Hymer Truma heating

[EdwardFT]

I have more questions for the lovely helpful and knowledgeable people on here. I have a Hymer B584 2002 with Truma gas heating (Also electric for hot water but that is not relevant). The control says Trumatic C and has a circular dial for temperature control. It is on the outside wall of the wardrobe, and the boiler is inside the lower part of the wardrobe.
1. Where is the sensor? I can't find one, it is not above the door as someone said on another thread. Is it perhaps integral to the control?
2. It only heats up to about 7 degrees less than the figure on the control, even if it is not too cold outside (so it is not struggling to heat, it just thinks the job is done when it is not). If the sensor is inside the control that would explain it (the wardrobe is warm), and I would like to install a separate sensor. Is that easy?
3. At about 0 degrees C outside (clear sky but sheltered from wind) it will only heat up to 19 degrees or so, going continuously. Is this to be expected, or is is a sign that I need to get it serviced? The vents do blow warm air, but very gently.
4. Is there a way to add another sensor "in parallel", i.e. heating comes on if either sensor says so. Reason: the gas heating warms up underfloor and so keeps the water system warm; if I am on EHU with a heater in the habitation area, that won't happen. Or is there a sensible idea for keeping underfloor warm?

 

[Northernraider]

I have more questions for the lovely helpful and knowledgeable people on here. I have a Hymer B584 2002 with Truma gas heating (Also electric for hot water but that is not relevant). The control says Trumatic C and has a circular dial for temperature control. It is on the outside wall of the wardrobe, and the boiler is inside the lower part of the wardrobe.
1. Where is the sensor? I can't find one, it is not above the door as someone said on another thread. Is it perhaps integral to the control?
2. It only heats up to about 7 degrees less than the figure on the control, even if it is not too cold outside (so it is not struggling to heat, it just thinks the job is done when it is not). If the sensor is inside the control that would explain it (the wardrobe is warm), and I would like to install a separate sensor. Is that easy?
3. At about 0 degrees C outside (clear sky but sheltered from wind) it will only heat up to 19 degrees or so, going continuously. Is this to be expected, or is is a sign that I need to get it serviced? The vents do blow warm air, but very gently.
4. Is there a way to add another sensor "in parallel", i.e. heating comes on if either sensor says so. Reason: the gas heating warms up underfloor and so keeps the water system warm; if I am on EHU with a heater in the habitation area, that won't happen. Or is there a sensible idea for keeping underfloor warm?

What main control panel do you have?
I have a 2004 hymer ....same boiler and heating controls as you probably
Do they look like this ?

My main control panel is this one

And that black round button is the temp sender for the heating.


Ive never been impressed with the heating system

My next van will be getting a diesel heater fitted and if i self build a wood burner also.

 

[Figaro]

The room thermostat is a small round black button looking thing above the door.
The temp is set by the inner dial on the left in Tams picture.
The boiler starts slowly but after 10-15 minutes should be blowing a decent flow of warm air from the vents.

 

[walburga]

If you can access your boiler check that all the hoses are firmly pushed on...I had one hose that had come away...the only hose that had a secure fixing was the exhaust, that was jubilee clipped to the boiler, and also to the outlet end, all others were a 'push fit' onto the boiler outlets...and I regularly checked them!

Hope that helps.

Allen

 

[Fletton]

FYI.... On my Truma panel... there is a setting to allow you to "offset" the thermostat... i.e if it's situated in a warmer or colder location than "ambient" temperature in the Moho..

On your panel... My guess is that it may be within the "MENUE" function.. if available

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[Lenny HB]

FYI.... On my Truma panel... there is a setting to allow you to "offset" the thermostat... i.e if it's situated in a warmer or colder location than "ambient" temperature in the Moho..

On your panel... My guess is that it may be within the "MENUE" function.. if available

That only applies to the CP Plus panel that is from 2014, the OP's van 2004.

 

[Lenny HB]

Although there are some versions of the classic controller with the sensor built in I've never been aware of it on a Hymer.

When you find the sensor if you disconnect it the heater should run at full blast.

With the Truma Combi's there is no service requirement but if the fan is running slow it will cause overheating and the boiler will shut down. This can be caused by fluff & dust build up, worth a partial strip down clean out the impellor and lubricate the bearing.

 

[EdwardFT]

That's mine. Set to 30, giving me 20, when outside is at 6 degrees. Quite warm air coming from all the vents, but only very gently.

It is running full blast, that is just not enough.

 

[Lenny HB]

View attachment 453864That's mine. Set to 30, giving me 20, when outside is at 6 degrees. Quite warm air coming from all the vents, but only very gently.

It is running full blast, that is just not enough.

Not familiar with that controller but after a bit of searching I think it has the sensor build in, if you take it off the wall and have a look inside it should be fairly obvious.

