Gas hob going out

Discussion in 'Tech/Mech General' started by deanroofing, Mar 3, 2012.

  1. deanroofing

    deanroofing Funster

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    Hi Guys,

    Got a problem with my gas hob, keeps going out on its own, it's a Thetford Spinflo, on a Gaslow system our blown gas which is a Truma Combi is working fine, any ideas or solutions would be gratefully received.

    Thanks in advance.
     
  2. TheBig1

    TheBig1 Funster Life Member

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    sounds like the flame failure device cutting it off if the pressure is ok. This relies on a thermocouple that gets heated by the gas flame to keep the valve open. If for whatever reason the thermocouple is not being kept hot, the gas will shut off

    check that the thermocouple has not been dislodged when cleaning the hob and that you havent got a draft across it from an open window
     
  3. wasp

    wasp Funster

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    Have you tried all the burners on the hob, I can understand thermocouple failure on one but not on all of them, there may also be a bit of muck in the jet:thumb:
     
  4. TheBig1

    TheBig1 Funster Life Member

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    If its a blocked jet, this will give a weak flame, so not heating the thermocouple correctly


    Mind you, we recently had a similar issue with the hob flame dropping by itself over time. Turned out to be a failing truma gas regulator, which couldnt keep up the supply.. In the end, it failed totally resulting in no gas getting through. Replaced it and sorted the problem, also fridge lights faster on gas than before
     
  5. deanroofing

    deanroofing Funster

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    Tried all the hobs one did stay on a bit longer than the rest,when they go off it does seem like there is a cut off makes a noise, just tried again one stayed on for about 15-20 seconds the other two go out as soon as you release the knob.

    Don't know if that gives any ideas, flame seems fierce enough on all burners.
     
  6. TYKETRIPPER

    TYKETRIPPER Read Only Funster

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  7. TheBig1

    TheBig1 Funster Life Member

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    if the flame is fierce as you say, then it should heat the thermocouple. generally there is one for each burner. Another thought is air in the gas pipe. If you recently had work done on the gas or changed cylinders etc, it may be as simple as relighting the hob several times or holding in the knob to purge any air

    The mechanical noise you describe is the flame failure device in the valve cutting off the gas as it failed to detect a flame
     
  8. pappajohn

    pappajohn Funster Life Member

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    i reckon that eliminates the regulator :thumb:
     
  9. deanroofing

    deanroofing Funster

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    Got the stainless hoses, so thats not the problem, perhaps is the thermocouplers have to get my mate to have a look.

    Thanks guys.
     
  10. pappajohn

    pappajohn Funster Life Member

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    if the flame continues to burn with the knob held in then its almost certainly the thermocouple.

    holding the knob in by-passes the thermo to allow it to heat up.
     
  11. TYKETRIPPER

    TYKETRIPPER Read Only Funster

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    Then just use it as info:Wink:
     
  12. C.L.S

    C.L.S Trader - Service & Repairs

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    Sounds very much like your shut off switch is failing , I have replaced several of these under warranty for Thetford. Your dealer should be able to sort out for you and takes around 1 hour to undertake,
    Thetford Part No. SSPA0600

    Mark
     
  13. TheBig1

    TheBig1 Funster Life Member

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    That makes complete sense of course :thumb:
     
  14. jhorsf

    jhorsf Read Only Funster

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    Just a thought but some that have a glass cover have a valve that opens to let the gas through only when the cover is up could it be be this playing up ?
     
  15. Reallyretired

    Reallyretired Funster

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    I have the same problem. Johns Cross think it may just need the thermocouples tightening. It is going in to them on the 13th so they can play with it. I don't fiddle with the gas myself.
     
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