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[Solved] Scania R 420 2007 Euro 5: Eberspacher Airtronic D4 Auxiliary Heating - Heater Error & ATA Codes

pompa354 16074 11
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  • #1 16917905
    pompa354
    Level 9  
    Posts: 78
    Rate: 17
    Hello, I have a problem with the parking heater in Scani r420 2007 euro 5. After turning on the stove, the fan works for five seconds and the info on the remote control pops up, heater error, then you hear beeping and the stove stops working. I checked the fuel pump and it looks like it does not get an impulse from the controller and does not give fuel. The errors that popped up are ATA 112 and ATA 120 and after moving the power plug an ATA 148 error appeared, can someone tell me what these error codes mean because I can not find. The furnace is Eberspacher Airtronic M, D4. Thank you very much
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  • #2 16934990
    pompa354
    Level 9  
    Posts: 78
    Rate: 17
    Please help me only with the ATA 120 error
    I don't know what it means and I can't look for information on it anywhere. The heating will turn on the fan three times for a short while and soon it starts squeaking and a heater error pops up. Please give me a hint
  • Helpful post
    #3 16935637
    mariomalinie
    Level 19  
    Posts: 201
    Help: 32
    Rate: 166
    Hello.
    ATA120
    A short circuit in the glow plug circuit. Check the candle. Resistance about 2 Ohm.
  • #4 16937639
    pompa354
    Level 9  
    Posts: 78
    Rate: 17
    Hello, thanks for the hint, the candle was actually to be replaced, but now an ata 133 error has appeared :( the fan starts fifteen times and squeaks again and a heater fault pops up. The fuel pump does not get an impulse and it seems to me that it is working, because when connected to the rectifier, you can hear that it speaks. Please, give me some hint what this error is
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    • Scania R 420 2007 Euro 5: Eberspacher Airtronic D4 Auxiliary Heating - Heater Error & ATA Codes 20180105_122008.jpg (3.8 MB) You must be logged in to download this attachment.
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  • #5 16939167
    mariomalinie
    Level 19  
    Posts: 201
    Help: 32
    Rate: 166
    Hello
    ATA 133- Combustion air fan impeller not moving. Fan impeller blocked, rotating too fast, or no magnet in it. Most often, the engine to be replaced.
  • #6 16943012
    pompa354
    Level 9  
    Posts: 78
    Rate: 17
    I checked the fan motor by connecting the 1.5v battery and the fan works without any problems, after stopping by hand, it unscrews without noticeable abrasions or any resistance to play on the bearings, and you do not feel it.
    I wonder if the driver would be blocked by several unsuccessful firing attempts, it is possible that it shows, for example, a fan error? or maybe there is another reason why this error pops up. Is it possible to unlock the controller at home without having diagnostic equipment?
  • #7 16943804
    mariomalinie
    Level 19  
    Posts: 201
    Help: 32
    Rate: 166
    Hello
    Often this error occurs when the brushes in the fan motor are running low. After hitting the engine, it works for some time, but it may not reach the set RPM, and then an error appears.
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  • #8 16943843
    pompa354
    Level 9  
    Posts: 78
    Rate: 17
    Hello, I am surprised that after turning on the heating, the fan starts to start fifteen times, about 3 seconds at high speed and does not give an impulse to the fuel pump, then a heater error pops up and that's all. Can running brushes have an impact on these symptoms?
  • #9 16944508
    mariomalinie
    Level 19  
    Posts: 201
    Help: 32
    Rate: 166
    With such symptoms, I always replace the engine plus inspection and cleaning of the entire device and the topic ends for the next few years.
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  • #10 16944525
    pompa354
    Level 9  
    Posts: 78
    Rate: 17
    Ok. I'll have a look at that motor tomorrow
  • #11 16948312
    SP7SEC
    Level 29  
    Posts: 1011
    Help: 110
    Rate: 407
    As I know this device, 99 percent of the engine and the burner are to be replaced, this is their problem, the manufacturer provides for 2500 to 3000 hours of work and replacement
  • #12 17269624
    pompa354
    Level 9  
    Posts: 78
    Rate: 17
    Hello, I replaced the motor because the brushes were actually running out and it's ok, Thanks for your help
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Topic summary

✨ The discussion revolves around a malfunctioning Eberspacher Airtronic D4 auxiliary heater in a 2007 Scania R 420 Euro 5 truck. The user reports that the heater displays an error after a brief operation, with specific ATA error codes: ATA 112, ATA 120, and ATA 133. Responses indicate that ATA 120 signifies a short circuit in the glow plug circuit, while ATA 133 suggests issues with the combustion air fan impeller. The user replaces the glow plug and later the fan motor due to worn brushes, resolving the heater's operational issues. The importance of inspecting and potentially replacing the fan motor and burner is emphasized, as these components typically have a limited operational lifespan.
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FAQ

TL;DR: If your Scania R420’s Eberspächer Airtronic D4 beeps then stops, the fix is usually the fan motor; these heaters are rated ~2,500–3,000 hours. “99 percent of the engine and the burner are to be replaced.” [Elektroda, SP7SEC, post #16948312]

Why it matters: This FAQ helps drivers and techs quickly decode ATA errors and choose the fastest fix without guesswork.

