Urgent-No Hot Water

Discussion in 'Tankless Water Heater Forum' started by rbeny10, Mar 3, 2012.

  1. rbeny10

    rbeny10 New Member

    Joined:
    Feb 29, 2012
    Location:
    Israel
    :mad:1. The following sittuation is for 2 WK,so pls' HELP,before I'm thrown out with the Water Heater.

    2. Tech. details :
    - TYPE: WT14, by JUNKERS ,Model-2005(Wasn't used all the time=>looks new!!!)).
    - It works on Butane Gas (E31 Sub-model.
    - Its full automatic.
    -The problem: After a couple of min. of work, It shuts-down automatclly.No hot water.RED bulb lightens.
    -Suspichious: Becouse,while working,the temp. increases without limit, possiibly: The security cut-off circuit is provoked ,becouse of excesive temp.
    -Diagnostics done: a) Checking the resistance of the Temp variring Potentiometer (in front of the Heater panel), couses NO RESISTANCE CHANGE(constant 16Koham)!!???Since I dont't have the schem. I can't conclude if its a bug!.
    b) Chek of HOT WATER NTC RESIS.: I'm confident its O.K.
    c)Check Voltage of Temperature Limiter /Temp. control (Both names appear in the Appliance Spec.),showes :4mv while the Heater works,dropping to 0v(absolute zero),when jumping into cut-off.
    d)Check of Presostat: O.K.
    e)Visual and Sut-down tests: O.K.
    f)Gas pressure:O.K (gange of old central gas flow cont,from 7liter/Hr to 10 liter/Hr)

    My conclutions:1.The heater jumps into cut-off,bec. the hot water regulation circuit mailfunctions.
    The most suspicious circ. is the "Temp. control/limiter (i.e:4mv doesn'tlook to be normal,for correcr operation!???)
    2.The heat varing pot.malefunction: EVENTHOUGH THE bar shaft turens freely,mybe (but with 1% choice)its mechanicaly dissconnected gr. the pot. inner shaft=> doesn't affect it??.

    3.Any type of support(i.e.: Any schematics/Manual will be sized up.
    4. Any type of self experiance(even from other Gas Water heaters) will be sized up.
    5.Regarding the Manufecturer: So far I find-out the foll. link to Turkich dealer,but,he didn't reply to my mail!!
    :http://www.bosch.com.tr/content/language2/html/5232.htm

    Thanks-Beny
     
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