Webasto oil/electric heater blowing cold air

[Gonestravaiging]

Hi, I have a two and a half year old van and the hab heating system is suddenly blowing cold air. The fuel level is high, the leisure battery is fully charged. Any suggestions of what the problem might be are most welcome. It's a Webasto Thermo Top Evo. Many thanks

 

[daveandsan]

Ignition problem maybe or fuel pump.
tonka

 

[Gonestravaiging]

Thanks. In which case, beyond my capabilities!

 

[daveandsan]

Thanks. In which case, beyond my capabilities!

Someone may have some more ideas.

 

[pjay]

You need to run them at least once a month or the diesel can run back along the pipe with time and then won't fire up properly, happened to mine once and I had to reset it (ENC Fifer M with a thermo top).

Pete

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[Sasbo]

Try switching it off and leave for 10 mins or so. This gives the inbuilt safety system time to power down and reset as sometimes it can go into loop mode for no discernible reason.

 

[Gonestravaiging]

Thanks Pete, I've got a Touring L. It wasn't run for several months but then I took the van to the north west 10 days ago and the heater was working fine at that point! But at least I now know that I should run the heater regularly over winter!

 

[Gonestravaiging]

Try switching it off and leave for 10 mins or so. This gives the inbuilt safety system time to power down and reset as sometimes it can go into loop mode for no discernible reason.

Hi, I've tried that thanks, to no avail.

 

[Gonestravaiging]

You need to run them at least once a month or the diesel can run back along the pipe with time and then won't fire up properly, happened to mine once and I had to reset it (ENC Fifer M with a thermo top).

Pete

Thanks Pete, I've got a Touring L. It wasn't run for several months but then I took the van to the north west 10 days ago and the heater was working fine at that point! But at least I now know that I should run the heater regularly over winter!

 

[pjay]

This might help, worked for me. If not give Darren at ENC a call, he'll sort it.

"Webasto heater..


Diesel run back, burner won't stay on or won't start, can happen if the heater hasn't been run for over a month.


To reboot system..


You will need 2 people for this first bit.

Person 1 turn on circular control panel, press white burner button on and within 3 seconds Person 2 remove yellow 20amp fuse from the leisure battery compartment wall.


Leave yellow 20amp fuse out for at least 40 seconds then replace fuse, there maybe a small spark as you put it back in.

Quickly turn the white burner button off and then on again, leave for a few minutes and the system/burner should then restart.


This should clear the problem but if not repeat."


Run diesel heater at least once a month to prevent problems.

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[Gonestravaiging]

This might help, worked for me. If not give Darren at ENC a call, he'll sort it.

"Webasto heater..


Diesel run back, burner won't stay on or won't start, can happen if the heater hasn't been run for over a month.


To reboot system..


You will need 2 people for this first bit.

Person 1 turn on circular control panel, press white burner button on and within 3 seconds Person 2 remove yellow 20amp fuse from the leisure battery compartment wall.


Leave yellow 20amp fuse out for at least 40 seconds then replace fuse, there maybe a small spark as you put it back in.

Quickly turn the white burner button off and then on again, leave for a few minutes and the system/burner should then restart.


This should clear the problem but if not repeat."


Run diesel heater at least once a month to prevent problems.

Thanks pjay, I'll certainly try that. I have a Fife Touring L.

 

[Sasbo]

Do you have the rotary (manual) or digital controller? As a last resort, you could unplug the controller by disconnecting the small plug on the short flylead coming off the back of the controller, allow 10 mins then reconnect. This should force the unit to a factory reset state, then follow the start up regime for a new installation.

 

[Gonestravaiging]

Do you have the rotary (manual) or digital controller? As a last resort, you could unplug the controller by disconnecting the small plug on the short flylead coming off the back of the controller, allow 10 mins then reconnect. This should force the unit to a factory reset state, then follow the start up regime for a new installation.

Hi, the digital one. I'll give it a go, thanks.

 

[Gonestravaiging]

This might help, worked for me. If not give Darren at ENC a call, he'll sort it.

"Webasto heater..


Diesel run back, burner won't stay on or won't start, can happen if the heater hasn't been run for over a month.


To reboot system..


You will need 2 people for this first bit.

Person 1 turn on circular control panel, press white burner button on and within 3 seconds Person 2 remove yellow 20amp fuse from the leisure battery compartment wall.


Leave yellow 20amp fuse out for at least 40 seconds then replace fuse, there maybe a small spark as you put it back in.

Quickly turn the white burner button off and then on again, leave for a few minutes and the system/burner should then restart.


This should clear the problem but if not repeat."


Run diesel heater at least once a month to prevent problems.

Hi, tried this several times with a pal today but no success. Still blowing cold. Looks like a trip to a garage. Thanks for the suggestion, may be useful in future.

 

[L' Hobo]

Don't know anything about Webasto but the Eberspacher on my VW has an inline fuel filter before it goes into the inline pump, that might be worth checking?

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[SM0129]

Does the controller flash? My older Webasto does and the number of flashes relates to fault codes

 

[pjay]

If you can wait until monday and before taking it to a garage, give Darren a call at East Neuk, i'm confident he'll know what it is and will be able to talk you through it, he's a very helpful guy, he builds them

01333 310440

Pete

 

[Gonestravaiging]

If you can wait until monday and before taking it to a garage, give Darren a call at East Neuk, i'm confident he'll know what it is and will be able to talk you through it, he's a very helpful guy, he builds them

01333 310440

Pete

That would be the obvious solution Pete...if I hadn't fallen out with ENC!

 

[pjay]

Oh dear, that's a shame, dare I ask why? You can message me if you'd rather not post in open forum.

...and have you got it fixed yet?

