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Webasto Parking Heater Not Turning On: Audi A6 C6 3.0 TDI, Troubleshooting & Replacement Options

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  • #1 17502210
    kilun1
    Level 10  
    Posts: 186
    Help: 5
    Rate: 64
    Hello. I bought an audi with the option of parking heating but I don't want to move in any way. I programmed in the menu, however, does not turn on. If you set ventilation, it will start, but you don't want to heat. When switching the PARKING HEATING ON / OFF option after changing to the ON position, after a second it changes to OFF. I replaced the batteries in the remote control, however, the green LED will light up for a second, then the red blinks quickly as in the remote control of the castle when there is no contact with the car. I read something there, that if it is warm it will not start webasto, however, today was only 6 degrees and still silence. Is it worth it to resuscitate or simply buy used on the allegro? A lot of things there that can refuse to obey? Is there hope that when the outside temperature drops below 5 deg. The stove will start? Thank you for your interest.


    Moderated By szymitsu21:

    I have corrected the spelling, please pay attention to it in subsequent posts.
    3.1.13. Take care of language correctness and keep the rules of netiquette. Do not send messages from which it is difficult to deduce what their author wanted to convey.

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  • #2 17502436
    marcin.koz2910
    Level 27  
    Posts: 913
    Help: 91
    Rate: 386
    there are a lot of themes that could fly, if you do not want to spend money in the dark and buy other aggregates without sense, I recommend first connecting the webasto to the computer (if factory, after VAG should be able to read the errors) and see what the fault is reporting

    To start with, you can find a fuse from it and turn it off for a while (or disconnect the battery)
  • #3 17502502
    kilun1
    Level 10  
    Posts: 186
    Help: 5
    Rate: 64
    It is original webasto disconnecting the battery has not helped anything. I'll drive to the computer tomorrow then. What about the outside temperature? Not affected?
  • #4 17503221
    marcin.koz2910
    Level 27  
    Posts: 913
    Help: 91
    Rate: 386
    If this is not an engine additional heater and full-fledged parking heater then it should not be a problem
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  • #5 17503239
    andrzej20001
    Level 43  
    Posts: 17695
    Help: 1568
    Rate: 6610
    It starts from 4 deg. Down
  • #6 17503242
    kilun1
    Level 10  
    Posts: 186
    Help: 5
    Rate: 64
    Well, at least it was 6 o'clock so I have to wait before I start rummaging maybe it works
  • #7 17503757
    andrzej20001
    Level 43  
    Posts: 17695
    Help: 1568
    Rate: 6610
    Tyszer rummaged in my and at 4 fired :)
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  • #8 17532875
    kilun1
    Level 10  
    Posts: 186
    Help: 5
    Rate: 64
    Unfortunately, the temperature dropped, the heating does not work. The computer displays a short circuit in the positive lead from the circulation pump. Isn't it easier to buy the whole stove and change it? Can you make such a myk?
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  • #9 17533041
    _Megamax_
    Level 18  
    Posts: 236
    Help: 29
    Rate: 130
    For the parking heater to switch on, you need to have fuel in the tank and voltage on the battery terminals at the correct level.
  • #10 17533060
    kilun1
    Level 10  
    Posts: 186
    Help: 5
    Rate: 64
    I have no fuel A car drives every day :)
  • #11 17533115
    andrzej20001
    Level 43  
    Posts: 17695
    Help: 1568
    Rate: 6610
    Circulation pumps defective. It won't move
  • #12 17534424
    kilun1
    Level 10  
    Posts: 186
    Help: 5
    Rate: 64
    Unfortunately, the temperature dropped, the heating does not work. The computer displays a short circuit in the positive lead from the circulation pump. Isn't it easier to buy the whole stove and change it? Can you make such a myk?
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Topic summary

✨ The discussion revolves around troubleshooting a Webasto parking heater in an Audi A6 C6 3.0 TDI that fails to turn on. The user reports that while the ventilation function activates, the heating does not, and attempts to switch the parking heating on result in it reverting to off. Suggestions include connecting the heater to a computer for error diagnostics, checking the fuse, and ensuring proper battery voltage and fuel levels. It is noted that the heater should activate at temperatures below 4 degrees Celsius, but the user experiences issues even at 6 degrees. A short circuit in the circulation pump's positive lead is identified as a potential fault, leading to considerations of replacing the entire heater unit.
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FAQ

TL;DR: Audi A6 C6 parking heater issues often relate to the 4°C threshold; “It starts from 4 deg. down.” Use VAG diagnostics, check fuses, and fix pump/wiring faults before buying used units. This helps A6 3.0 TDI owners restore Webasto heat. [Elektroda, andrzej20001, post #17503239]

Why it matters: You avoid costly, unnecessary replacements by targeting the exact fault that blocks parking heat.

