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Hi all,

Like most people we just used ou  van for the first time this year however we had a problem with the truma water heater. It worked on gas ok but when we switched to electric it tripped our internal switch and the external trip switch on the hook up every time Help please?  

Sounds like your heating element has blown .
Have a look here Truma Ultrastore 2 Heating Element

atb

Wizard

agree 9 out of 10 times if its blowing fuses the element has gone.

 http://www.leisureshopdirect.com/caravan/water/truma_heaters/Truma_Ultrastore_Water_Heaters__Spare_Parts.aspx

from metz post

, it's a straight forward job, make sure the power supply is isolated, open up the star shaped pressing aroun the element, remove the locking nuts that secure the  element, make sure when you remove it that you get the rubber seal out, refit in reverse making sure you get the rubber seal in the correct position (always use the new one provided), This is the important bit DO NOT OVERTIGHTEN the lock nuts, to tight and you will snap of the captive bolt, (you don't want to be doing that), remake  the electrical connections and test.