Junkers PCB E 3746/6 · 8 747 201 251 · 8613310175_V01 for ZWB 25-2 C

Application for the exact variant pending confirmation. PCB of Junkers boiler. Its specific faults are yet to be identified; a technician must diagnose the fault before replacing it.

Type of part: Junkers
Status: Refurbished
internal SKU: PLC228
Warranty: 1 year

VAT included Stock · 4 units

Compatibility

Compatible Junkers boilers

Junkers. 0 verified compatibilities. There are 2 other 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 series ZSB and ZBR (without specific model)	Junkers	Unconfirmed
Junkers ZWB 25-2 C	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 these codes on the PCB: 8613310175_V01 (circuit printing), 8 747 201 251, and E 3746/6.
Also check the side printing 8 513 075 10 and the marking 43-08-041.
Don't confuse it with other Junkers PCBs: the 8748300923 (ZWBC range) and the 8748300676 have a different code.
Check on the rating plate of your boiler that the model is Junkers ZWB 25-2 C.
if they match, call us at 911 17 77 77 with the model of your boiler.

Diagnosis and fault codes

Symptoms that require diagnosis in the junkers

Common symptoms and faults

01
The boiler does not ignite and the display shows EA.
Cause: Flame not detected: gas valve closed, insufficient gas pressure, faulty electrodes or ignition cable, or blocked flue.
Check that the gas valve is open and the gas pressure. Inspect the electrodes and their cable. If everything is fine, have a technician check it.
02
The display shows F0.
Cause: Internal fault: faulty electrical contacts or ignition cables, or defective PCB.
Check the electrical contacts and the ignition cables. If the fault code persists, have a technician replace the PCB.
03
The boiler stops due to excessive temperature and the display shows E9.
Cause: The temperature limiter of the heat block or exhaust gases has tripped.
Check the service pressure, the pump, and the fuses on the PCB, and bleed the unit. If the fault code returns, have a technician check it.
04
The boiler continues to detect flame after cutting off the gas, and FA appears on the display.
Cause: Gas valve that does not close tightly, dirty condensate siphon, or defective electrodes.
Check the gas valve, clean the condensate siphon, and inspect the electrodes. If the issue persists, have a technician check it.
05
The display shows CC: the boiler does not detect the external sensor.
Cause: Interruption in the external sensor or its cable.
Check that the outdoor sensor and its cable have no interruptions. If they are fine, have a technician check it.
06
A8 appears on the display: the boiler is not communicating with the controller.
Cause: Communication interrupted with the bus: connection cable of the regulator or thermostat loose, cut, or poorly connected.
Check the connection cable of the regulator or thermostat and its terminals. If the cable is fine, have a technician check it.

Junkers fault codes that require diagnosis

Code	Fault	Technical checks
EA	Flame not detected when igniting.	Check that the gas valve is open, the gas pressure, and the electrodes with their cable. If everything is fine and the fault code persists, the PCB is suspect: have a technician check it.
F0	Internal fault of the PCB.	Check the electrical contacts and the ignition wires. If the fault code persists, the PCB is suspect: have a technician replace it.
FA	The flame is still detected after the gas disconnection.	Check the gas valve, clean the condensate siphon, and inspect the electrodes. If the issue persists, have a technician check it.
E9	The temperature limiter of the heat block or exhaust gases has been triggered.	Check the service pressure, the operation of the pump and the fuses on the PCB, and bleed the unit. If the fault code returns, have a technician check it.
A8	Communication interrupted with the regulator or thermostat bus.	Check the connection cable of the regulator or thermostat and its terminals. If the cable is fine, have a technician check it.
CC	The PCB does not detect the outdoor temperature sensor.	Check the outdoor sensor and its cable for any interruptions. It only appears with the outdoor sensor installed.
d3	The external controller has been activated: bridge 8-9 or bridge PR-P0 is missing, or the limiter TB1 is open.	Check the terminal strip, the bridges 8-9 and PR-P0, and the limiter TB1 before suspecting 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 data

Technical sheet: Junkers

Uniclima internal SKU: PLC228
Brand: Junkers
Type of part: Junkers
Units in stock: 4 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.

