Kingham Truma Combi heater over heat problem

On holiday in north remote Scotland and our combi heater is showing a fault code [You must be registered and logged in to see this link.] (overheat)
Manual givrs instructions to let it cool down and press re-set button. 
The heater is under the bed at the back by the doors but cased in with an access hatch via the van's back doors which gets you to the drain tap but no re-set button.
 Hoping someone here  knows how to get to the heater re-set button????
If that doesnt sort it I should also check the fuses on the heater but again where are these?
The AS manual is no help!

[You must be registered and logged in to see this link.] can also indicate the 240V supply has been lost.
does setting the source to gas help?




If you really must reset the mechanical overheat protection, the procedure is on bottom of page 8 of the Truma Combi Operating Instructions (by Truma not AS). You need to remove the cover to expose the boiler unit (6 screws on my Warwick) and so it's not totally trivial. Remember which way the cover is fitted so you can get it back on

Thanks Don
I saw the diagram but my problem is the whole boiler is cased in a veneer clad box under the bed with only an access panel at one end and you cant see or get anywhere close to the plastic panel on top.
240v supply is working fine so clearly needs re-setting but cant get to the location in the diagram in your manual  which is also the diagram in mine!
Just wondered if anyone knew how AS expect us to re-set the overheat if its boxed in with no access!

Just off the top of my head, if you raise the bed, can you remove the top and / or side panels of the box to gain access?

I've never looked that closely so can't say for certain.

Tommy.

Re the heater fuse.

Section 3.2 (Page 7-18) of our manual suggests there's a Mini Circuit Breaker instead of a traditional fuse for the Water Heater (and other equipment) on the PSU (behind the flap on the front of the sofa).

Thanks Weegie... sadly its not that .. all the other equipment  (fridge etc are working.

Cant see any way of removing top.of casing under bed either.. find it hard to believe AS would design it so overheat trip.has to be accessed by destroying the casing..???. Think i will call AS....

To my mind, the veneer clad box you mention, is similar to what encases our leisure battery under the offside seating. The screws are disguised under 10mm round sticky patches matching the veneer so remove these to reveal the screw heads? Apologies if I'm completely off the mark.

Sadly no sticky patches or screws in sight!
Waiting on call back from AS

Snow 863, The top panel comes off. If you look closely you will see the sticky pads hiding the screws. They are blended in and hard to spot.

So if the water heater cuts out I have to empty out the under bed storage, crawl to the back of the bed space, prize out 16 glued in concealed fixing covers which dont go back afterwards, unscrew 16 screws to remove the boxing cover to access a re-set button?
Surely they would fit a little hinged panel like the one for the drain valve???
The access to reach it is so tight most of us middle aged/oap owners will do themselves an injury in the process... really not impressed if this is the case!!
Add to all this AS still havent called back as promised. The lady knew the problem and was getting someone to call me back to talk me through an alternative re-set method to crawling to the back of the under bed store.
Think I will do without hot water and hope they call in the morning!
Will report back in case anyone is interested.
Thanks for your help folks

snow863 wrote:
........Will report back in case anyone is interested..........

I hope you get sorted by AS, but yes please... report back, very interested as the information could prove vital at some point for us Kingham owners 

Will do Wagenwolf

The reset button in question is only for 240volt mains operation, if you let it cool it should work ok on gas if it is only the reset, also I purchased a fairford at the weekend and I noticed the shower compartment was getting very hot so I closed the vent, within 5 mins the boiler stopped and gave the overheat code I waited for it to cool and opened all vents agin and it worked ok for the next few hrs, IMO this Combi needs a lot of circulation and any restriction/closing of vents will cause it to overheat.
Has anybody else noticed any issues?

Attached pic showing top with 8 fixing screws and covers. Yes it is the only way to check the internal fuse and reset switch. [You must be registered and logged in to see this link.]

Had let it cool down a few times to see what happens. Sadly soon as I put it on to electric it goes to fault. All vents open  space heating not even on.
I am certain it over heated or fused yesterday as the main hook up tripped aswell.
Just find it unbelievable there is no easy access to it. Those sticky screw covers are not designed for regular access and there are 2 fuses and a re-set button under there!
We use the under bed storage for all sorts of stuff on a long trip and only way you can reach those screw covers is by moving it all out then squeezing in under to the bed to the back! We used to have a duetto and the water heater there tripped a few times when we owned it. Access to the re-set was so easy... just lifted off the little access hatch in the sofa seat base then lift off the heater cover plate and press the button.. job done. This is honestly really badly thought out if its the only way to the trip button!

Don't understand  why it needs to be boxed in like that. On the Kemerton XL you just lift the bench seat and all is there to see quite plainly 

Hope you get it sorted and soon.

Windy

If this is the only way I wont bother screwing it back down that is a promise!
Will face it tomorrow after speaking to AS. The lady I spoke to earlier was certain there is another way to deal with this, so I dont want to do my back in for no good reason!

Windychippy wrote:Don't understand  why it needs to be boxed in like that. On the Kemerton XL you just lift the bench seat and all is there to see quite plainly 

Hope you get it sorted and soon.

Windy

Same as our FB, lift up the bed to reveal the heater in all it's naked glory and so easy to approach from all sides. Perhaps best to try leaving the top of the boxed section off as it may improve the free flow of air to prevent overheating?

Paramedic wrote:
Perhaps best to try leaving the top of the boxed section off as it may improve the free flow of air to prevent overheating?

I think this is a good point.
Run this idea by AS when they phone and ask if there is any good reason for you to keep the cover.

Will do Don, we sleep on the bed... dont want to get cooked over night!

snow863 - Is it viable that once you've located the position of the reset switch, that you could cut a smaller hatch in the large cover and make a smaller removeable panel for future access ?

snow863 wrote:Will do Don, we sleep on the bed... dont want to get cooked over night!

On the underside of the slatted seat/bed we have a lightweight steel covering above the heater which acts as a heat sink for which my wife is eternally grateful on the colder nights 

AutoSleepy_Don wrote:

Paramedic wrote:
Perhaps best to try leaving the top of the boxed section off as it may improve the free flow of air to prevent overheating?

I think this is a good point.
Run this idea by AS when they phone and ask if there is any good reason for you to keep the cover.

That wouldn't work for me as the under bed area is my main storage for larger items of paddle kit and the flat cover over the heater is an ideal area for my folding chair, awning carpet and split paddles, all of which would likely cause damage to the pipework and wiring around the heater, if it wasn't for the cover.

I've not had the overheating issue, but if it is a common problem, perhaps a fully perforated cover would allow better ventilation than the current plastic vent/grille. A series of carefully drilled DIY holes would do the job, without undermining the strength of the cover too much.

I dont think my problem is due to ventilation issues. It is the heater electric element thats not working. The space heater works fine on gas.
Spoke AS they confirmed you have to get into the casing to re-set. They advise removing the back panel as can get to it from back doors lifting up the bed from that end. Plus these screws are covered with pop out plastic caps you can re-use.
Done that and at least I havent done my back in crouching under the bed from inside.
Waiting for the rain to stop before going back to find trip re-set on boiler.
Do not remove your casing top .. if anything gets in to the boiler compartment from your storage area it will melt or catch fire and ... well its obvious?
Think we are going to adapt back access panel and make it a pair of hinged doors  or larger more easily removable panels to get full access to boiler and better access to under bed store from rear which has always been a bit tight... when we get home.
Rain stopped so here's hoping trip will re-set and I can get on with hols!