Quick Facts

What outside temperature triggers the Audi A6 C6 Webasto to start?

Auto-heat engages at or below 4°C. Above that, it won’t start automatically. “It starts from 4 deg. down.” If heating still doesn’t run below 4°C, look for stored faults. Manual parking-heat may also be blocked by faults. [Elektroda, andrzej20001, post #17503239]

Does ambient temperature block manual Parking Heating on a full parking-heater setup?

If your car has a full parking heater, ambient temperature should not prevent manual activation. If it still refuses to start, treat it as a fault condition and scan the system. This differs from auxiliary-only heaters that follow ambient thresholds. [Elektroda, marcin.koz2910, post #17503221]

My MMI flips Parking Heating from ON back to OFF—what does that indicate?

That behavior shows the system refuses activation. The menu toggles back to OFF when the heater won’t engage. Users reported ON switching to OFF within seconds. Proceed to fault reading and basic power checks next. [Elektroda, kilun1, post #17502210]

Ventilation works but heating doesn’t—what should I check first?

Focus on the heating path. A failed coolant circulation pump can block the heater from starting completely. Even with ventilation working, the heater will not run without proper pump operation. Inspect pump power and wiring before replacing parts. [Elektroda, andrzej20001, post #17533115]

How do I diagnose the Webasto without wasting money on parts?

Start with a scan and a power reset.
  1. Connect VAG/VCDS and read faults for the factory Webasto module.
  2. Note codes and live data, then clear and recheck.
  3. Pull the Webasto fuse or briefly disconnect the battery to reset, then retest. [Elektroda, marcin.koz2910, post #17502436]

Will disconnecting the battery clear Webasto faults?

A power cycle can reset the heater and clear transient lockouts. Pull the Webasto fuse or disconnect the battery briefly. This won’t fix a hard fault like a shorted pump. Always rescan after a reset to confirm persistent errors. [Elektroda, marcin.koz2910, post #17502436]

My scan shows “short circuit in the positive lead from the circulation pump”—what now?

Treat this as a wiring or pump failure. Inspect the pump connector, harness, and pump for damage. Repair wiring or replace the pump as needed. The heater will remain shut down until the short is resolved. Clear codes and retest afterward. [Elektroda, kilun1, post #17532875]

Do I need fuel and good battery voltage for the heater to switch on?

Yes. “For the parking heater to switch on, you need to have fuel in the tank and voltage on the battery terminals at the correct level.” Low voltage or fuel level blocks startup. Verify both before deeper troubleshooting. [Elektroda, Megamax, post #17533041]

Will it start once the outside temperature drops below 5°C?

Not if there is an active fault. The reported car still would not heat even after temperatures dropped. Once the underlying issue is fixed, the 4°C auto-start logic can work. Temperature alone won’t overcome hardware errors. [Elektroda, kilun1, post #17532875]

The remote flashes green, then blinks red fast—what does that mean?

That pattern matches a no-contact or failed handshake with the vehicle. The user observed a brief green LED, then rapid red blinks. Recheck pairing, signal, and whether the heater is permitted to start. Then scan for faults. [Elektroda, kilun1, post #17502210]

Is it smarter to replace only the pump or the whole Webasto unit?

Avoid buying a used heater blindly. First, read the errors to pinpoint the failure. If the code points to the pump circuit, repair that component instead of swapping the entire unit. Diagnose, then replace targeted parts. [Elektroda, marcin.koz2910, post #17502436]

Will a defective circulation pump stop the Webasto from running?

Yes. A failed pump prevents the heater from starting or circulating coolant. As one expert put it: “Circulation pumps defective. It won’t move.” Fix the pump issue before expecting successful starts. [Elektroda, andrzej20001, post #17533115]

It was 6°C outside and still nothing—does that tell me anything?

At 6°C, auto-heating will not engage due to the threshold. If manual parking heat also fails, suspect a fault. Record that temperature point in your diagnosis notes. Repair the fault, then test again near or below 4°C. [Elektroda, kilun1, post #17502210]

Can a quick “tinker” or reset get it to fire at 4°C?

Sometimes. One user reported success after tinkering and reaching 4°C. However, that won’t overcome a real fault like a shorted pump. Use resets only after recording codes and planning repairs. [Elektroda, andrzej20001, post #17503757]
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