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I have an Ariston Clas He system with an error code of 1P2?

When running a Hotwater Tap the error 101 shows and the boiler shuts down with the red light showing.
Pressing the Reset button shows the error code 1P2.
Sean, April 2017
This is related to a circulation issue, could be the pump or a restriction on your system such as sludge or limescale

dave8819, May 2017
link Click here to see other fixes for Ariston.