Quick Facts

What does ATA 120 mean on an Airtronic D4, and how do I confirm it?

ATA 120 flags a short circuit in the glow plug circuit. Pull the glow plug and measure resistance at room temperature; about 2 Ω indicates a healthy element. Replace the glow plug if shorted or out of spec, clear codes, and retest the start cycle. “A short circuit in the glow plug circuit. Resistance about 2 Ohm.” [Elektroda, mariomalinie, post #16935637]

What does ATA 133 mean and what usually fixes it?

ATA 133 means the combustion air fan impeller is not moving correctly. Causes include blockage, over‑speed sensing, or a missing rotor magnet. The common corrective action is replacing the fan motor assembly and inspecting for debris. Many shops treat motor replacement as the durable fix. [Elektroda, mariomalinie, post #16939167]

My heater’s fan starts repeatedly but the fuel pump never clicks—why?

The controller won’t pulse the fuel pump until it verifies proper fan RPM and airflow. Repeated brief high‑speed spins followed by a fault usually trace to the fan motor or its sensing. Fix the fan issue first; fuel delivery resumes once conditions pass checks. [Elektroda, pompa354, post #16943843]

Can worn brushes cause start–stop behavior on the Airtronic D4 fan?

Yes. Low or uneven brushes can make the fan run intermittently, fail to reach target RPM, and then fault. A temporary tap may revive it briefly, but replacement is the reliable fix. “After hitting the engine, it works for some time.” [Elektroda, mariomalinie, post #16943804]

The fan runs fine on a 1.5 V battery—could the controller be locked out?

The thread raised lockout as a possibility but did not confirm a DIY unlock. Bench tests at 1.5 V don’t validate RPM sensing under load. Use proper diagnostics and address fan motor condition first before suspecting lockout. [Elektroda, pompa354, post #16943012]

How long do these heaters typically last before major parts are due?

One experienced poster cites manufacturer guidance of roughly 2,500–3,000 operating hours for engine/burner replacement. Plan maintenance around that figure to avoid in‑season failures. This is a practical lifecycle statistic for fleet planning. [Elektroda, SP7SEC, post #16948312]

What ultimately fixed the OP’s Scania R420 heater in this thread?

Replacing the fan motor solved the repeated start attempts and restored normal operation. The owner confirmed the brushes were worn down and reported the heater works fine after motor replacement. [Elektroda, pompa354, post #17269624]

Are ATA 112 or ATA 148 explained in this discussion?

No. The original post lists ATA 112 and ATA 148 alongside 120, but only 120 and 133 were decoded here. Use a service tool or manual for 112/148 specifics. [Elektroda, pompa354, post #16917905]

What quick checks should I do for a no‑heat with beeps on Airtronic D4?

Check glow plug resistance near 2 Ω, inspect wiring for shorts (ATA 120). Listen for fan spin‑ups; if it cycles then faults, suspect the fan motor (ATA 133). Do not expect fuel‑pump ticks until the fan passes RPM checks. [Elektroda, mariomalinie, post #16935637]

Is replacing the fan motor a long‑term fix?

Yes. A veteran tech says replacing the motor plus inspection and cleaning resolves recurring faults for years. This approach prevents marginal RPM from triggering new errors. “Replace the engine plus inspection and cleaning…and the topic ends.” [Elektroda, mariomalinie, post #16944508]

How do I clear repeated fan‑related faults the straightforward way?

  1. Replace the combustion‑air fan motor with a quality part.
  2. Inspect and clean the entire heater assembly and burner.
  3. Clear codes and run several full heat cycles to verify stable RPM. “Replace the engine plus inspection and cleaning…” [Elektroda, mariomalinie, post #16944508]

Why does the heater attempt up to fifteen brief starts, then quit?

That pattern points to the controller trying to validate fan RPM multiple times. After repeated failures, it throws a heater error and halts without fueling. Address the fan motor and airflow path to stop the loop. [Elektroda, pompa354, post #16943843]

What is the Eberspächer Airtronic D4 in simple terms?

It’s a 24 V diesel-fired air heater used as an auxiliary/parking heater. It burns small amounts of fuel to heat cabin air and runs an electric fan for airflow. The thread covers common D4 faults and fixes. [Elektroda, pompa354, post #16917905]

What is an ATA code in this context?

ATA codes here are heater fault indications shown on the controller/remote. They map to specific subsystems like the glow plug or fan. In this thread, ATA 120 and 133 were decoded and resolved. [Elektroda, pompa354, post #16917905]
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