Compatible Glow Pin 82306B for Webasto Air Top 2000 24V- Glow Plug Replacement

24V Truck Heater Will Not Start in the Morning? The Glow Pin Is the Usual Suspect

It is -20°C at a truck stop outside Calgary. A long-haul driver climbs into the cab of a Volvo FH or a Scania R, hits the heater start switch, and waits. The blower runs, the fuel pump clicks, the glow plug cycles — but there is no flame. No combustion. The diagnostic tool shows F 00012 “ignition failure” or no error code at all. The cab is cold. The driver is late. The load is waiting.

If that is what is happening in your Webasto Air Top 2000 24V C or C-GL, the part that has almost certainly failed is the glow pin (OEM 82306B). The Air Top 2000 24V is the workhorse air heater under the cabs of thousands of European commercial trucks. The glow pin is its single most failure-prone component in cold weather. It is a wear item, and a 24V system stresses it harder than a 12V system because the heater cycles more frequently in commercial use.

IntelliGenParts supplies an OEM-equivalent 82306B at a fraction of dealer cost. Same 24V ceramic specification, same connector, same dimensions, same 12-second heat-up time. Built to install in 15-20 minutes with basic hand tools. No diagnostic tool required — a successful cold start is the test.

What the Glow Pin Does

The 82306B glow pin in a Webasto Air Top 2000 24V is a ceramic-rod ignition element. It is one of the simplest and most load-bearing parts in the heater:

• Cold-start ignition. The ceramic element heats the air-fuel mixture in the combustion chamber to ignition temperature within 12 seconds of start-up. The element reaches 1,000°C+ in that window, hot enough to ignite the diesel-air mixture.
• Flame stabilization during start-up. For the first 30-60 seconds of operation, the glow pin stays hot to help stabilize the flame while the combustion chamber warms up. Once combustion is self-sustaining, the plug cycles off.

That is the entire job description. But the glow pin is the only part in the heater that goes from room temperature to 1,000°C in 12 seconds, every single time the heater starts. In a 24V commercial system, the glow pin is also under more electrical stress than a 12V plug because the heating element has to handle higher voltage transients. Over thousands of cycles, the element degrades. It is a wear item with a finite life.

Symptoms of a Failing Glow Pin

The 82306B rarely fails silently. It gives you weeks of warning. Here are the five most common symptoms:

1. Hard Starting, Especially in Cold Weather

The classic symptom on the Air Top 2000 24V. The glow pin cannot reach ignition temperature in the time the ECU allows. Start time stretches from 60 seconds to 3-5 minutes. In extreme cold (-20°C and below), the heater fails to start at all. The driver is stranded with a cold cab.

2. Error F 00012 — “Ignition Failure”

The ECU attempts to ignite, does not see a stable flame within the start window, and aborts. F 00012 is stored in the diagnostic log. On the Air Top 2000 24V, F 00012 is almost always the glow pin, not the ECU.

3. No Combustion, No Error Code

The most confusing symptom on the 24V Air Top 2000. The blower runs, the fuel pump clicks, the glow plug cycles — but there is no flame. No F-code, no overheat, nothing. The ECU has not detected a fault because the plug circuit is technically complete. This pattern is diagnostic for the glow pin.

4. Heater Starts After Multiple Attempts

First attempt fails. Second attempt fails. Third attempt, the glow pin finally reaches temperature, and combustion begins. This is the classic “intermittent” failure mode — the ceramic element is cracked, makes partial contact, and only works when it gets hot enough to expand into a working position.

5. Visible White Smoke and Unburnt Diesel Smell

The glow pin is too weak to fully ignite the mixture. Diesel vapor escapes unburnt. The exhaust smells of raw diesel. The heater may run in a derated state or cycle on and off every few minutes.

Compatible Webasto Models

Not for 12V systems. We stock a 12V variant of the same glow pin — check the catalog or email us if you are unsure which voltage your heater runs.

Technical Specifications

Installation Guide (6 Steps, 15-20 Minutes)

Tools required: T20 Torx driver, 8 mm and 10 mm open-end wrenches, flat-blade screwdriver, multimeter (for testing the old plug), nitrile gloves, clean lint-free rags.

⚠️ Safety First

• Disconnect both battery terminals. 24V commercial systems have high available current. A short during install is a serious fire risk.
• Allow the heater to fully cool. The combustion chamber and glow pin stay hot for up to 10 minutes after shut-down.
• Cap the fuel line. A diesel leak on the shop floor is a slip hazard.
• Do not touch the new glow pin with bare fingers. Skin oils cause hot spots and premature failure. Hold the new plug by the metal connector end only — use the gloves.
• Do not over-torque the mounting nuts. The ceramic glow pin is brittle. Over-tightening cracks the element.

