Water (hot) not working

Discussion in 'The Beginner' started by Brightonian, Feb 21, 2016.

  1. Brightonian

    Brightonian Funster

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    Hi all,

    Thought i would test out my water heater in van today, filled tank, turned pump on and water comes out of both cold taps but nothing out of hot taps.
    When i only turn hot taps on i can hear the pump wanting to pump (makes a noise about every 3 seconds) but when i turn only cold taps on pump works fine and water flows.
    I'm guessing i have air in the hot water boiler so i left taps on and let water flow out at same time as filling tank i also opened air valve on boiler and after this it worked for a minute or so.Then nothing.

    Any thoughts on fix

    Cheers Pete

    PS. I did not turn on boiler as wanted to be sure water had reach it.
     
  2. etap

    etap

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    I presume the hot water tank is full, and the winter drain plug is not open.
    Just a thought.
     
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  3. sweetie

    sweetie Funster

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    You need to open hot taps to fill the boiler, when water starts flowing and no air boiler will be full
     
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  4. Brightonian

    Brightonian Funster

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    Drain plug is shut but because of air don't think hot water tank is full.

    I did leave taps on for a couple of minutes should i leave them on for longer?
     
  5. rangitira

    rangitira Funster

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    Takes in the region of 11 or so litres to fill the HWTank

    on mine anyway
     
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  6. PeteH

    PeteH Funster

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    Most Boilers can contain anything up to 6 gallon. So it takes several minutes with the HOT taps open for air to vent and water to appear. However It occurs to me? Is it an American?. A large number of which have a winterising system that allows the HOT Water Boiler to be bypassed? usually consisting of 2way Taps (Cocks) near the boiler. 1 Closes the inlet 2closes the outlet 3 links the inlet to the outlet bypassing the boiler.

    Just a thought?

    Pete
     
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  7. Brightonian

    Brightonian Funster

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    Not American It's a 1999 Bessacarr E600.
    Going to go into van now and try letting it run for several minutes, will let you know soon.
    Cheers Pete
     
  8. Badknee

    Badknee Funster

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    Hmmmm, if the pump runs a little then stops, then runs again then stops it is reaching pressure somewhere. So thinking it through, on cold pumps water through pipes ok. On hot pumps water into boiler, compresses air in there and stops. Air pressure drops and pump starts again. Sound about right? Just leave pump running and taps open but make sure main tank full. (y)
     
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  9. pigginchilli

    pigginchilli Read Only Funster

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    Just had very similar problems, dont open the cold taps just the hot one at the sink, dont turn on gas or electric heater till you have a good flow of water, is it a carver cascade water heater?
     
  10. PeteH

    PeteH Funster

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  11. Brightonian

    Brightonian Funster

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    Been on now for a good 20 mins just a drizzle coming out of hot tap.
     
  12. Brightonian

    Brightonian Funster

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    Pump sound is now more frequent but still just a drizzle. Will turn it off for 5 minutes then try again
     
  13. Brightonian

    Brightonian Funster

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    Yes it's a carver cascade water heater

    PS Where would a isolating valve be and what would it look like?
     
  14. PeteH

    PeteH Funster

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    Hi

    Look at http://www.bessacarr-owners-club.or...motorhome/9830014-MH-Owners-Handbook-2000.pdf

    Scroll to Page either 17 or 20 thereabouts and look at the Water system layout. IF a valve is fitted it will likely be between the TEE piece following the Pump and the heater itself.

    Can I ask if the HOT water system has worked in your ownership?. Because IF not then the issue MIGHT be GROSS scale in the heater tank itself blocking the inlet to the the heater.

    Pete
     
  15. Brightonian

    Brightonian Funster

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    Yes have had van for 8 years now, had a problem 2 years ago with a hose coming lose, got that fixed.
    It worked fine last year on holiday.
    Drained tank beginning winter. Thought i would fill tank and test it yesterday and it's not working as it should!
    I will give it another go tonight when i'm home from work.
     
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  16. DanielFord

    DanielFord Funster

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    OK so your van is extremely similar to ours.

    Assuming you have a u-shaped lounge, stand in the middle and look backwards. The boiler is under the rear left sofa, lift that cushion. On the floor under it there is a yellow flip valve just in front of the boiler attached to the pipe, it should be flat, not upright.
    Since it sounds like you have no water in the boiler, make sure the water heater is off (switch on the Sargent), that only matters if you are hooked up by the way.
    OK now the stuff we do do un-winterise! To get water through after a water dump, first turn on the water pump on the panel, and wait until it stops priming. Set one of the mixer taps to halfway between hot and cold, the water running from cold will draw the air through, after the tap stops spluttering, move it all the way to hot. Repeat for all taps.
    When complete, your hot water should work, you may now switch the water heater back on :D
     
  17. PeteH

    PeteH Funster

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    Hope it`s now working?. If not I am afraid you have to consider something that happened to me with a very early cascade 2 in a caravan. I drained down at the end of a "season" come the new year, like yourself, I recommissioned the `van, including the Hot water system. and experienced a vastly reduced hot water flow. In the end it was a case of take it apart. (Some job that was!!). the shell was near 1/3rd full of lime-scale chippings. I managed to get a replacement shell, they where at that time still available at some cost (circa £155 as I remember) which came with a new element (bonus because mine had been "Gas Only"). Which after a right struggle getting it all re-assembled and installed restored full flow. The dealer who agented the replacement via Carver, said the caravan had very likely at sometime been used on a regular basis where the water content lime was very high, possible as a seasonal or "static".

    Best of luck hope it`s gone OK.

    Pete
     
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