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Defendertomten

Member Since: 19 Aug 2020
Location: Avesta
Posts: 48

2000 Defender 130 Td5 HCPU Coniston Green

Thermo top c fbh weird problem

When activated on the flame button it just beeps and spins the fan like five seconds then starts over. Guess the beeping
sound is when fan starts. Seems run smooth though. No fan bearing problem.
Can i have bricked the onboard ecu when i tried to connect with webasto diagnose? Or is it some other known
problem? Land Rover owner since 2003
2008 Disco3 manual
2000 Defender 130 td5 snorkel warn m6000

21st Aug 2020 7:14am

jocklandjohn

Member Since: 16 Sep 2016
Location: Highlands
Posts: 62

I don't have one but have an Eberspacher which does the same job.

Have you done any radiator work and got air in the system? Can you run the engine and bleed the system to remove any air bubbles

Doubt that the diagnostic unit has harmed it. Is the air intake clear? Is it getting enough fuel? Is the fuel line blocked?

Do you actually have a diagnostic unit?

2nd Sep 2020 8:39pm

Defendertomten

Member Since: 19 Aug 2020
Location: Avesta
Posts: 48

I have bled the intake with pressurized air so its free intake.
The webasto diagnostic was a china copy i borrowed and didnt work on my other webasto V either.
I have not checked the fuel supply though. But is there a fuel pressure sensor in the thermo top?
Otherwise it would have started up but not ignite burner?
Seems like it have got caught in a loop. Land Rover owner since 2003
2008 Disco3 manual
2000 Defender 130 td5 snorkel warn m6000

4th Sep 2020 7:07am

jocklandjohn

Member Since: 16 Sep 2016
Location: Highlands
Posts: 62

Unless there's a major problem with the diagnostic unit I doubt its caused any damage. Does the other Webasto still work after attaching the Chinese unit to it?

Don't know if there's a fuel pressure sensor - may just be a flame sensor that detects the fuel burning. See the manual for this info on this - the glow plug/flame sensor combo does this apparently: https://www.butlertechnik.com/downloads/We...al_(2).pdf Item 2.2

Given the number of things that might be wrong - dosing pump for fuel delivery, a defective sensor, defective ECU, worn out glow pin, etc etc (ALL of which I have had to replace on my Eberspacher unit over the years) it might save you a lot of grief to pay a Webasto dealer to attach a proper Webasto diagnostic unit to it - once you have a read-out of the problem you can tackle the repair on your own.

I suppose as a simple next step, remove the power supply and unplug completely, then try a restart. Is the dosing pump a separate unit or integral? If its separate check the power connections to it and that the fuel is flowing (Eberspacher fuel line is clear so you can see it flowing - is yours clear?)

4th Sep 2020 7:28am

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