This may be helpful.

Truma Trumatic C3402 boiler inspection and troubleshooting – Motor-Roam

motor-roam.co.uk

 

[EdwardFT]

Thanks for the link, that looks like a pretty comprehensive description.

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[two]

I'd check the fan.
It may not be able to spin fast enough.
Make sure nothing is around the spindle.

 

[Jake vE]

It is running full blast, that is just not enough.

I have the same one minus the electric function. When you say full blast, do you mean you notice it go from normal running to high running? Mine does that when there is a big temp difference.

I also have the same where the control panel would say 16C but the heating control would read 20C. I just offset this by turning it up.

I did notice a difference in the overall heating of the van by adjusting the vents as I have two fairly close to the thermostat. I closed them slightly to avoid a warm spot close to the thermostat so it warms the rest of the van evenly.

 

[EdwardFT]

Ah. When I said it was running full blast, I just meant that it is running all the time (that is to say, if it is failing to warm up enough, it is because it is inadequate, not because the thermostat cuts out as if it has reached temperature). I didn't know that it has 2 fan levels, if indeed my model does. Maybe my problem is that the higher power fan speed is not cutting in?

As for the temperature difference between control and reality, it is only mildly annoying. I do like to turn it down overnight, but not too far down, and it would be nice to know it was accurate.

 

[Manic]

Our 2001 B584 has the same controller and no other sensor, so I think it must be built in the controller.
Don‘t tend to use our blown heating but when we do the fan runs fairly fast until it heats up and then slows down so you can only just hear it.

 

[Jake vE]

Ah. When I said it was running full blast, I just meant that it is running all the time (that is to say, if it is failing to warm up enough, it is because it is inadequate, not because the thermostat cuts out as if it has reached temperature). I didn't know that it has 2 fan levels, if indeed my model does. Maybe my problem is that the higher power fan speed is not cutting in?

As for the temperature difference between control and reality, it is only mildly annoying. I do like to turn it down overnight, but not too far down, and it would be nice to know it was accurate.

Ah ok. Well assuming we have the same model which I think we do based on the controller, it should go to a high speed setting when there is a large temp delta between what you've set and what it is and then it should slow right down when approaching the selected temp.

To give you an idea, I've put the heating on when the internal temp has been 5C, the high speed fan setting kicks in until about 15C and then switched to slow fan until 20C.

I've also just realised that the link is to my friends website!

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[Fletton]

That only applies to the CP Plus panel that is from 2014, the OP's van 2004.

Although I did say... ".. if available "

 

[EdwardFT]

Ah ok. Well assuming we have the same model which I think we do based on the controller, it should go to a high speed setting when there is a large temp delta between what you've set and what it is and then it should slow right down when approaching the selected temp.

To give you an idea, I've put the heating on when the internal temp has been 5C, the high speed fan setting kicks in until about 15C and then switched to slow fan until 20C.

I've also just realised that the link is to my friends website!

Thanks for that info. Maybe I don't get the fan on high speed because it isn't cold enough. I don't know what it does at 5°C and I don't t plan on finding out.

 

[Lenny HB]

Thanks for that info. Maybe I don't get the fan on high speed because it isn't cold enough. I don't know what it does at 5°C and I don't t plan on finding out.

Should run at full speed it the temperature is only a few degrees below the set temperature i.e. if set to 25 and van is 20 it would run at full speed until nearly up to temperature.

 

[SwissBob]

This may be helpful when it becomes available - allows the sensor to be placed elsewhere. Our controller is also mounted on the wall of the wardrobe that contains the heater and so the heater cuts out at about 18C when the dial is set to 25 - the wardrobe is 27C and the Wall is around 24C . What a rubbish design. What I can't find is how to fit this thing if and when it becomes available.

 

[Lenny HB]

This may be helpful when it becomes available - allows the sensor to be placed elsewhere. Our controller is also mounted on the wall of the wardrobe that contains the heater and so the heater cuts out at about 18C when the dial is set to 25 - the wardrobe is 27C and the Wall is around 24C . What a rubbish design. What I can't find is how to fit this thing if and when it becomes available.

I think that is only for the later Combi's but not really need as you can adjust the offset on the controller.
My sensor is above the door and I adjust the offset so it coresopnds with the centre of the lounge temperature.

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[SwissBob]

I think that is only for the later Combi's but not really need as you can adjust the offset on the controller.
My sensor is above the door and I adjust the offset so it coresopnds with the centre of the lounge temperature.

It says 3402-C which is what I have and matches the controller pictured above but how is the offset adjusted? That would be cheaper option for sure.

 

[Lenny HB]

It says 3402-C which is what I have and matches the controller pictured above but how is the offset adjusted? That would be cheaper option for sure.

I looked at the link and it just said C series which I incorrectly assumed to be C4 & C6.