Junkers HT II-3 PCB · 8 748 300 535 for ZWC 24/28-1 MFK

Application for the exact variant pending confirmation. PCB with registered application for Junkers ZWC 24/28-1 MFK. There is a discrepancy with the reference 8 748 300 449 associated with the control panel of this boiler; check the exact code before replacing it.

Type of part: Junkers
Status: Refurbished
internal SKU: PLC250
Warranty: 1 year

VAT included Stock · 6 units

Compatibility

Compatible Junkers boilers

Junkers. 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 ZWC 24/28-1 MFK	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.

Guide

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 designation HT II-3 CA CA CC and the code 8 748 300 535 (it can also be written as 8748300535).
Compare the rear or side marking 8 718 401 474 0 and the marked codes 0448 and 2.6 with those on your PCB.
Look at the display, which in this PCB is 2 digits, and the blue capacitor on top, marked 400 V.
Do not rely solely on the designation HT II-3 CA CA CC: another board with that marking has the code 8 748 300 480. Compare the complete code.
they match, call us at 911 17 77 77 with your boiler model and we will reserve it for you. Any questions? Send us a photo of your spare part label and the boiler's specification plate from the Contact section.

Diagnosis and fault codes

Symptoms that require diagnosis in the junkers

Common symptoms and faults

01
Fault code F0 in the ZWC 24-1 MFK or ZWC 28-1 MFK
Cause: The official manual 6 720 610 422 E describes it as an internal fault or PCB fault: it requests to check contacts, connectors, and ignition cables and the bus module, and if necessary, replace the PCB or the bus module.
02
The boiler shows the fault code F0.
Cause: Internal fault or of the PCB (control board). First of all, contacts, connectors, and cables need to be checked; if necessary, the PCB or the bus module is replaced.
Before replacing the PCB, a technician must check the secure connection of the electrical contacts and plug, as well as the ignition cables and the bus module. If the fault persists, the printed circuit board or the bus module is replaced. F0 alone does not prove that the board is faulty.

Junkers fault codes that require diagnosis

Code	Fault	Technical checks
F0	Internal fault / fault of the PCB (ZWC 24-1 MFK and ZWC 28-1 MFK)	Check the secure attachment of the electrical contacts and plug, as well as the ignition cables and bus module. If necessary, replace the PCB (control board) or the bus module. This should be done by a qualified technician.

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 data

Technical sheet: Junkers

Uniclima internal SKU: PLC250
Brand: Junkers
Type of part: Junkers
Units in stock: 6 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.

Inventory — Upper blue condenser: 400 V
Inventory — Display: 2 digits
Inventory — Rear/side marking: 8 718 401 474 0
Inventory — Application indicated in inventory: JUNKERS ZWC 24/28 1 MFK
Identification — Marked designation: HT II-3 CA CA CC
Identification — Marked code: HT II-3 CA CA CC
Identification — Marked code: 0448
Identification — Marked code: 2.6
Inventory data — Upper blue condenser: 400 V
Inventory data — Display: 2 digits
Inventory data — Rear/side marking: 8 718 401 474 0
Inventory data — Application indicated in inventory: JUNKERS ZWC 24/28 1 MFK
Registered reference: 8748300535
Additional markings: Blue upper capacitor marked 400 V; 2-digit display. Plate marking 8 748 300 535; rear/side marking 8 718 401 474 0; PCB 0448; code 2.6.
Pending applications to verify: JUNKERS ZWC 24/28 1 MFK — compatibility noted; pending confirmation by variant.

