Dometic gas burner problem

[helzie2020]

We have a problem with our gas hob, just started tonight. When I light the front burner, it burns for about 40 seconds on high then the flame reduces itself to very low but doesn’t go out.

Once the burner has been turned off for around one minute, I can get the burner to re-light and again burn high but only for 30 seconds again. This keeps happening, i.e. I can get 30 seconds on full flame repeatedly, which suggests that the gas is getting through.

The smaller back burner seems to be working normally.

We did have an E517 H error code (Gas supply interrupted) on the Truma when we put on the water heater yesterday, and again today, but that has cleared now.

We have a Gaslow cylinder which was refilled not that long ago and the gauge is showing that the tank is full.

I’ve tried cleaning carefully around the burner.

We have a 2021 Globecar Roadscout.

Any ideas?

 

[Basildog]

It sounds suspiciously like like a regulator problem
Try lightning all your appliances/ burners simultaneously.
Who last tested your gas system as they haven’t replaced the test nipple cover ?
Drives me nuts and they corrode and leak if left open .
We see far too many vans that have just been allegedly checked by the habitation experts with missing caps

 

[TerryL]

Agree it sounds like a regulator problem, but on a 2021 van that would be unusual methinks.
Just a thought and am happy to be corrected but I see that's a rubber connecting hose. Maybe replace witha a stainless in case the hose is failing (temporary blockage) inside?

 

[Jimbohorlicks]

The photo shows a calor bottle, have you tried connecting up to that ,which will then check if your regulator is working ok. If the same issue is there with the calor ,then defo a regulator problem.

 

[Basildog]

The photo shows a calor bottle, have you tried connecting up to that ,which will then check if your regulator is working ok. If the same issue is there with the calor ,then defo a regulator problem.

Or maybe not But still worth a try
Often with a regulator failure a brand new completely full cylinder will give high enough pressure to operate correctly,
Once a third down the cylinder the owners then tell us it’s taken 20 minutes to refill their gas cylinder
Basically they have now overfilled the cylinder

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[Basildog]

Just had a thought, turn the cylinder off and also check if the pigtail has a button as I can’t see from your picture .
Turn cylinder back on and press button if it’s a rupture protection hose .

 

[helzie2020]

It sounds suspiciously like like a regulator problem
Try lightning all your appliances/ burners simultaneously.
Who last tested your gas system as they haven’t replaced the test nipple cover ?
Drives me nuts and they corrode and leak if left open .
We see far too many vans that have just been allegedly checked by the habitation experts with missing caps

Hi

Sorry for the delay in responding to your suggestions.

We picked up the van new from the dealer in December so there haven't been any further gas checks after that and everything has been working fine up until yesterday.

We have a Truma Combi system. I'm not sure if its 4E or 6E as we seem to have 5 outlets!

It was the dealer who fitted the Gaslow system before we picked up the van. Their invoice lists a Gaslow 6kg Direct Fill Kit, Gaslow UK Propane reg adapter and Gaslow Filler Kit. I checked with Gaslow, who told me I could drive without turning the gas off so I presume there is rupture protection.

If I try to turn on the Truma water heater on gas, I get E517 H error code (Gas supply interrupted). That started yesterday and is still ongoing. I can clear the error message if I switch the water heater back to OFF but it reappears whenever I try to heat the water again.

The front (larger) burner on the hob is not working correctly, which started last night (just after we had the Truma error message). It IS lighting and will burn with a full flame for 30-40 seconds before it reduces to the minimum flame then continues to burn. I have tested this numerous times last night and today and it acts the same every time (as long as we give it about a minute to recover between tries).

If I try to light both burners, then both burners immediately reduce to the minimum flame then go out.

Up until this evening, the small back burner on the hob was working absolutely normally. The flame was the usual size and heated several kettles last night and today. However, it has also now (24 hours later) started misbehaving, just like the larger burner.

I did think of swapping to the Calor bottle but haven't ever used it since we got the van and (a) I don't know how to (not very sensible) and (b) I probably don't have the tools with us (not very sensible either).

I am aware that you shouldn't try to overfill the Gaslow bottle so haven't.

I've tried turning off the Gaslow cylinder at the top then turning it back on — no luck.

I don't really know what a pigtail is and where it might be. I did a google search but I don't see anything on our bottle which looks like images of a pigtail. I don't see any buttons to press. I've attached another couple of photographs of the Gaslow.

I recorded a video of lighting the burner which is saved on Dropbox here:
Video on Dropbox

 

[Basildog]

The pigtail is the orange high pressure hose , you don’t have a CS regulator so it’s probably not got a button on your hose .
No you don’t have the correct regulator to leave your gas on when travelling .
Where are you ?

 

[Plumb]

Hi

Sorry for the delay in responding to your suggestions.

We picked up the van new from the dealer in December so there haven't been any further gas checks after that and everything has been working fine up until yesterday.

We have a Truma Combi system. I'm not sure if its 4E or 6E as we seem to have 5 outlets!

