Webasto non canbus ECU conversion / replacement

Taking out the stock Webasto CANBUS controlled ECU and replacing it with a non-Webasto non-canbus third party ECU. All it needs is a +12v signal to fire it up.

Please note my temperature readings are wrong, my meter has a faulty sensor. I'm also using the wrong fuel pump so only getting about half the power output. My bad.

[gmc]

Watched almost all of the heater videos you have made good work!

[__WJK__]

Great video! Now all we need is an aftermarket LCD controller to pair w/the CANbus bypass board, hopefully with a timer control function and/or remote control function.

[walt-shju]

Ex girlfriends range rover had one of these heaters. When I noticed it Her dad called me a thick bar steward and said it was the ABS pump.
Funny thing was it said thermotop on sticker and smoked on cold mornings 😂

[VidarTeiseniHeisen]

2 kw output for 30 minutes I guess is about 1 kWh? But you probably also got som heat loss elsewhere in the circuit. So I guess your heater is bigger than 2 kw :-) Thanks for the funny and interesting videos 👍😊

[fabienguillet]

where can you find those third party boards? does it mean you can grab an old vehicle adapted coolant heater from the scrap, like on a audi or peugeot 806 and change the board to instal a control panel to use it as a heater for a camper with an aerotherm heater and water heater for the shower with a plate exchanger?

[B-si]

Hi David. What is that pink dosing pump you used in this video ? It does not look like any Webasto pump I've ever seen. I have tried a couple of cheap after-market dosing pumps but they could not provide even half the fuel required for a ThermoTop C at full power.

[colintinker]

If you've still got the original PCB then remove the silicon sealant from the 2 electrolytic capacitors. There are surface mount resistors under there that will be open circuit. The acid in the sealant eats them! Replace the resistors and it will probably work again. That's how I fixed my unit.

[loz]

Looking forward to the shower conversion great job with the videos and information

[Nfario]

Greetings. I just bought a webasto thermo top z/c -D, with data sheet n90906 5h8 007 633-10. I would need to understand if this type of card works without vehicle diagnostics or w bus. If it just works, what do I connect pin n3 to the positive or negative of the battery to make it turn on? Also is pin n6, for the diesel pump, positive or negative? Thank you.

[karldingbat]

Did you find the high frequency noise from the mosfets was a lot more noticable on the aftermarket 1 compared to the origanal webasto 1 ?

[CriftinsCampers]

These afaik are rated at typically 5KW and should heat water to 80c by default iirc
I suspect this one stopped at 60c and then modulated back hence the relatively low power output result.

is the resistance range of your water temp sensor compatible with this PCB?
Are these PCBs set to maintain a lower temp, e.g for dhw use?

[richardfearn]

Excellent...70% efficiency is pretty good? These German heaters seem to need sometimes expensive repairs so I have to ask is this a personal hobby and mission? Anyway deep respect and top job David. Cheers Richard

[aatu]

Would this work in canbus car? How does the fuel pump run? Does it need canbus signal

[peterolver]

Hi David. I have a thermotop V The trouble im having is it will run perfect for 1 hour and then shut down. Even when it cools it will not start up again even when the W-bus is flashing. the heater is circulating through a heat exchanger to heat water for window cleaning which we think will be cooling the water as it ciculates . I was wondering if replacing the ECU card would set the heater back to factory setting as i have read that it could be set at one hour for the car it was in. Any info would be appreciated.

[bigcol]

Hi David, love your videos, I bought ourselves a brand new webasto evo thermotop. All installed, went to turn it on, nothing.
I’m seeing this video am thinking that I have bout one with a can bus pcb in side. Where did you get your pcb board from again?
I would really appreciate your help. I’m getting close to blowing a gasket lol

[kryszczuk]

The link is not working anymore. Can you post the name of the vendor please, if you can recall?

[Beirdo]

Did the replacement one (by any chance) come with schematics in the manual? I'm an electrical engineering type, and wouldn't mind seeing how it works.

[guzzura]

Ciao sono Flavio
Mio thermotop C (scheda guasta) dove comprare questa nuova scheda ?

[Bennyboy-dog]

Sophisticated electronics is being used to protect their lucrative spare parts market. Fight the bastards, buy the hungarian ebay unit!

[jamiesony]

love the arduino ecu idea. I have thought about this so we can use bluetooth/wifi to control with android, never got round to it so far but made a few BT lighting controllers for android with MIT app inventor, a great, simple, online app development tool. interested in how the controller signals to the heater. Maybe PWM? Great videos, keep up the good work :) respect fae the bonnie scottish highlands (y)