Truma Trumatic C 6002 Combi Boiler. Not starting when gas hob is on. (1 Viewer)

Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
Hi guys, Yesterday I noticed that my heating would not start. I knew that I had Propane because the gas hob was on.

I turned the gas hob off and the heating started.

Guessing that the bottle was low, I swapped to a full bottle. Everything was fine.

After putting the pot on the gas hob, for my morning coffee, I tried to start the heating. Again it would not start. The Propane bottle is still the full bottle that I put on last night. I turned off the gas hob and the heating started without any problems.

Any suggestions?
 
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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
Thanks for your replies pj650 & jezport. I just checked by turning on the gas hob and then the heater. I can see the gas hob flames lower, every time the heater tries to start. Does this confirm your thought?

The heater is not starting at all now. I will leave it for a while and try again. It sounds like the burner, inside the boiler, is trying and then stopping. When I set it to hot water only, it works fine, even with the gas hob on. Does this sound like your thought also?

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Feb 27, 2011
14,293
70,213
UK
Funster No
15,452
MH
Self Build
Exp
Since 2005
Thanks for your replies pj650 & jezport. I just checked by turning on the gas hob and then the heater. I can see the gas hob flames lower, every time the heater tries to start. Does this confirm your thought?

The heater is not starting at all now. I will leave it for a while and try again. It sounds like the burner, inside the boiler, is trying and then stopping. When I set it to hot water only, it works fine, even with the gas hob on. Does this sound like your thought also?
I would have suggested regulator as well. However, is it getting very cold near you? Are you on butane by any chance?
If it is not cold and you are not using butane, then the regulator is as others have said the most likely cause.
 
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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
Another thought you are in Spain, Spainish LPG can be up to 65% butane. This often causes Combi's to fall over if you get a chilly night. A Combi won't run on high butane content if it start to get cold also butane can't supply the flow rate Combi's need.
That's not good news Lenny HB,

I only use the heating when it's cold šŸ¤£šŸ¤£šŸ¤£.

It's up to 16Ā° outside now but it was quite cold last night (Cold for where I am). Is there anything that I can do about this? It's going to get colder before the spring weather comes into full swing.
 
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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
I would have suggested regulator as well. However, is it getting very cold near you? Are you on butane by any chance?
If it is not cold and you are not using butane, then the regulator is as others have said the most likely cause.
Thanks Gromett, I'm on Propane but Lenny HB said that Spanish Propane can contain upto 65% Butane. It's up to 16Ā° outside now but it was quite cold last night (Cold for where I am).

Is there a service kit for the boiler? Maybe a new regulator and a good service might help it.

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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
Yep faulty regulator, if it's a bulkhead regulator a very common fault. They get gummed up with the oily residues in the gas. Only cure is a new regulator.
This is the regulator Lenny HB.
20221126_104437.jpg
 

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JockandRita

LIFE MEMBER
Aug 2, 2007
11,146
138,817
Lincs/Cambs border
Funster No
49
MH
N+B Flair 8000i
Exp
Since May 05 (Ex Tuggers).
I thought it was Spanish Autogas which contained 65% Butane, and not domestic Propano cylinders. For 3 x years we have run our Truma and Alde heating off an external Propano cylinder, during overnight frosty temperatures, with no problems at all. I cut a plastic bottle in half, and placed that over the regulator to prevent it from freezing. ;)

Those Gok regulators are normally very reliable, and in that particular cylinder connection, is unlikely to be gummed up, however, they do not last for ever, but are cheap to replace.

HTH,

Jock. :)

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Lenny HB

LIFE MEMBER
Oct 18, 2007
50,033
137,488
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
This is the regulator Lenny HB. Tthey rarely
View attachment 691382
That is a bottle top regulator they rarely fail but are cheap so worth replacing, should be replaced every few years anyway.
I see you are on exchange bottles are you sure you are on propane as Repsol bottles Butane & Propane are both orange, the Propane ones have Propane printed on a small blue band around the middle.
 

JockandRita

LIFE MEMBER
Aug 2, 2007
11,146
138,817
Lincs/Cambs border
Funster No
49
MH
N+B Flair 8000i
Exp
Since May 05 (Ex Tuggers).
PeteMallorca. Your second photo showing the cylinders, has Butano stamped into the handle. Are you sure you are on Propane?

Jock. :)

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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
That is a bottle top regulator they rarely fail but are cheap so worth replacing, should be replaced every few years anyway.
I see you are on exchange bottles are you sure you are on propane as Repsol bottles Butane & Propane are both orange, the Propane ones have Propane printed on a small blue band around the middle.
Thanks Lenny, yes, they are propane.
20221126_114532.jpg
 
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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
That is a bottle top regulator they rarely fail but are cheap so worth replacing, should be replaced every few years anyway.
I see you are on exchange bottles are you sure you are on propane as Repsol bottles Butane & Propane are both orange, the Propane ones have Propane printed on a small blue band around the middle.
Thanks Lenny,

I've ordered a replacement regulator. The same make and model. But !! When checking that the replacement was the same as the original, I noticed "2020" printed on the original regulator. Presuming this was replaced in 2020, should it fail so soon?