It was the dealer who fitted the Gaslow system before we picked up the van. Their invoice lists a Gaslow 6kg Direct Fill Kit, Gaslow UK Propane reg adapter and Gaslow Filler Kit. I checked with Gaslow, who told me I could drive without turning the gas off so I presume there is rupture protection.

If I try to turn on the Truma water heater on gas, I get E517 H error code (Gas supply interrupted). That started yesterday and is still ongoing. I can clear the error message if I switch the water heater back to OFF but it reappears whenever I try to heat the water again.

The front (larger) burner on the hob is not working correctly, which started last night (just after we had the Truma error message). It IS lighting and will burn with a full flame for 30-40 seconds before it reduces to the minimum flame then continues to burn. I have tested this numerous times last night and today and it acts the same every time (as long as we give it about a minute to recover between tries).

If I try to light both burners, then both burners immediately reduce to the minimum flame then go out.

Up until this evening, the small back burner on the hob was working absolutely normally. The flame was the usual size and heated several kettles last night and today. However, it has also now (24 hours later) started misbehaving, just like the larger burner.

I did think of swapping to the Calor bottle but haven't ever used it since we got the van and (a) I don't know how to (not very sensible) and (b) I probably don't have the tools with us (not very sensible either).

I am aware that you shouldn't try to overfill the Gaslow bottle so haven't.

I've tried turning off the Gaslow cylinder at the top then turning it back on — no luck.

I don't really know what a pigtail is and where it might be. I did a google search but I don't see anything on our bottle which looks like images of a pigtail. I don't see any buttons to press. I've attached another couple of photographs of the Gaslow.

I recorded a video of lighting the burner which is saved on Dropbox here:
Video on Dropbox

Defiantly sounds like a pressure drop problem , particularly as you have said the supply won't maintain both burners simultaneously , indeed all of your appliances are suffering the same issue sounds like a govener problem . Needs a manometer on the test point to check standing pressure and then turn on appliances to check the dynamic pressure

 

[helzie2020]

We are on a trip at the moment. Due home (Glasgow) on Tuesday. I presume that all the van equipment is still under warranty with the dealer (it's only 6 months old) but I was hoping it might be something that would be easy to fix ourselves, especially since the dealer won't be open until Monday and they are nearly 200 miles away! I expect we'll have to travel there (which will be the second time with a problem since we got it).

After being down to one burner last night, we stopped in Halfords this morning and bought a portable gas single burner — good job, or we wouldn't have had any dinner at all tonight when the second burner stopped working.

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[Basildog]

If you are anywhere near Thirsk North Yorkshire we keep that regulator in stock and I can swap it if yours is dead , GOK are pretty good with warranty.
This is your regulator although we still have it as Truma it’s a GOK

GOK Caramatic BasicOne 30Mbar Caravan Motorhome Regulator 8mm

30mbar low pressure 8mm gas regulator. Feed out to the van is 8mm to suit copper or steel pipe fittings and comes complete with compression fitting.

autogasshop.co.uk

 

[helzie2020]

If you are anywhere near Thirsk North Yorkshire we keep that regulator in stock and I can swap it if yours is dead , GOK are pretty good with warranty.
This is your regulator although we still have it as Truma it’s a GOK

GOK Caramatic BasicOne 30Mbar Caravan Motorhome Regulator 8mm

30mbar low pressure 8mm gas regulator. Feed out to the van is 8mm to suit copper or steel pipe fittings and comes complete with compression fitting.

autogasshop.co.uk

Sorry, what's GOK?

 

[Basildog]

It’s the brand

 

[Landy Andy]

Sounds like a duff regulator to me. Allows small amount of gas through to pressurise the system, then you operate a gas device, it lights, but can’t provide the required amount of gas. So only briefly stays alight.

Go and see Basildog if possible, so you get a professional opinion, and solution

 

[Lenny HB]

We have a Truma Combi system. I'm not sure if its 4E or 6E as we seem to have 5 outlets!

4E is 4kw, 6E is 6kw number of outlets in the van is ilrelavant.

Agree with other duff regulator.

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[helzie2020]

If you are anywhere near Thirsk North Yorkshire we keep that regulator in stock and I can swap it if yours is dead , GOK are pretty good with warranty.
This is your regulator although we still have it as Truma it’s a GOK

GOK Caramatic BasicOne 30Mbar Caravan Motorhome Regulator 8mm

30mbar low pressure 8mm gas regulator. Feed out to the van is 8mm to suit copper or steel pipe fittings and comes complete with compression fitting.

autogasshop.co.uk

We are in Scotland on our way home to Glasgow for tomorrow night so not near Thirsk. I’ll phone the dealer tomorrow and see if they can send us somewhere local.

Thanks to everyone’s advice as ever.

