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Ravenheat intermittent hot water

Discussion in 'Plumbing and Central Heating' started by dan12345, 2 Jan 2011.

  1. dan12345

    dan12345

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    I've got an he85t ravenheat combi. It's been fine for about 3 yrs but has recently started to run a luke warm bath. I took a look at it while the tap was running and it seems the boiler fires up for 15-30 secs, then goes out, then fires up again for 15 to 30secs or so. The result is a luke warm bath cos it's not heated all of the water.

    CH is fine, luckily!!

    Any ideas? Thermistor maybe?

    Thanks.[/b]
     
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  3. landyandy

    landyandy

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    Possibly the diverter valve.

    Andy.
     
  4. dan12345

    dan12345

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    Thanks Andy, is that towards the bottom of the bolier with a series of bolts around it's outer edge? I've also just noticed that there's a very very slow drip coming from this part too..?
     
  5. landyandy

    landyandy

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    Thats sounds like the one.
     
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  7. Marc86

    Marc86

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    Id be checking thermistors first, not sure why the diverter valve would make the burner heat up for 15-30 seconds?
     
  8. dan12345

    dan12345

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    Hi Marc, I went with the advice of a friend who had a similar problem and replaced the diverter at a cost of £50. Well I still have the same problem!! Would you mind explaining which thermistors I should try replacing please? I'm hoping they're cheaper than the diverter!!

    Thanks.
     
  9. combispecialist

    combispecialist

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    check thermistors yeah but what uve said indicates a blocked plate/plate h-exchanger
     
  10. dan12345

    dan12345

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    I also get lots of noise from the rad which I think is closest to the boiler after the hot tap has been turned off. The noise sounds like air (maybe?!) and stops about 10-15 seconds after the hot tap has been turned off..
     
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