I think I have blown the boiler !!! Help

Discussion in 'Tech/Mech General' started by Laura F, Jul 14, 2016.

  1. Laura F

    Laura F Funster

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    hi all,

    We bought are fist van 2 days ago, we got it with a boiler problem we had it air and no hot water.

    It's a 1996 Hymer B544 on a fiat, it's a really clean fan.

    Well I am a right rolls your sleavs up and get in there type girl and put some men to shame. So I set about fixing the boiler.

    1. I bleed the lot down and dumped the water.

    2. Filled the system back up (with hot taps open)

    3. The top half of the auto dump literally pop off and spayed water all over the boiler.

    4. Left for a cuple hours to dry.

    5. Intermittent sold and flashing lights

    6. No power to control

    7. Changed 2 blown glass fuse's on the circuit board.

    8. Checked 5amp fuse in the passages side door panel.

    9. Still no power

    Have I fried it to death ????

    Help Laura X
     
  2. DavidG58

    DavidG58 Funster

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    Hello again

    Some photos are always useful, especially of your exploding dump valve

    Model details as much as you can and a photo of controller maybe

    But to be brutal it always looked like you might need some money spending on mending or buying a new heater unit from your descriptions yesterday

    But there is still some hope it is something more simple (y)
     
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  3. Laura F

    Laura F Funster

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    It's a Truma C3400, dose any one know where there could be any more fuse's other than the 3 on the main board ?
     
  4. Laura F

    Laura F Funster

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    ?
     

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  5. Laura F

    Laura F Funster

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  6. Laura F

    Laura F Funster

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  7. chaser

    chaser Funster

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    Can you get a direct feed to the boiler to see if it is working, before getting panels to bits and stuff that you might not have to do(y)
     
  8. Laura F

    Laura F Funster

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  9. Laura F

    Laura F Funster

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  10. Terry

    Terry Funster

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    Chances are low 12v feed wire it direct --As @chaser SAYS WHILE TYPING
     
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  11. Laura F

    Laura F Funster

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    Ok may have time to do that later X
     
  12. Laura F

    Laura F Funster

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    As you know I new to all this, by direct feed do you mean crate a direct temporary feed between the boiler and the battery or hook the van up to the house ? sorry I am a bit slow X
     
  13. seanoo

    seanoo Funster

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    find a working 12v source near to the boiler and run a feed from there to your boiler to see if it works.
     
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  14. chaser

    chaser Funster

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    I wouldn't get involved with mains electric till you have found a bit more about it, in fact you don't need mains , if it is working on 12 volt that's good enough, we have the same boiler as that and have never used it on mains except to see if it worked.
     
  15. Terry

    Terry Funster

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    Hi take a temp feed from battery to boiler then try it thus eliminate any shorts etc to boiler
    Terry
     
  16. autorouter

    autorouter Funster

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    First, see if the water flows. If it's a completely unknown fault then it could be frost damage. The top popping off the dump valve is the kind of thing caused by frost.

    If you can't get water to fill up the boiler and flow out of the hot and cold taps, then hunting for faults on the control board won't help.

    The auto dump valve is designed to prevent frost damage by dumping all the water if the temperature goes below about 8 degrees C.

    Some people, me included, will jam the auto dump valve closed if it's set to go below 8 but is unlikely to actually freeze. Then it could have been forgotten and the whole thing froze.

    I've not seen that exact dump valve before, so I don't know how you could fix it in the closed position. If all else fails you could undo the hose clips, remove the dump valve and put in a hose connector - as a very temporary measure in the fault-finding process.
     
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  17. Wagoneer

    Wagoneer Funster

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    The basic boiler unit works on 12volt - forget about 240volt.

    There was, however, an optional extra for this boiler where you could fit a jacket around the boiler - this jacket had a heating element and was powered from 240volt. Perhaps this is what Chaser has on his boiler. The jacket was purely for heating water when on 240volt hook-up and not for space heating.
     
  18. Wagoneer

    Wagoneer Funster

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    Do you have an instruction manual for your boiler ? There is a fault finding section at the end. If you don't have, you should be able to download these from the Truma website.

    If you have a flashing red light the most likely faults are:
    1) no gas getting to boiler
    2) faulty auto ignition
    3) faulty burner unit
    4) faulty gas cut-off valve
    5) faulty PCB (printed circuit board)
    6) blown fuse or fuses on PCB

    As far as I know, the electrics to the dump valve are not monitored at the PCB - so will not be the cause of a flashing red light.

    I assume you have the gas turned on and the internal gas isolation valves also turned on (usually located under the kitchen area).

    Does the space heating work - you haven't mentioned this ?
     
  19. chaser

    chaser Funster

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    This is what I can't understand, there's been no mention of gas up to yet, the electric is only to get the gas lit, and 240v is a different element altogether, does the op think the 12 volt is heating the water?
     
  20. Wagoneer

    Wagoneer Funster

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    Agree with @autorouter - purchase a male and female garden hose type connector and bypass the dump valve (temporarily).

    OR, purchase a manual dump valve (as already mentioned by the OP) providing the OP remembers to open the dump valve to drain the boiler when temperatures drop to freezing. If camping in sub-zero temperatures with the boiler on heating mode, then nothing to worry about.

    I too, haven't seen the particular dump valve shown in the pics. The version on my 2002 van (with the same boiler) had a vertical red plunger with mushroom shaped top. Pull it up to close the dump valve. AND (if necessary), insert a clothes peg to stop it opening at temps less than 8C, happy times, haha!!!

    On my Hymer there were a couple of stopcocks in the floor of the kitchen cabinet to drain down the kitchen and bathroom taps. These obviously need to be in the closed position during the summer months.
     
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