1322585A Diesel Burner Insert For Webasto Air Top 2000STC 2000ST

White Smoke, Soot Build-Up, and Error 00010 — It Is Probably the Burner Insert

You fire up the cab heater. The blower starts. The glow plug cycles. Combustion begins — and instead of clean heat, you get a cloud of white smoke that smells half-burnt. Or you get visible soot on the exhaust outlet. Or the heater starts, runs for two minutes, and locks out with F 00010 “overheat” or F 00011 “flame sensor” errors. If that description matches what is happening in your Webasto Air Top 2000ST or 2000STC, the part that has almost certainly failed is the diesel burner insert (OEM 1322585A).

The burner insert is where the diesel, glow plug, and combustion air meet. It is the part that converts cold diesel into clean, even combustion. When the burner insert wears, combustion becomes incomplete. Soot forms. The flame sensor misreads. The ECU shuts the heater down to protect itself.

IntelliGenParts supplies an OEM-equivalent 1322585A burner insert at a fraction of dealer cost. Same single-pore design, same integrated 12V glow plug, same gasket specification. Built to install in 20-30 minutes with basic hand tools. No diagnostic tool required to verify the install — a successful cold start is the test.

What the Burner Insert Does

The burner insert in a Webasto Air Top 2000ST diesel heater is a precision-machined assembly that performs three tightly coupled functions:

• Fuel atomization. The single-pore design meters diesel into the combustion chamber at the exact flow rate the ECU demands. A worn pore oversupplies fuel, causing soot.
• Ignition. The integrated 12V glow plug brings the diesel to ignition temperature within 12 seconds of start-up. A worn glow plug takes longer, causes hard starts, and trips F 00012.
• Combustion stabilization. The insert geometry creates a stable flame pattern that the flame sensor can read. A worn insert produces a wandering flame that the sensor cannot lock onto, tripping F 00011.

The burner insert is a wear item. Every combustion cycle slowly erodes the glow plug, the pore, and the gasket surface. At 1,500-2,000 hours of cumulative run time, the insert is typically worn enough to cause measurable performance loss.

Symptoms of a Failing Burner Insert

The 1322585A insert rarely fails suddenly. It gives you warnings weeks in advance. Here are the five most common:

1. White Smoke on Cold Start

Unburnt diesel vapor escaping the combustion chamber. Caused by an oversize fuel pore (wear) or a weak glow plug (carbon build-up or open coil). Visible as a thick white cloud for 10-30 seconds after start-up. Should clear once the heater is at operating temperature — but it does not clear on a worn insert.

2. Soot Around the Exhaust Outlet

Black carbon deposits on the exhaust pipe and around the heater’s exhaust port. Caused by incomplete combustion. The fuel is being delivered but not fully burned. The insert geometry is worn, the pore is oversized, or the glow plug is too weak to ignite the mixture properly.

3. Error F 00010 — Overheat Lockout

The ECU monitors combustion temperature via the flame sensor. If combustion is unstable (worn insert) the temperature spikes, the ECU sees it as a safety risk, and locks the heater out. F 00010 is more often a burner insert issue than an actual overheat condition.

4. Error F 00011 — Flame Sensor / Combustion Quality

The flame sensor cannot lock onto a stable flame signal. On a healthy heater the flame signal is steady. On a worn insert the signal fluctuates or drops out, the ECU interprets it as a flame failure, and aborts the cycle.

5. Hard Starting, Especially in Cold Weather

The glow plug takes longer to bring the diesel to ignition temperature. Starting time stretches from 60 seconds to 3-4 minutes. In extreme cold, the heater fails to start at all. The glow plug portion of the insert is worn, or the fuel pore is partially blocked by carbon.

Compatible Webasto Models

Not compatible with gasoline (Air Top 2000S) variants. The gasoline burner uses a different part number (1311059A).

Technical Specifications

Installation Guide (7 Steps, 20-30 Minutes)

Tools required: T20 Torx driver, T15 Torx driver, 10 mm open-end wrench, flat-blade screwdriver, nitrile gloves, clean lint-free rags, small inspection mirror.

⚠️ Safety First

• Disconnect both battery terminals. The glow plug is wired directly to the battery via the ECU. A short during install is a fire risk.
• Allow the heater to fully cool. The combustion chamber and burner insert stay hot for up to 15 minutes after shut-down. Burns are the most common installer injury.
• Cap the fuel line. A diesel leak on the shop floor is a slip hazard and an OSHA reportable in commercial shops.
• Do not touch the glow plug coil. Skin oils cause hot spots and premature failure. Hold the insert by the steel housing only.
• Replace the gasket every time. The included gasket is single-use. Reusing an old gasket causes combustion leaks and false-air issues.

