010
Fab thank you our Ideal boiler was flashing H9 I have changed the pressure and the boiler is now working. Many thanks for the help.

Carrie, April 2018
overheat fault, check the pressure gauge on the bottom left hand side under the boiler the pressure should be around 1-1.5 bar. could also be the pump or the dry fire stat.

Brucey, February 2010
link Click here to see other fixes for Ideal HE24.