Pete

 

[PDrill]

Excuse me. You say you have Webasto Thermo Top Evo. It's a water heater meant to preheat the engine and it doesn't blow anything. Sure, it will blow through the cars own heater system (the vents in the dash) if correctly installed and operated, but if the Webasto runs (you will hear it) but it doesn't blow heat from the vents the problemisn't within the Webasto itself.

And yes, a Thermo Top Evo can be set up to heat the habitation but the it will use radiators like Alde and not blow anything.

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[Gonestravaiging]

Excuse me. You say you have Webasto Thermo Top Evo. It's a water heater meant to preheat the engine and it doesn't blow anything. Sure, it will blow through the cars own heater system (the vents in the dash) if correctly installed and operated, but if the Webasto runs (you will hear it) but it doesn't blow heat from the vents the problemisn't within the Webasto itself.

And yes, a Thermo Top Evo can be set up to heat the habitation but the it will use radiators like Alde and not blow anything.

What a very strange, and very nonsensical, reply. Are you suggesting I have radiators in my 6m van that I just haven't noticed for the past two years?!! And are you suggesting that the people above who have replied because they have the same heating system in the same type of van from the same supplier are making things up?!!

 

[gus-lopez]

It will also fail to fire up & blow cold air if the fluid level is low.

 

[cgwcmlw]

What a very strange, and very nonsensical, reply. Are you suggesting I have radiators in my 6m van that I just haven't noticed for the past two years?!! And are you suggesting that the people above who have replied because they have the same heating system in the same type of van from the same supplier are making things up?!!

PDrill is correct, as a medium Fifer owner myself, the van has two Webasto Water Heat Exchangers, "radiators", front and rear of the van. As PDrill says if the Thermo Top is firing up then possibly it is the hot water circulating pump that has gone faulty. This is located under the van on the drivers side fairly close to where the Thermo Top is. If it is running you can clearly hear a 'hum' from it. When on hook-up and using the 2KW immersion heater ONLY (i.e Thermo Top switched off) to heat the fluid to be pumped around the radiators are you getting hot air blown, if this is the case then you are back to issue being with the Thermo Top as the heating system is functioning correctly including the pump.

 

[Gonestravaiging]

PDrill is correct, as a medium Fifer owner myself, the van has two Webasto Water Heat Exchangers, "radiators", front and rear of the van. As PDrill says if the Thermo Top is firing up then possibly it is the hot water circulating pump that has gone faulty. This is located under the van on the drivers side fairly close to where the Thermo Top is. If it is running you can clearly hear a 'hum' from it. When on hook-up and using the 2KW immersion heater ONLY (i.e Thermo Top switched off) to heat the fluid to be pumped around the radiators are you getting hot air blown, if this is the case then you are back to issue being with the Thermo Top as the heating system is functioning correctly including the pump.

Thanks for the message. No hot air being blown on hook-up either, so perhaps a pump issue.

 

[cgwcmlw]

Agreed, I presume you have hot water present in the van when on hook-up (immersion heater, (Red Switch) or when Diesel Thermo Top running, off grid. The hot water is derived from a calorifier placed inside the tank containing the anti freeze fluid used for pumping around the radiators. The anti freeze fluid can be heated either by Thermo Top, Immersion heater or both. If you have hot water sounds very much like you have a pump issue or related wiring. When using the Thermo Top, the pump is switched on directly from the Thermo Top. When on Hook-up, i.e Immersion heater, the black switch with the green LED next to the heater digital controller operates the pump.

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[Gonestravaiging]

Agreed, I presume you have hot water present in the van when on hook-up (immersion heater, (Red Switch) or when Diesel Thermo Top running, off grid. The hot water is derived from a calorifier placed inside the tank containing the anti freeze fluid used for pumping around the radiators. The anti freeze fluid can be heated either by Thermo Top, Immersion heater or both. If you have hot water sounds very much like you have a pump issue or related wiring. When using the Thermo Top, the pump is switched on directly from the Thermo Top. When on Hook-up, i.e Immersion heater, the black switch with the green LED next to the heater digital controller operates the pump.

Hi many thanks for that. I haven't checked the hot water, just assumed it wouldn't be available! I will as soon as possible. Van currently on jack stands as getting wheels powder coated.

 

[cgwcmlw]

What was the outcome of above fault, did you manage to get repaired, be good to know the issue.

 

[Gonestravaiging]

What was the outcome of above fault, did you manage to get repaired, be good to know the issue.

Hi there, thanks for asking but no luck so far. Put it into a motorhome garage in Perth but they have no experience of diesel/electric systems and couldn't do anything. Now booked into somewhere that deals with Webasto systems. I'll post the solution if I get one!

 

[Gonestravaiging]

Hi many thanks for that. I haven't checked the hot water, just assumed it wouldn't be available! I will as soon as possible. Van currently on jack stands as getting wheels powder coated.

As you suggested, I'm getting hot water through the immersion when on hook-up, also getting heating through electric only when on hook-up. Which presumably means I have a problem only with the diesel.

 

[cgwcmlw]

As you suggested, I'm getting hot water through the immersion when on hook-up, also getting heating through electric only when on hook-up. Which presumably means I have a problem only with the diesel.

If you are getting heating through immersion on EHU then your water pump is fine and all other elements so that leaves the Thermo Top diesel under the van. When you push white 'on' button on the controller do you hear the diesel firing up and also you can check for exhaust at the Thermo Top diesel exhaust pipe next to rear driver side wheel. If the diesel appears to be running OK then perhaps back to the pump as it uses different circuitry when operated by the diesel. When the diesel starts it operates a relay to activate the water pump. This is located next to the liesure battery and on starting the diesel you should be able to hear it clicking on if you remove the battery cover. When the water pump is running it is quite audible, very close to where the Thermo Top exhaust is located.