Junkers PCB Netzmodul 8 748 301 077 for Junkers ZWR 24-3
Application to the exact variant pending confirmation. In the Junkers ZR/ZSR/ZWR -3, the Netzmodul and the Grundmodul or base module are two separate boards from the control box. This unit has the terminals L1, N1, and PE.
- Type of part
- Junkers
- Status
- Refurbished
- internal SKU
- PLC268
- Warranty
- 1 year
VAT included Stock · 1 unit
Compatible Junkers boilers
Junkers. 0 verified compatibilities. There are another 5 models that we are still checking.
Models pending verification
These models are associated with this reference, but we have not finished verifying them yet, so we do not consider them compatibleIf your boiler is one of them, send us a photo of the part you are going to replace and we will verify it before you purchase.
| Junkers ZR 18-3 and ZR 24-3 | Junkers | Unconfirmed |
|---|---|---|
| Junkers ZSR 18-3 and ZSR 24-3 | Junkers | Unconfirmed |
| Junkers ZWR 18-3 | Junkers | Unconfirmed |
| Junkers ZSR 8-3 | Junkers | Unconfirmed |
| Junkers ZWR 24-3 | Junkers | Unconfirmed |
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 it is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Look for the code 8 748 301 077 (also written as 8748301077) and the marking "1.1".
- Check the T1.25A printed fuse, the printing "12.5 A," and the terminals marked L1, N1, and PE.
- Don't confuse it with the Netzmodul 8 748 300 158 from the official list ZR/ZSR/ZWR 18/24-3: it's a different code.
- Look at the rating plate of your boiler, which is a Junkers ZWR 24-3, and note the full model.
- if they match, call us at 911 17 77 77 with the model of your boiler. Any questions? Send us a photo of the label of your part and the data plate of the boiler from Contact.
Symptoms that require diagnosis in the junkers
Common symptoms and faults
- 01
The boiler tries to ignite and locks out; there is no flame.
Cause: Gas supply issue during ignition or faulty ionization electrode.
Check that the gas valve is open. If the gas is flowing properly, have a technician check it.
- 02
B1 appears on the screen and the boiler does not detect the encoder connector.
Cause: Faulty or improperly inserted encoder connector.
Properly install the encoder connector. If the code returns, have a technician measure it and replace it.
- 03
E2 is displayed on the screen and the boiler detects a fault in the inlet NTC sensor.
Cause: NTC sensor interrupted or short-circuited, or defective connection cable.
Check the NTC sensor and its connection cable. If the fault code returns, have a technician check it.
Junkers fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| EA | There is no flame when turning on: ionization current is not detected. | Check that the gas valve is open. If the gas is flowing properly, the ionization electrode and its cable are the next steps. Have a technician check it. |
| FA | The boiler continues to detect ionization current after the shutdown command. | Have a technician check it: the gas valve and the ionization wiring need to be inspected. |
| A8 | Fault in the electronic circuit or communication with the regulator. | First, check the wiring to the regulator. Have a technician review it. |
| B1 | Encoder connector or fault in the electronic circuit. | Check that the encoder connector is properly mounted before replacing the PCB. |
| AC | There is a lack of connection with the control unit. | Check the cable to the control board before replacing the PCB. Have a technician check it. |
| E2 | Faulty NTC of the heating flow sensor. | Check the sensor and its wiring. If the sensor is fine, the PCB may be the cause. Have a technician check it. |
| B4 | Error in the encoder connector. | Check the encoder connector. If the code returns, have a technician review it. |
| C8 | Fault of the PCB. Reactivate after about 5 minutes. | If the fault code returns after resetting, have a technician check it. It points to the PCB. |
| C9 | Fault in the control board TA 210 E. | Check the connection with the control unit. If the issue persists, have a technician check it. |
| B7 | Fault in the electronic circuit. | If the fault code returns, have a technician check it. Point to the PCB. |
| B8 | Fault in the electronic circuit. | If the fault code returns, have a technician check it. Point to the PCB. |
| D8 | Fault in the electronic circuit. | If the fault code returns, have a technician check it. Point to the PCB. |
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.
Technical sheet: Junkers
- Uniclima internal SKU
- PLC268
- Brand
- Junkers
- Type of part
- Junkers
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Screen-printed fuse
- T1.25A
- Marked terminals
- L1;N1;PE
- Inventory — Visible condenser
- 6.2 μF, 275 V~ 0.22 μF, 275 V~
- Inventory — Visible thermal marking
- 70 °C/E
- Inventory — WIMA MKS 10 visible capacitor
- 1.0 μF, 350-
- Inventory — Visible blue subcomponent
- 230 V, 50/60 Hz
- Inventory — Application indicated in inventory
- ZWR 24-3
- Identification — Marked code
- 8 748 301 077
- Identification — Marked code
- 1.1
- Technical sheet: Screen-printed fuse
- T1.25A
- Technical sheet: Marked terminals
- L1;N1;PE
- Inventory data — Visible condenser
- 6.2 μF, 275 V~
- Inventory data — Visible thermal marking
- 70 °C/E
- Inventory data — Visible condenser
- 0.22 μF, 275 V~
- Inventory data — WIMA MKS 10 capacitor visible
- 1.0 μF, 350-
- Inventory data — Visible blue subcomponent
- 230 V, 50/60 Hz
- Inventory data — Application indicated in inventory
- ZWR 24-3
- Pending applications to verify
- ZWR 24-3 — noted compatibility; pending confirmation by variant. Registered application: for your product 10175 ("Junkers Secondary PCB (8748301077) v2"): Cerastar ZWR 24-3 MF; Cerastar ZWR 24-5 KE; Cerastar ZWR 24-6 KE; Cerastar ZWR 24-7 KE. Pending verification with the manufacturer's documentation for the reference and physical variant; this commercial statement does not certify compatibility or interchangeability.