Step 1 — Remove the Heater (Recommended)

Most Air Top 2000 24V installations are under the cab or in the engine bay compartment. 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 — Access the Glow Pin

The glow pin is accessed by removing the combustion air intake cover (typically four T20 screws). The glow pin is the cylindrical part protruding into the combustion chamber, with two M4 studs on top for the wiring.

Step 3 — Disconnect the Wiring

Remove the two M4 nuts (8 mm wrench) holding the glow pin wires to the studs. Lift the wire terminals off. Inspect the terminals for corrosion. If either is green or pitted, clean it with electrical contact cleaner before reassembly.

Step 4 — Test the Old Glow Pin (Optional but Recommended)

Use a multimeter to measure the resistance across the two M4 studs. A healthy 24V glow pin reads 1.5-3.0 ohms. Infinite resistance means the coil is open. Out-of-range resistance means the element is degraded.

Step 5 — Remove and Install the New Plug

Unscrew the mounting nut (10 mm) holding the glow pin to the burner. Withdraw the old plug straight out. Drop the new 82306B into the mounting hole. Hand-tighten the mounting nut, then torque to 3 Nm (do not over-tighten). Reinstall the two M4 nuts on the studs, torqued to 2 Nm.

Step 6 — Reassemble and Test

Reinstall the combustion air intake cover (four T20 screws, 2.5 Nm). Reinstall the heater in the vehicle. Reconnect the fuel line, ducting, and battery. Run a cold start. A successful install shows clean combustion within 60-90 seconds, no white smoke, no error codes. Run for 15 minutes, then re-check the diagnostic log.

Why Choose IntelliGenParts?

• OEM-equivalent build quality. Ceramic silicon nitride element, Inconel 600 sheath — same materials and tolerances as the dealer part.
• 12-month warranty. Full replacement if the plug fails within a year — no diagnostic hoops, no restocking fees.
• $20-35 vs. dealer $50-80. That is 55-65% off the dealer price.
• Bulk pricing for workshops. Wholesale tier for orders of 20+. Email raven@intelligenparts.cn for a quote.
• Same-day shipping. From our European and North American warehouses.
• Bilingual technical support. English and German, 9 AM-6 PM CET, Monday to Friday.

Cross-References — Related Parts in Our Catalog

• 1303846A — 12V blower motor for Webasto Air Top 2000ST 12V (12V equivalent system).
• 1322585A — Diesel burner insert for Air Top 2000ST / 2000STC (replace at the same time if combustion chamber is sooted).
• 1322644C — 24V glow pin + flame sensor for Webasto Thermo 90 / 90ST (water heater, Webasto equivalent).
• Fuel filter — Always replace when working on a diesel heater.

Frequently Asked Questions

Q: Will this fit my 2005 Webasto Air Top 2000 C 24V?

Yes. The 82306B part number covers all Air Top 2000 24V C and C-GL variants from 2000 onward. The 24V specification and connector are unchanged.

Q: What is the difference between 82306, 82306A, and 82306B?

The 82306B is the current production version, superseding the 82306A and the original 82306. The B suffix indicates the current revision. All three are cross-compatible. The ceramic composition in the B version is improved for longer service life.

Q: My heater has F 00012 — is the glow pin the problem?

Most likely yes. F 00012 on an Air Top 2000 24V is almost always a glow pin or burner insert issue. Check the glow pin resistance first. If the pin reads 1.5-3.0 ohms, the issue is more likely the burner insert or fuel delivery.

Q: Can I install a 12V version in my 24V system?

No. The 12V and 24V glow pins are not interchangeable. The 24V glow pin has a different coil resistance (1.5-3.0 ohms vs 0.3-0.6 ohms for 12V). Using a 12V pin on a 24V system will cause the coil to burn out in minutes.

Q: What is the typical service life?

2,000-3,000 operating hours under normal conditions. In a typical commercial truck running the heater 1-2 hours per shift, that means 3-5 years. Long-haul trucks running the heater overnight will see shorter service intervals.

Q: Do you have a wholesale price for fleet operators?

Yes. Tiered wholesale starts at 20 units. Larger fleet and distributor pricing is available. Email raven@intelligenparts.cn with your company details and expected monthly volume.