 

[Russell's Dad]

Might be worth you fitting a Crash Safe regulator, then you will be safe to drive with the gas on. Gaslow's standard regulators (GOK branded) are not Crash Safe. The Gaslow cylinders do have a valve which will cut output in the event of rupture, but I think that only covers hose rupture ( I.e between the bottle and the regulator). The regulator reduces the flow to a steady 30mb or thereabouts. Thus the name. A rupture between the regulator and the appliances wouldn't cause the bottle safety valve to shut-off as it wouldn't cause any difference in pressure at that valve.
I researched this and changed my fitted Gaslow (GOK) regulator for a Truma Duo CS regulator ( cheapest price was from Gas-it ironically).
I would suggest maybe you do something similar, then you could have one bottle as you currently have and could add another bottle if and when you wanted.
I fitted mine myself as it's not difficult and I've changed a regulator on a previous van, so was confident.

 

[Basildog]

Might be worth you fitting a Crash Safe regulator, then you will be safe to drive with the gas on. Gaslow's standard regulators (GOK branded) are not Crash Safe. The Gaslow cylinders do have a valve which will cut output in the event of rupture, but I think that only covers hose rupture ( I.e between the bottle and the regulator). The regulator reduces the flow to a steady 30mb or thereabouts. Thus the name. A rupture between the regulator and the appliances wouldn't cause the bottle safety valve to shut-off as it wouldn't cause any difference in pressure at that valve.
I researched this and changed my fitted Gaslow (GOK) regulator for a Truma Duo CS regulator ( cheapest price was from Gas-it ironically).
I would suggest maybe you do something similar, then you could have one bottle as you currently have and could add another bottle if and when you wanted.
I fitted mine myself as it's not difficult and I've changed a regulator on a previous van, so was confident.

Gaslow don’t supply any GOK or Truma regulators ?
Was the Gasit CS regulator one of the new Truma black ones or was it old stock silver type ?

 

[Russell's Dad]

Gaslow don’t supply any GOK or Truma regulators ?
Was the Gasit CS regulator one of the new Truma black ones or was it old stock silver type ?

My bad. It was a Cavagna. I fitted the new black Truma CS duo.

 

[Landy Andy]

I’ve gone the other way. I want reliability so binned the Truma, and fitted a Cavagna unit.

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[Lenny HB]

Basildog how reliable are the new Truma regulators?

 

[Plumb]

---

How long is a piece of string ,um how reliable sounds like the kiss of death too me

 

[Basildog]

Basildog how reliable are the new Truma regulators?

We have seen a few failures but nothing like when the old Truma branded GOK regulators were failing.
All LPG has heavy ends in it including the exchangeable cylinders like Calor etc , when Truma / GOK added the elbow to the regulator and told the Caravan/ Motorhome manufacturers to mount the regulator higher than the outlet on the cylinders, they pretty much solved it .
All the talk about about it being the rubber hoses was really a load of nonsense, we also suspect that the tolerance in the regulator was tiny so a slight swelling of the rubber components caused failure.
I have actually just been involved in getting a bulletin put out by the NCC which will hopefully stop the confusion about hose life , basically there isn’t an expiration date on most modern hoses .
I will put a separate post up

 

[helzie2020]

We have seen a few failures but nothing like when the old Truma branded GOK regulators were failing.
All LPG has heavy ends in it including the exchangeable cylinders like Calor etc , when Truma / GOK added the elbow to the regulator and told the Caravan/ Motorhome manufacturers to mount the regulator higher than the outlet on the cylinders, they pretty much solved it .
All the talk about about it being the rubber hoses was really a load of nonsense, we also suspect that the tolerance in the regulator was tiny so a slight swelling of the rubber components caused failure.
I have actually just been involved in getting a bulletin put out by the NCC which will hopefully stop the confusion about hose life , basically there isn’t an expiration date on most modern hoses .
I will put a separate post up

Are you Autogas 2000 Leisure Ltd in Thirsk?

 

[Basildog]

Yes that’s us

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[helzie2020]

We visited Autogas 2000 Leisure Ltd in Thirsk today. So, it turns out that the problem wasn't a faulty regulator as such. It seems the dealer's workshop that installed the Gaslow bottle had overtightened something, causing a washer to be shredded. At least, that's what I understood happened!

Anyway, the problem pushed us to finally decide to upgrade our gas supply. We now have two 11kg Alugas bottles with a automatic switchover regulator with crash sensor and an external fill point. Much better than the previous 6kg Gaslow plus 6kg Calor but with no crash sensor regulator and no external fill point.

Thanks everyone for all the help and advice. And thanks to Basildog and Autogas 2000 Leisure.

 

[Basildog]

We visited Autogas 2000 Leisure Ltd in Thirsk today. So, it turns out that the problem wasn't a faulty regulator as such. It seems the dealer's workshop that installed the Gaslow bottle had overtightened something, causing a washer to be shredded. At least, that's what I understood happened!

Anyway, the problem pushed us to finally decide to upgrade our gas supply. We now have two 11kg Alugas bottles with a automatic switchover regulator with crash sensor and an external fill point. Much better than the previous 6kg Gaslow plus 6kg Calor but with no crash sensor regulator and no external fill point.

Thanks everyone for all the help and advice. And thanks to Basildog and Autogas 2000 Leisure.

Yes it was the washer in your 21.8 LH to POL adaptor , over tightened so washer was Maladgerated and blocking any gas flow from the Gaslow cylinder .
Was nice meeting you , enjoy your travels
Charlie