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Truma Ultrastore - Sounding like a kettle when on Gas.

Jun 20, 2021
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Hi All - I wonder if I could get some advice about a strange issue that has just started with my Truma Ultrastore water heater.

My caravan is a 2001 Fleetwood Countryside, everything has been working fine in the last few trips, but now the water heater is making some unusual sounds on gas only.

Gas ON - and can hear it ignite, no red LED for unlit. Everything is fine for 10-15sec. then the sound of a kettle boiling, can hear it creaking. Still no red LED and will stop when turning the off toggle.

On elec it heats fine (slowly of course) and I originally thought it was due to being over temp. But today I have drained and refilled - let the hot tap run until a steady stream, and testing again with a cold system. Same problem.

Anyone seen this before? , not going to mess with Gas - but wondered if theres anything i can check first?.

Thanks again.
A
 
Nov 11, 2009
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2,001
40,935
Hi All - I wonder if I could get some advice about a strange issue that has just started with my Truma Ultrastore water heater.

My caravan is a 2001 Fleetwood Countryside, everything has been working fine in the last few trips, but now the water heater is making some unusual sounds on gas only.

Gas ON - and can hear it ignite, no red LED for unlit. Everything is fine for 10-15sec. then the sound of a kettle boiling, can hear it creaking. Still no red LED and will stop when turning the off toggle.

On elec it heats fine (slowly of course) and I originally thought it was due to being over temp. But today I have drained and refilled - let the hot tap run until a steady stream, and testing again with a cold system. Same problem.

Anyone seen this before? , not going to mess with Gas - but wondered if theres anything i can check first?.

Thanks again.
A
Could it be scale crackling? When was it last descaled. I’ve 5 litres of white wine vinegar going spare in my garage 🤭
 
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Jun 20, 2021
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Not been descaled in my ownership - 12months. So yes even if it isnt that, it needs doing.

Bought a couple of 5L and reading up on the process.

Its a really strange noise, like what you hear when metal is heating up / cooling but ive not heard it before, hence the worry.
 

Damian

Moderator
Mar 14, 2005
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At a guess I doubt very much if the heater has been descaled in its lifetime !
The "kettling" noise that you hear is limescale in the heater.
Fill with a mix 50/50 white wine vinegar and water and leave overnight.

Do NOT turn the heater on.

After 24 hours drain and flush through with a couple of aquarolls of fresh water
 

Damian

Moderator
Mar 14, 2005
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Yes, most certainly limescale causing that noise.
You may have to repeat the descaling a few times to get rid of it all, but it will be worth it.

It most likely has 20 years of build up inside it !!!
 
Jun 20, 2021
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Thanks Damian, Overnight for each flush? 50/50mix is what ive been reading. Hope to get it fixed by the weekend! Trip away planned.

Yep I bet there is 20 years of crud in there!
 

Damian

Moderator
Mar 14, 2005
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Yes, overnight for each treatment. and 50/50 is what you will need to get rid of the amount of scale in there.

Let us know how it goes please.
 
Jun 20, 2021
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So. 10L of white vinegar later, a good flush out and still sounding like a kettle. Next steps? Continue flushing!?

The 2nd batch that came out was clear unlike the first which was decidedly yellow.

Thanks
A.
 

Damian

Moderator
Mar 14, 2005
7,341
762
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You are trying to remove 20 years of buildup of limescale, it may take a lot of time, and vinegar to get it all out.
 

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