Junkers PCB 8748300570 · HTII-3 for ZWC24-1MF2A
Application for the exact variant pending confirmation. Control PCB that receives signals and manages the electrical components of the boiler. In Junkers ZWC21/24/28-1MF2A, the control board occupies position 4: reference 8 748 300 506 in the general version and 8 748 300 533 in the variant 2800. The correspondence with the ending 570 of this unit is pending confirmation. The lack of ignition or shutdowns requires diagnosis.
- Type of part
- Junkers
- Status
- Refurbished
- Catalogue reference
- 8748300570
- Warranty
- 1 year
Boilers Junkers compatible with reference 8748300570
Junkers with reference 8748300570. 0 verified compatibilities. There are another 1 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 ZWC24-1MF2A | 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 reference 8748300570 is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Look for the printing on the plate that says "8 748 300" and the label with the suffix "570": together they give 8748300570.
- Compare the barcode 36412181, the one on the back 570130141561, and the relay marked HTII-3 / DC AC DC.
- Do not confuse it with other Junkers boards that start with 8 748 300: what changes is the suffix (570, 506, 533, 554…).
- Check the data plate of your boiler to confirm that the model is Junkers ZWC24-1MF2A.
- if they match, call us at 911 17 77 77 with your boiler model and we will confirm if we have it available.
Symptoms that require diagnosis in the junkers 8748300570
Common symptoms and faults
- 01
The boiler does not ignite or turns off unexpectedly for no apparent reason.
Cause: of spare parts is associated with its PCB 87483005060 of this boiler, another code. Compare the number and position of relays and connectors with your PCB, as indicated.
- 02
Persistent fault codes on the display indicating a communication or PCB failure.
Cause: Note the code and check it in the fault table of your model's manual.
- 03
Constant resets during heating or domestic hot water.
Cause: It is also mentioned for its PCB 87483005060. It is a guiding symptom, not from an official manual: a technician should confirm the diagnosis before replacing the PCB.
- 04
The boiler does not ignite and shows EA.
Cause: Gas shortage, air in the line, or defective ignition or ionization electrodes. There may also be moisture on the PCB.
Check the gas valve and press reset once. If it appears again, have a technician check it.
- 05
The boiler displays F0 on the screen.
Cause: Internal fault in the electronics, almost always in the PCB; sometimes it is defective ignition connections or wires.
Check the electrical connections and the ignition wires. If the fault code returns, have a technician check it to replace the PCB.
Junkers fault codes that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| E9 | Safety temperature limiter activated on the supply. | Check the pressure of the installation, ensure the pump is working and the fuse of the PCB, and bleed the unit. If it happens again, have a technician check it. |
| d3 | The bridge is missing in the safety connector of the PCB (terminals 8-9 open). | Check that the jumper or connector of the thermostat is properly placed according to the diagram. If it is correct and the fault code persists, it points to the PCB; have a technician check it. |
| E2 | NTC sensor of the supply line faulty or disconnected. | Check the flow sensor and its connection cable. If the sensor is fine, point to the PCB; have a technician check it. |
| EA | No ignition flame detected. | Check that there is gas and press reset once. If it repeats, it points to the ignition or ionization electrodes, or the PCB; have a technician check it. |
| F0 | Internal electronic error (internal fault of the PCB or its connections). | Check the electrical connections and the securing of the ignition wires. If the issue persists, the PCB is usually the part that needs to be replaced; have a technician check it. |
| E0 | Internal fault in the PCB (control board). | Check for any moisture or sulfated contacts on the PCB. If the issue persists, the PCB needs to be replaced; have a technician check it. |
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 8748300570
- Catalogue reference
- 8748300570
- Uniclima internal SKU
- PLC249
- Brand
- Junkers
- Type of part
- Junkers
- Units in stock
- 5 units
- 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.
