Flue Gas Extractor GR01725 Boiler ZW23-1 AE - Ref. 8707204038
The flue extractor evacuates the combustion gases and creates the necessary draft for the Baxi Roca ZW23-1 AE boiler to start, with this part identified by the reference 8707204038. When it fails, the boiler does not ignite or locks out due to a problem in the flue gas evacuation, which can manifest with fault codes C1, C6, or CA. This extractor is compatible with models from the Euroline range, such as the ZW23-1 AE and the ZW24-1E LH AE, among others. It should be replaced when these symptoms or fault codes are detected.
VAT included
Consult via WhatsAppJunkers boilers compatible with reference 8707204038
Extractor with reference 8707204038. Two confirmed compatibilities: ZW23-1 AE and ZW24-1E LH AE.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Junkers ZW23-1 AE | Euroline | Contrasted |
| Junkers ZW24-1E LH AE | Euroline | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if ref. 8707204038 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 8707204038. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the extractor 8707204038 resolves.
The extractor evacuates the combustion gases with forced draft. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler tries to ignite but the fan does not start, or it struggles a lot, and it gets locked.
Cause: The motor is dirty or the bearing is seized and does not reach the necessary speed for the control board to allow the gas to flow.
With the boiler unplugged, turn the turbine by hand: if you feel friction or it stops abruptly, it is a clear indication before replacing the part.
- 02
The fan makes a strange noise, like a buzzing or metallic rubbing, when the boiler is on.
Cause: It is usually the turbine being unbalanced due to dirt accumulation on the blades, or a worn bearing rubbing against the housing.
Check if the blades have dust, soot, or caked grease; cleaning them sometimes resolves the noise without replacing the extractor.
- 03
The boiler locks out and shows a fault related to flue gas evacuation.
Cause: The fan does not generate enough draft for the air pressure switch to confirm the flow, and the control unit cuts off ignition for safety.
Check that the flue is not blocked by ice, nests, or dirt before assuming it is the fan.
- 04
The fan rotates, but it seems slower or with less force than before.
Cause: The motor loses RPM when the bearing starts to seize or the winding degrades with use.
Compare the sound and the rotation speed with what it was when the boiler was working well; a noticeable drop points to the fan.
Fault codes from Junkers that this part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| C1 | The pressure switch opens during operation, or the fan speed is too low. | If the extractor fan does not reach the expected RPM or flow rate, the pressure switch opens during operation and triggers C1; check the power supply to the fan and the tachometric signal, and confirm that the pressure switch closes with the fan running and ducts clear. |
| C6 | The pressure switch does not close. | A blocked/faulty fan or one with low flow does not generate the necessary depression and the air pressure switch does not close; check the fan start-up, closure of the pressure switch with a micromanometer, and the condition of the pressure switch/exhaust tubes. |
| CA | Turbine revolutions too high. | Fan/tachometer fault causes the electronics to detect RPM out of range (excessive); verify actual RPM reading, tachometer wiring, and mechanical condition of the fan/extractor. |
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Junkers 8707204038 extractor datasheet
- Catalogue reference
- 8707204038
- Brand
- Junkers
- Type of part
- Extractor fans
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Manufacturer code
- GR01725
- Marked
- CE
Frequently asked questions about the extractor 8707204038
What is the reference for the flue gas extractor of the boiler ZW23-1 AE?
What are the boiler models compatible with the extractor GR01725?
What fault codes are documented for the extractor GR01725?
When should I consider replacing the extractor of my boiler?
What reference should I look for if I need a spare part for the extractor of my boiler ZW23-1 AE?
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