Before purchasing

F0 does not prove by itself that the PCB is faulty: the official manual instructs to first check the contacts, connectors, and cables.
Do not confuse: 8 748 300 449 — PCB (control board, pos. 4) of the ZWC 24/28-1 MFK in the official parts list from 2001 — It is another code. This sheet is 8 748 300 535 (HT II-3 CA CA CC), registered.
Do not confuse: 8 748 300 480 / 8 748 300 565 — HT II-3 CA CA CC (480) and HT II-3 CC CA CC (565) in a list of — Same marking or very similar, but different codes: compare the complete code 8 748 300.
Do not confuse: 8 748 300 454 / 8 748 300 506 — PCB (position 4) in two revisions (02.10 and 05.08) of the official list 6720611196 from the ZC/ZSC/ZWC 24/28-1 family — Other codes from another list of the family; none include 8 748 300 535.
Do not confuse: 8 717 207 456 — "Control unit" (pos. 1) from the official parts list of 2001 — It is another part of the control group, not this PCB.
Do not confuse: 8 714 411 183 / 8 714 411 184 — Coding plugs (Kodierstecker, pos. 5) from the same breakdown — They are other parts from the control group, not this PCB.
without additional external confirmation, it collects 8 748 300 535. The official breakdown from 2001 provides another PCB for the ZWC 24/28-1 MFK, which is 8 748 300 449: always compare the code marked on your PCB.
Compatibility with the ZWC 24/28-1 MFK registered. Without any additional external confirmation so far, it collects 8 748 300 535; the official breakdown from 2001 provides another PCB (8 748 300 449) for that boiler.
Pending registered applications to confirm by model, variant, or programming: Junkers ZWC 24/28-1 MFK.

Frequently Asked Questions

Frequently asked questions: junkers

How do I identify the Junkers HT II-3 control board with the code 8 748 300 535?

The code of the PCB is 8 748 300 535 (also 8748300535) and the marked designation is HT II-3 CA CA CC. Additionally, compare the marking on the back or side 8 718 401 474 0 and the marked codes 0448 and 2.6. Our unit has a 2-digit display.

Is it compatible with my Junkers ZWC 24/28-1 MFK?

The compatibility of this variant is pending confirmation. Registered application: this PCB for the Junkers ZWC 24/28-1 MFK. Without additional external confirmation, it still collects the code 8 748 300 535 alongside that boiler, so we cannot provide you with a catalog reference: compare the code marked on your PCB.

Why does the official breakdown of the ZWC 24/28-1 MFK provide a different PCB code?

The official spare parts list from 2001 indicates that the Leiterplatte (PCB) for the ZWC 24-1 MFK and the ZWC 28-1 MFK is 8 748 300 449, not 8 748 300 535. Other revisions of the official list for the family also provide different codes (8 748 300 454 and 8 748 300 506). Registered confirmation: 8 748 300 535 for that boiler and without additional open confirmation explains the difference. Always compare the code marked on your PCB.

Is it enough for my PCB to say HT II-3 CA CA CC?

No. A list of the same marking shows another PCB, the 8 748 300 480, and with HT II-3 CC CA CC the 8 748 300 565. Compare the complete code 8 748 300 535. If your boiler is a different model, send us a photo of your PCB label and the specifications plate of your boiler from Contact, or call us at 911 17 77 77.

What does each code on the PCB mean?

8 748 300 535 is the main code. HT II-3 CA CA CC is the marked designation. 8 718 401 474 0 appears on the rear or side marking, 0448 and 2.6 are marked codes, and PLC250 is our warehouse reference. Without additional confirmation, do not explain the letters CA CA CC or the codes 0448 and 2.6.

What does fault code F0 mean in the ZWC 24/28-1 MFK?

According to the fault code table in the official manual for the ZWC 24-1 MFK and ZWC 28-1 MFK (6 720 610 422 E), F0 is "internal fault / PCB fault." The manual instructs to first check the securing of the electrical contacts and the plug, as well as the ignition cables and the bus module. Only if necessary, replace the PCB or the bus module.

What should be checked when installing it and who should do it?

It must be installed by a qualified technician: it is the control board of a gas boiler and before touching anything, the power supply must be cut off and the gas closed. The official breakdown from 2001 of the ZWC 24/28-1 MFK lists a coding plug (Kodierstecker) in two variants, 8 714 411 183 and 8 714 411 184: it is advisable for the technician to check which one your boiler has.

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Junkers HT II-3 PCB · 8 748 300 535 for ZWC 24/28-1 MFK