Hot water on gas , help please

Swifter

Swifter

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Just trying to get the hot water working on gas . I’ve checked the internal isolation tap . Outside cover is off but I don’t understand how start heating the water . There doesn’t seem to be a green light when I turn it to the gas symbol . Any ideas please ?
A74550B3-D289-4511-928C-DF3DC86F95EA.jpeg
 
Is the 12v system (hab battery) switched On?
Is the hab battery well charged?
Are you connected to EHU?

Presumably you don't have a manual for it so you can probably get one with a Google search.
E.g.

www.manualslib.com

TRUMA ULTRASTORE OPERATING AND INSTALLATION INSTRUCTIONS Pdf Download

View and Download Truma Ultrastore operating and installation instructions online. Truma Ultrastore Gas and Electric Storage Water Heater. Ultrastore water heater pdf manual download.
www.manualslib.com www.manualslib.com
 
I think it’s the ultra store control unit that’s faulty as I am getting no green or red lights . I’ve tried on and off EHU and replaced all the fuses .
BC1D5786-D27E-4E8C-B45D-751B91395C9B.png
. Trying to find a replacement. They are £130 at prima leisure !
 
Make sure the right hand dial is turned off or it will try to work off mains. If still nothing I suspect it's not getting 12v supply.
DP
 
Out of interest Is the Ultraheat (230v) working?

As you've checked the fuses my next step would be to check with a test meter that there's voltage present at the Ultrastore control unit (especially since neither the red light nor the green light illuminates).

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Last edited:
Spriddler said:
Out of interest Is the Ultraheat (230v) working?

As you've checked the fuses my next step would be to check with a test meter that there's voltage present at the Ultrastore control unit (especially since neither the red light nor the green light illuminates).
Click to expand...
Which wires to I need to test please ?
image.jpg
 
If there was power getting to the unit I would have thought the green light would have come on (possibly followed by red if there is a fault detected)
My unit developed a fault about 3yrs ago and I replaced it, it’s very similar to yours.
They are very flimsy inside, no wonder they play up after a while.
Its a very simple job to change the unit, just a tad expensive.
BUT as advised above by Spriddler in post #5, check you have power getting to the unit first of all otherwise you might be wasting your money getting a replacement
 
Stag man said:
If there was power getting to the unit I would have thought the green light would have come on (possibly followed by red if there is a fault detected)
My unit developed a fault about 3yrs ago and I replaced it, it’s very similar to yours.
They are very flimsy inside, no wonder they play up after a while.
Its a very simple job to change the unit, just a tad expensive.
BUT as advised above by Spriddler in post #5, check you have power getting to the unit first of all otherwise you might be wasting your money getting a replacement
Click to expand...
Thank you . What is the best way to test to ensure power is getting into the unit ?
 
I’m having a go at reading the online manual.
I can’t see any wiring diagrams to show which colour is the 12v feed
As usual, the manufacturers info is about as much use as a chocolate teapot

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try green + brown for power,
 
You could simply use your meter to habitation earth and put the positive to each of the wires in turn.
1 should read a voltage, if none assuming the hab electrics are switched on.....
Then no power supply.
 
PS, I am happy to be corrected on that strategy but in the absence of a wiring diagram it is very much trial and error, ensuring that any nasty error is avoided 🙄
 
I can’t seem to find any power but I am totally confused . There is a connection between the ultrastore control unit and the boiler , but where are the incoming power wires ?
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From the manual, it implies that all of the cabling from the Truma control unit goes to the boiler.
At least that’s where the Book of Words says the fuse is to be found, so it is possible all of the wires shown in your pic go direct to the boiler, one will then go to a gas valve another one (or poss 2 will go to the ignition unit on the gas burner, the other(s) will be the 12v feed.
It sounds so simple, I’m sure it’s not, good luck
 
DP+JAY said:
Make sure the right hand dial is turned off or it will try to work off mains. If still nothing I suspect it's not getting 12v supply.
DP
Click to expand...
Not sure the right hand dial is related to the hot water Truma part.
I’m only a Ultrastore owner but think the Ultraheat part relates to heating.

Off picture, the Ultraheat will have a separate mains on/off switch. You can have mains only, 12v only or both on. Combined you get hot water faster. 😀
In this pic, we’re not heating water.
E69FDAF9-C5ED-4F57-89CE-DA484020F6AB.jpeg

The outer dial of the right side panel is off or on gas. The inner dial is how hot. Max. is 70degC. On gas, a green light comes on. And after 30min or so, you’ll have hot water. Or a red light comes on if there’s no gas - due to no gas or too much air.
In this state, you need to turn the Ultraheat gas selector to off.
And try again in a couple of minutes.

On EHU the left side on/off is for mains power. When that’s on, expect HW in over 40min. Always 70degC

Turn on Gas and EHU power and get HW in :h:0min 😆
 
No one else has said it so I will. Is your gas on? And... do you have water in the heater tank (not just air)?
 
Itsmcb said:
No one else has said it so I will. Is your gas on? And... do you have water in the heater tank (not just air)?
Click to expand...
Thank you for the suggestion. The issue is there is no power . If the gas was off the light would go to red . I don’t get any lights at all .
 
going to order a new control unit and wiring loom . In the past the light did come on so something has stopped working . Worth a try .
 
Swifter said:
Thank you for the suggestion. The issue is there is no power . If the gas was off the light would go to red . I don’t get any lights at all .
Click to expand...
ah, I didn't think that through properly, sorry.
 
Swifter said:
Which wires to I need to test please ?
Click to expand...
I'm not familiar with that heater and would need to refer to a wiring dia. but I'm dodging tropical rain showers at the moment re-felting my shed roof and have just stopped for a quick brew.
However, I find it odd/suspicious that neither the red nor green lights are illuminating at all. You say you've checked the fuses. I don't know how many are involved in the entire heater 12v supply/circuitry but it's worth double checking whether there's either still one that you haven't found that's blown or one of those you've checked (with a meter?) is actually blown.
Just for clarity, are other 12v systems working without being on EHU, (lights. loo pump etc?).
The difficulty with trying to diagnose online is that one doesn't know what an OP hasn't said. ;)
 
Spriddler said:
I'm not familiar with that heater and would need to refer to a wiring dia. but I'm dodging tropical rain showers at the moment re-felting my shed roof and have just stopped for a quick brew.
However, I find it odd/suspicious that neither the red nor green lights are illuminating at all. You say you've checked the fuses. I don't know how many are involved in the entire heater 12v supply/circuitry but it's worth double checking whether there's either still one that you haven't found that's blown or one of those you've checked (with a meter?) is actually blown.
Just for clarity, are other 12v systems working without being on EHU, (lights. loo pump etc?).
The difficulty with trying to diagnose online is that one doesn't know what an OP hasn't said.
Click to expand...
Everything else appears to be working . Will double check when I get back later and will also be checking the wiring loom . 👍🏻
 
On our Swift wuch 2007, the heat symbol bottom left on control panel has to be turned on, hope im on the right track
Eric

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