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I have an Ideal Isar m30100 combi gas Boiler. It stopped working An egineer called and replaced the Pcb got it working but stops after a few hours a green small line comes up on the display control but No error message ! this has been replaced along with the connecting wires and clips . Still have the same problem!!!

Posted by Anonymous on

  • Roger Jelinek Apr 07, 2011

    How long does it stay off? what do you do to get it to restart?

  • Anonymous Apr 09, 2011

    Hi , It will start as soon as you switch the power off and then on like a reboot !!
    It will run then for a few hours and then at some point it crashes ...
    no hot water or central heating !! Ideal tech line seem to be pulling at straws the engineer has done everything they have told him but no joy!!!
    thanks Richard...



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SOURCE: f20 error on vaillant eco28

F20 is a flow sensor error. Can be due to a defective sensor/ not correctly fitted, or you may have poor circulation, a big difference in flow and return temperatures, can sometimes make the boiler think it has a defective sensor, check good circulation through system, or if you have thermostatic radaiators valves on every single radiator, take 1 head off, as if you dont have a bypass fitted, it needs a radiator as a bypass circuit

Posted on Mar 03, 2009

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I hope this help you.

Posted on Mar 19, 2009

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SOURCE: Vaillant combi boiler problem

when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.

Posted on Mar 26, 2009

  • 1 Answer

SOURCE: We have a Worcester Bosch Highflow 400 (10 year

The by pass pipe may be limed up. This apparently causes a reduced flow which will stop the heating side of the thing working. Call out Worcester Bosch engineer. It costs £210 including VAT and most parts and they almost guarantee to get it working.

Posted on Dec 02, 2009

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SOURCE: Hi I have a ideal isar 30100 combi boiler which

jumper links not inserted in to pcb is h5 code

Posted on Mar 21, 2010

Testimonial: "Hi mylandlord eventually sussed it out and blanked of port1 and 3 on the pcb thanks for your help T"

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