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  1. W

    isar boiler fault L9 plus three horizontal lines

    the system was initially too high and you could hear the safety valve blowing off, and it states this would happen at 3 bar.
  2. W

    isar boiler fault L9 plus three horizontal lines

    what would cause the pump to slow down?
  3. W

    isar boiler fault L9 plus three horizontal lines

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  4. W

    isar boiler fault L9 plus three horizontal lines

    the pressure is only set to 1.5 bar.
  5. W

    isar boiler fault L9 plus three horizontal lines

    I have read most of the faults mentioned in this forum and my isar fault is linked, I think. We get the system working hot water & and radiators for a couple of hours but then you ear a noise (air) in the boiler, the pressure gauge moves up and down - the water coming through then gets very hot...
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