Before purchasing
- A forum thread about a Cerastar ZWR 24-3 with frequent shutdowns due to faults and resets suggests replacing the Netzmodul, but does not confirm the cause, and its author suspected an ionization failure. Have a technician measure it before replacing it.
- To confirm: Junkers ZR 18-3 and ZR 24-3 — The official list shows 8 748 300 158 as the Netzmodul of the family. Confirmation recorded: this PCB is in the ZWR 24-3, so it is not ruled out; without additional confirmation, it links to this boiler.
- To confirm: Junkers ZSR 18-3 and ZSR 24-3 — The official list states 8 748 300 158 as the Netzmodul of the family. Confirmation recorded: this PCB is in the ZWR 24-3, so it is not ruled out; without additional confirmation, it is linked to this boiler.
- To confirm: Junkers ZWR 18-3 — The official list shows 8 748 300 158 (87483001580) as the Netzmodul of the family. Confirmation recorded: this PCB is in the ZWR 24-3, so it is not ruled out; without additional confirmation, it links to this boiler.
- To confirm: Junkers ZSR 8-3 — dan 8 748 300 158 (87483001580) as the Netzmodul of this family. Confirmation recorded: this PCB is in the ZWR 24-3, so it is not ruled out; without additional confirmation, it is linked to this boiler.
- Do not confuse: 8 748 300 158 — Netzmodul that the official spare parts list provides for ZR/ZSR/ZWR 18/24-3 (AE/ADE and K.E) and for that family — Different code: no documentation links it to 8 748 301 077 or states that it replaces it. Compare the code marked on your PCB.
- Do not confuse: 87483001580 — 11-digit manufacturer number of 8 748 300 158 — It is 8 748 300 158 with an added 0; it is not the code marked on this PCB (8 748 301 077).
- Do not confuse: 8 748 300 281 — Grundmodul (base module) from the same official list — It is another PCB (control board) of the control box, not the Netzmodul.
- Do not confuse: 874830110 — Junkers electronic circuit from another online source (French website) — Different code: the technical sheet does not specify which boiler it is for nor that it is this PCB.
- In the documentation, Unconfirmed: 8 748 301 077. The official lists for the ZR/ZSR/ZWR 18/24-3 family provide another code for the Netzmodul: 8 748 300 158. Registered confirmation: 8 748 301 077 in the ZWR 24-3.
- Compatibility with the ZWR 24-3 registered. In the documentation Unconfirmed: 8 748 301 077; the official list and another Netzmodul (8 748 300 158) for the family.
- Pending registered applications to confirm by model, variant, or programming: Junkers ZWR 24-3.
Frequently asked questions: junkers
What is the Junkers Netzmodul 8 748 301 077 and how do I identify it?
It is a Junkers PCB called Netzmodul (network module). The code 8 748 301 077 is marked on the board, which also has the marking "1.1", a printed fuse T1.25A, and the terminals L1, N1, and PE. Do not confuse it with the Grundmodul (base module): the official list separates them as two boards of the control box and provides the code 8 748 300 281 for the Grundmodul.
Is it compatible with my Junkers ZWR 24-3?
The compatibility of this variant is pending confirmation. Registered application: this PCB for the ZWR 24-3. One thing to keep in mind: the official list for the ZR/ZSR/ZWR 18/24-3 family and for that family another Netzmodul, 8 748 300 158, and in the documentation Unconfirmed: 8 748 301 077. The series has variants (AE, ADE, K.E): compare the code of your PCB or send us a photo from Contact.
Is it the same PCB as the 8 748 300 158 from the official list?
We don't know. The official spare parts list for ZR/ZSR/ZWR 18/24-3 shows the Netzmodul 8 748 300 158 (AE/ADE, pos. 13; K.E, pos. 15) and online (German pages) lists 87483001580 for ZWR 18/24-3 and ZWR 24-3 KE/AE. The text read from the list does not mention 8 748 301 077 and it is unconfirmed whether it is equivalent. Confirmation recorded: 8 748 301 077 for ZWR 24-3: compare the code marked on your PCB.
Is it compatible with another Junkers, such as the ZWR 18-3, the ZR or the ZSR?
The compatibility of this variant is pending confirmation. We do not know: we only have the ZWR 24-3 registered. For those boilers, they provide another Netzmodul, the 8 748 300 158 (87483001580 when ordering): ZR, ZSR and ZWR 18/24-3, and ZSR 8-3. If your boiler is different, call us at 911 17 77 77 or send us a photo from Contact.
What do 8 748 301 077, 1.1, and 87483001580 mean?
8 748 301 077 is the code marked on the plate and "1.1" is the other marked; the read pages do not explain what it indicates. 87483001580 is not the code marked on this plate: it is 8 748 300 158 with an added 0, because the official list indicates that when ordering, a "0" is added as the 11th digit.
What fault can a failure of the Netzmodul indicate in a ZWR 24-3?
A forum thread describes a Cerastar ZWR 24-3 that shuts down with a fault, makes a faint ticking sound with the flame on, and requires frequent resets with the reset button. The author wanted to change the Netzmodul, although he suspected an ionization fault, and the thread does not confirm the cause. We have not read any official table that relates fault codes to this PCB.
Who should install this PCB?
A qualified technician. The official spare parts list for the ZR/ZSR/ZWR 18/24-3 family indicates that the spare parts can only be installed by an authorized installer.
Junkers PCB Netzmodul 8 748 301 077 for Junkers ZWR 24-3