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Feb 22, 2016
3,347
9,689
York
Funster No
41,744
MH
Bailey 620 Approach
Exp
Since 2015
Truma regulators are rebranded GOK.
Who knew? But when we had two Trumaā€™s fail, the supplier of our refillable system (Autogas 2000) recommended the Gok one which, touch wood, hasnā€™t yet let us down. We also carry a spare now.
 
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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
I have also ordered one of these, will it be compatible for my system?
IMG_20221126_120437.jpg

Flame King ACR6a 2-Stage Auto Changeover LP Propane Gas Regulator for RVs, Vans, and Trailers​

The Auto-Changeover LP Regulator allows you to hook up to 2 Propane tanks. The regulator automatically switches over to the second tank once the first one runs out (and vice versa). The indicator changes color to let you know when a tank has been depleted and needs to be refilled. The inlet is a 1/4" SAE inverted flare and the outlet is a 3/8" NPT female brand new and ready to ship. Rated for 190, 000 BTU


  • Allows removal of empty cylinder for refill without interrupting propane supply
  • For RVs with dual propane tanks; Automatically switches from primary to reserve tank when primary is empty
  • Compatible with Flame King's 48-Inch Thermo Plastic Hose, item 100383-48 and 12-18 inch Pigtails - E12INPT, E15INPT or E18INPT
  • Double stage design maintains constant gas pressure under changing demand and conditions
  • Inlets are 1/4" SAE inverted flare and outlet is 3/8" NPT female pipe thread
  • Rated for 190, 000 BTU

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Lenny HB

LIFE MEMBER
Oct 18, 2007
50,033
137,488
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
Thanks Lenny,

I've ordered a replacement regulator. The same make and model. But !! When checking that the replacement was the same as the original, I noticed "2020" printed on the original regulator. Presuming this was replaced in 2020, should it fail so soon?
No they normally last 10 years or more but recommend to replace sooner.
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
50,033
137,488
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
I have also ordered one of these, will it be compatible for my system?
View attachment 691400

Flame King ACR6a 2-Stage Auto Changeover LP Propane Gas Regulator for RVs, Vans, and Trailers​

The Auto-Changeover LP Regulator allows you to hook up to 2 Propane tanks. The regulator automatically switches over to the second tank once the first one runs out (and vice versa). The indicator changes color to let you know when a tank has been depleted and needs to be refilled. The inlet is a 1/4" SAE inverted flare and the outlet is a 3/8" NPT female brand new and ready to ship. Rated for 190, 000 BTU


  • Allows removal of empty cylinder for refill without interrupting propane supply
  • For RVs with dual propane tanks; Automatically switches from primary to reserve tank when primary is empty
  • Compatible with Flame King's 48-Inch Thermo Plastic Hose, item 100383-48 and 12-18 inch Pigtails - E12INPT, E15INPT or E18INPT
  • Double stage design maintains constant gas pressure under changing demand and conditions
  • Inlets are 1/4" SAE inverted flare and outlet is 3/8" NPT female pipe thread
  • Rated for 190, 000 BTU
As long as it is the same pressure it should be OK .
 
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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
As long as it is the same pressure it should be OK .
I've searched everywhere for this information but can't find it.

I've emailed Flameking and asked for the specifications for their unit. At least the other one is on its way.

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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
Possibility of it being the gas valve on the boiler.
Is that something that I could get to Lenny HB and clean? I am looking now, for a compressed air canister, to blow through the pipe, from the boiler to the regulator, while the regulator is off.

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Jan 28, 2008
9,942
17,619
Dovercourt, Harwich, UK
Funster No
1,353
MH
Renalt burstner
Exp
7 years campers before that
almost certain to be regulator the fact that the cooker drops when the heater tries to light is lack of gas flow the changeover valve will be fine i dont think they are rated for any particular pressure other than a maximum
 
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PeteMallorca
Jun 26, 2022
163
56
Mallorca, Spain
Funster No
89,512
MH
Benimar sport 340
Exp
Benimar sport 340
almost certain to be regulator the fact that the cooker drops when the heater tries to light is lack of gas flow the changeover valve will be fine i dont think they are rated for any particular pressure other than a maximum
Thanks mitzimad, That does make sense, thats why i checked it with the cooker on. Running on "Hot water" only, theres no problem but as soon as I change to heating, the cooker starts fluctuating.

I'm just concerned that the regulator that's fitted now, has "2020" printed on it. That's now very old, to have failed


I need to find a way to clean the pipes, when I fit the new regulator, to make sure that there's nothing restricting the pressure.

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