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Gary - Help!


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My Truma water heater works fine on gas- no problems but on electric the water runs HOT! so hot that it comes out of the tap virtually boiling, very often triggers the safety cut out and has ruined 2 plastic tap heads by seperating the joints. Is there any way I can adjust the thermostat for it to run cooler on electric like you can with the gas control. Its a shame to have to run it on gas when youve paid up front for the electric.

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The thermostat is a fixed setting of 70degC on electric. Seems like the thermostat is faulty and not cutting out. If its still under warranty take it back.

 

Brian

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As far as I can find out there are two different elements, the older one has two separate little cube like thermostats attached to the tank and the later ones are built in.

It has been known for an old element to be fitted to a new system so has no temperature control, perhaps this is the problem?. It's more likely that the thermostat is not connected correctly to the pcb control board or firmly to the tank in the case of the older one.

On the old system the two stats are I think part of the same loom, as the overstat is working perhaps the normal one is duff.

Not my strength I am afraid and two guys I would ask are on hoilday!! but Tradetech should sort you out

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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Gary is right, there is a new heater to replace the older ones, as I have just had to replace mine. The new ones have the thermostat already attached to the element and fit on two posts on the tank. The element is bent downwards to allow a full tank of hot water, as opposed to the straight element which only effectively heated the top of the tank.

There is no adjustment of the set temp which is 70 degrees whilst using electric.

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  • 4 weeks later...

Anybody know why the hot water flows out of the overflow as much as the tap on my truma? When a tap is open the clear overflow pipe, which is on a tee piece along with the hot water outlet runs flat out. I can't understand why the overflow is at the same level as the hot outlet, I have turned the tee piece so that the overflow is slightly above the hot outlet but so much water flows out that I empty the aquaroll in about two fills of the sink!

 

I would appreciate tradetech or anyone else to advise.

 

Thanks

 

Colin

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. ..what overflow?? I have never seen one on a Truma system, there is a drain valve with a yellow lever to close it. ..you don't mean that do you?

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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. ..what overflow?? I have never seen one on a Truma system, there is a drain valve with a yellow lever to close it. ..you don't mean that do you?

21620[/snapback]

 

Our Truma Ultrastore has a ventilation hose fixed on the hot water flow from the cylinder and according to the fitting instructions this should point upward then a 11 mm hose is attached going in a curve ( of not less that 40mm radius ) to return downwards then through the floor of the van to 20 mm below and be cut off at an angle of 45 degrees to vehicle direction.

 

Is that what Colin is referring to?

Discovery 4 XS SDV6 and Airstream 532 plus 1996 MGF owned since new.

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Ted and Gary thanks for the repies.

 

No, it's not the drain v/v Gary. It sounds like the hose Ted is talking about. At the top of the tank a short spout leaves the cylinder. There is a tee piece on this spout and on one side of the tee is the red quick fit connection for the hot water hose. On the other side of this tee is a clear plastic hose which was level with the hot water hose. I have turned the tee piece round so that the clear ventilation/overflow hose is coming off the top of the tee, although it is now very close to the wooden seat slats, and the hot water hose off the bottom. I can't understand why the ventilation hose should be level with the hot water outlet, surely it should be above the outlet? Even with this pointing up, similar to what Ted describes, the hot water is pouring out this hose, and under the van. Perhaps I am missing something simple, but I had a look at another van with the same heater and the hot water/vent hose was connected in the same way although the van was in a dealers and therefore not filled with water to test. As mentioned in my first post, the water flow under the van is far superior to that through the tap! Perhaps I shold get washed under the van ;) Any help would be appreciated.

 

Thanks

 

fatcol

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I haven’t seen such a thing in a caravan before, but it does remind me of what is in an electric shower. In a shower there is an overpressure device which is a small membrane or sometimes a little plastic ball mounted in a side branch to the water outlet. In the event that the outlet is blocked and the pressure gets too high, the membrane pops (or the little ball is pushed out) and the hot water can the escape. If yours has blown for some reason (overheating, frost or an airlock perhaps) then it would just run & run. If this is the case, then you would need to get on to Truma for a new piece with the membrane in.

Anything that is complex is not useful and anything that is useful is simple

Михаи́л Тимофе́евич Кала́шников

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Ha Ha, mystery solved. Phoned Truma and the service guy was very helpful. We are all right! As Gary said there is no overflow, what the tube is, is actually an air intake that allows air into the tank when you drain it. There is a non return v/v in the tee piece that obviously lets air in but seats when filled with water to prevent the under caravan washing. All I need is the tee piece with internal nrv and I'm sorted.

 

Thanks all for your help. (Of course I could have phoned Truma in the first place but this has been more fun and may help others with the same problem).

 

Cheers

 

fatcol

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