Ideal Isar boiler H 3 problem

Discussion in 'Plumbing and Central Heating' started by mapka123, 11 Jan 2013.

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  1. mapka123

    mapka123

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    No central heating/hot water

    *Boiler sounds fine

    *Re-set button won't press (never has done)

    *Pressure was half a bar, released valve and its gone back up to 1 and a half

    *Burner light is ON

    *Status flashing H 3

    *No flow in one of the radiators (you can hear water in all others)

    Going to try bleeding the radiators

    Tried switching boiler off and on

    Thanks in advance for any suggestion's !
     
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  3. engineerman

    engineerman

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    dhw thermister needs replacing
     
  4. CBF

    CBF

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    or pcb
     
  5. WedgeAntillesRed2

    WedgeAntillesRed2

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    Definitely PCB issue. May as well replace the thermistor as per course as it will be out of calibration if boiler not serviced for 2 hrs minimum and cheap as chips. No brainer really.
    Every other Isar/ Icos I come across is PCB related. Maybe an expensive part but definitely cheaper than a new boiler.
    In an Ideal world ay?

    There's voices coming through my speakers
     
  6. plumbplumb

    plumbplumb

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    that makes sense
     
  7. CBF

    CBF

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    this makes no sense at all, so are you saying that if you spend two hrs servicing the boiler then the thermistor will be ok ? what has spending two hrs servicing got to do with anything ?
     
  8. Garfeild

    Garfeild

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    H3 is dhw sensor open curcuit or shorted,make double sure its piped up right way round as some (especially if its a warmfront install) werent.Remove the sensor,and youll get flooded.
    Although all should have been rectified by now.
     
  9. markymark1234567

    markymark1234567

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    Just change the DHW thermistor, nothing todo with the pcb. I have changed quite a few thermistors and never changed a PCB due to H3 fault.
     
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  11. CBF

    CBF

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    yes it's the cheapest thing to try, i've had some with the correct resistance but they are still faulty, however if this doesn't sort the prob then it's pcb so you saying it's nothing to do with pcb isn't correct
     
  12. joe-90

    joe-90

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    The PCB is a gas related part so the rules forbid you giving out this information.
     
  13. Murf520970

    Murf520970

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  14. bengasman

    bengasman

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    Virtually all parts in a boiler are gas related. :rolleyes:
     
  15. joe-90

    joe-90

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    Well why do you give info about some parts and not others? :rolleyes:
     
  16. Dan Robinson

    Dan Robinson

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    Why do you invent parts?
     
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  17. joe-90

    joe-90

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    Because I can.
     
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