Step 1 — Remove the Heater (Recommended)

While in-place replacement is possible, removing the heater to a clean bench dramatically reduces the risk of debris entering the combustion chamber. Disconnect the fuel line, the wiring harness, the ducting, and the mounting bolts.

Step 2 — Open the Heater Casing

Remove the eight T20 Torx screws around the lower housing flange. Separate the upper and lower halves gently. Set the gasket aside — you will need a new one (included with the 1322585A).

Step 3 — Locate the Burner Insert

The burner insert sits in the centre of the lower housing, mounted to a retaining plate with two T15 screws. The glow plug wire is short — do not strain it.

Step 4 — Disconnect the Glow Plug Wire

Pull the glow plug connector straight off the terminal. Do not tug on the wire. Inspect the connector for corrosion. If the connector is green or pitted, clean it with electrical contact cleaner before reassembly.

Step 5 — Remove the Old Burner Insert

Remove the two T15 retaining screws. Lift the insert straight out. Inspect the old insert — heavy carbon build-up on the glow plug sheath confirms combustion quality issues. Inspect the combustion chamber for soot. Wipe clean with a lint-free rag. Do not use solvents.

Step 6 — Install the New 1322585A Insert

Place the new gasket on the combustion chamber opening. Drop the new insert into position, aligning the locating pin. Reinstall the two T15 screws to 2.5 Nm. Reconnect the glow plug wire until it clicks.

Step 7 — Reassemble and Test

Re-seat the casing gasket (use the new one if the old is hardened). Reinstall the eight T20 screws in a star pattern to 4 Nm. Reinstall the heater. Reconnect the battery. Run a cold start. A successful install shows clean exhaust within 30 seconds, no white smoke, no error codes. Run for 15 minutes, then re-check.

Why Choose IntelliGenParts?

• OEM-equivalent build quality. Stainless steel chamber, Inconel glow plug sheath, single-pore jet — same materials, same tolerances as the dealer part.
• 12-month warranty. Full replacement if the insert fails within a year — no diagnostic hoops, no restocking fees.
• $45-65 vs. dealer $130-180. That is 60-70% off the dealer price without giving up the warranty or the build quality.
• Bulk pricing for workshops. Wholesale tier for orders of 10+. Email raven@intelligenparts.cn for a quote.
• Same-day shipping. From our European and North American warehouses. Most orders ship same business day.
• Bilingual technical support. English and German, 9 AM-6 PM CET, Monday to Friday.

Cross-References — Related Parts in Our Catalog

• 1303846A — Blower motor for Air Top 2000ST / 2000STC. If the heat exchanger is sooted, the blower is often the next failure.
• 82306B — 24V glow pin for Air Top 2000 24V variants (if you also service commercial trucks).
• 1322644C — 24V glow pin + flame sensor for Thermo 90 / 90ST (water heaters).
• Fuel filter — Always replace when working on a diesel heater. Contaminated fuel is the #1 cause of premature insert failure.

Frequently Asked Questions

Q: Will this fit my 2007 Webasto Air Top 2000ST?

Yes. The 1322585A part number covers all 2000ST and 2000STC diesel models from 2005 onward. The geometry has not changed.

Q: Do I need to replace the glow plug separately?

No. The glow plug is integrated into the 1322585A insert. Replacing the insert replaces the glow plug. If you only need a glow plug (without the combustion chamber), use a standalone glow pin like the 82306B.

Q: What is the difference between 1322585A and 1302799A?

They are cross-references for the same burner assembly. The 1302799A is the older part number, superseded by 1322585A. Both fit the same heaters.

Q: My heater has white smoke — is the insert the problem?

White smoke on cold start is most often a worn burner insert, a weak glow plug, or contaminated diesel. If the smoke clears after 30 seconds and the heater runs cleanly, the insert is probably fine. If the smoke persists, replace the insert.

Q: Can I clean the old insert and reuse it?

You can clean heavy carbon off the glow plug sheath with a soft brass brush, but you cannot restore a worn fuel pore. If the pore is visibly oversized or the glow plug coil is open (tested with a multimeter), the insert is scrap.

Q: What is the typical service life?

1,500-2,500 operating hours under normal conditions. In a typical RV that means 3-5 winters. In a commercial vehicle running daily, expect 1-2 years.

Q: Do you have a 24V version?

Yes. We stock 24V burner inserts for 2000ST 24V variants. The 12V and 24V glow plugs are not interchangeable — using a 12V insert on a 24V system will burn the glow plug in minutes.