- Visible marking/barcode
- 36412181
- Visible marking of the PCB
- 8 748 300 + label 570
- Visible marking/review
- 2.7
- Visible marking
- 0542
- Black subcomponent marking
- HAHN Z 10003; 8 737 702 723; KW G 27/13 DLHP / F114 / D301
- Subcomponent potentiometer
- PIHER / SPAIN
- Terminal numbering
- 1 / 2 / 4 / 7 / 8 / 9
- Relay marking
- HTII-3 / CC CA CC
- Marked code
- 0542 / 2.7
- Barcode on the reverse
- 570130141561
- Technical sheet: Visible marking/barcode
- 36412181
- Technical sheet: Visible plate marking
- 8 748 300 + label 570
- Technical sheet: Visible inspection/marking
- 2.7
- Visible marking
- 0542
- Technical sheet: Marking of the black subcomponent
- HAHN Z 10003; 8 737 702 723; KW G 27/13 DLHP / F114 / D301
- Technical sheet: Potentiometer subcomponent
- PIHER / SPAIN
- Technical sheet: Terminal numbering
- 1 / 2 / 4 / 7 / 8 / 9
- Technical sheet: Relay marking
- HTII-3 / CC CA CC
- Technical sheet: Marked code
- 0542 / 2.7
- Barcode on the back
- 570130141561
- Registered reference
- 8748300570
- Additional markings
- Visible code/bar 36412181; PCB 8 748 300 + label 570; revision 2.7; brand 0542. Black subcomponent HAHN Z 10003; 8 737 702 723; KW G 27/13. Potentiometer PIHER/Spain; another subcomponent DLHP/F114/D301. Terminals 1/2/4/7/8/9. Relay HTII-3 / DC AC DC. Reverse barcode 570130141561; repetition 0542/2.7.
- Pending applications to verify
- ZWC24-1MF2A — compatibility noted; pending confirmation by variant.
- To confirm: These symptoms come from the technical sheet for the PCB 87483005060 of the same boiler, not from an official manual: they are indicative.
- Not compatible or excluded at source: Junkers ZWE 24-2 KDG — Its official spare parts list provides a different PCB: 8 748 300 213
- Do not confuse: 8 748 300 506 0 — Printed circuit board (pos. 4 of the control panel, general version) that provides the official Junkers list for the Euromaxx family ZWC21/24/28-1MF2A. for the ZWC24-1MF2A as 87483005060 and additionally 8744501294. Third parties note it as "ex 454-0" (parts list) and "ex J8748300488" (catalog from a distributor) — It is another code and they do not mention the 570. Registered confirmation: the 570 for your boiler: compare the code on your board.
- Do not confuse: 8 748 300 533 — Printed circuit board (pos. 4) that the same list provides for the variant 2800 — Another suffix: the list does not mention 570.
- Do not confuse: 87483005540 — PCB "HTII-3 GZT3" from Junkers for ZSN/ZWN/ZWR/ZSR..-6... — It shares HTII-3 in the name, but it is a different code and another series of boilers: it is not compatible with the ZWC24-1MF2A.
- Do not confuse: 8 748 300 554 — Grundmodul PCB from Junkers, — Same prefix 8 748 300 and a different suffix: do not link it to the ZWC24-1MF2A.
- for this boiler 8 748 300 506 (87483005060), which is another code; the official list of the ZWC21/24/28-1MF2A family shows 8 748 300 506 in position 4 of the general version, and 8 748 300 533 in the 2800 variant. Compare the suffix of your PCB.
- registered for the ZWC24-1MF2A. Unconfirmed: the 8748300570: for that boiler the 8 748 300 506. In contrast, the official list of the ZWC21/24/28-1MF2A family gives in position 4 the 506 (general) and the 533 (variant 2800).
- Pending registered applications to confirm by model, variant, or programming: Junkers ZWC24-1MF2A.
Frequently asked questions: junkers 8748300570
How do I identify the Junkers 8748300570 PCB?
Is it compatible with my Junkers ZWC24-1MF2A?
What is the difference between 8748300570 and 8 748 300 506?
Why do some listings write a 0 at the end of the code?
What do 8 748 300, 570, HTII-3, and 8 737 702 723 mean?
Is it compatible with other Junkers, such as the ZWC28-1MF2A or the ZWC24-1MF2K?
Who should install it and what should I check beforehand?