Blue component, literal marking: 1u M 400 WD; no nominal data for the entire PCB.
Inventory — Mounted blue condenser: M105933992 TS04; 10 M 400 WQ M10599932 TS04; 1u M 400 V 040
Inventory — Lower blue subcomponent: EPCOS
Inventory — Screen printing/PCB code: 8613310175_V01; resistors marked 470M
Inventory — Side screen printing PCB: 8 513 075 10
Inventory — Application indicated in inventory: ZWB 25-2 C
Identification — Marked code: 8613310175_v01
Identification — Marked code: 43-08-041
Identification — Marked code: 8 747 201 251
Identification — Marked code: E 3746/6
Identification — Marked code: M105993992 T504
Componente azul, marcado literal: 1u M 400 WD; no nominal data for the entire PCB.
Inventory data — Mounted blue condenser: M105933992 TS04; 10 M 400 WQ
Inventory data — Mounted blue condenser: M10599932 TS04; 1u M 400 V 040
Inventory data — Lower blue subcomponent: EPCOS
Inventory data — Screen printing/PCB code: 8613310175_V01; resistors marked 470M
Inventory data — Side screen printing PCB: 8 513 075 10
Inventory data — Application indicated in inventory: ZWB 25-2 C
Pending applications to verify: ZWB 25-2 C — compatibility noted; pending confirmation by variant.

Before purchasing

From a Junkers PCB for the ZWB 25-2C (code 8748300676, different from those of this part), it states that it can be "configured according to boiler code." Ask your technician if the PCB needs configuration for your boiler.
To confirm: Junkers series ZSB and ZBR (without specific model) — 1 origin: circuit set 8613310175 V01 with transformer. Its title says "ZSB ZWB ZBR - 3" and does not mention models. The ZWB 25-2 C is already listed as registered.
Do not confuse: 8748300923 — Junkers PCB for the Cerapur Comfort ZWBC 24, 25, 28, and 30-2 C — It is another code: the one selling it does not associate it with any of the codes for this part.
Do not confuse: 8748300676 — PCB for the Junkers ZWB 25-2C — It is another PCB code; do not link it to 8 747 201 251. Always compare the marked codes.
87483007530 is only linked to this PCB (set with 8613310175 V01); provide that number for a Heatronic III (ZSB 14..22-3 A/E, ZWB 28-3 A/E) without naming this part. 8748300602 is provided. Compare them with your PCB before confirming the equivalence as correct.
Registered confirmation: the ZWB 25-2 C. 8 747 201 251 appears as a Junkers PCB in (German, Hungarian forum); the Italian one mentions it without indicating its origin. Neither connects 8613310175 V01 nor E 3746/6 with it. The official manual read does not mention these codes or the ZWB 25-2 C.
Pending registered applications to confirm by model, variant, or programming: Junkers ZWB 25-2 C.

Frequently Asked Questions

Frequently asked questions: junkers

How do I know if it is my Junkers E 3746/6 PCB?

Compare the codes: 8613310175_V01 on the circuit silkscreen (next to 43-08-041), 8 747 201 251 and E 3746/6 marked on the PCB, and 8 513 075 10 on the side silkscreen. If your PCB has those codes, it is this one.

Is it compatible with my Junkers ZWB 25-2 C?

The compatibility of this variant is pending confirmation. Registered: for the Junkers ZWB 25-2 C. The official Junkers manual we have been able to read (table ZB/ZWB/ZSB) does not mention our codes or the ZWB 25-2 C, and Unconfirmed: the ZWB 25-2 C with these codes: sells the circuit 8613310175 V01 in a set titled "ZSB ZWB ZBR - 3," without mentioning models.

Is it compatible with a Cerapur Comfort ZWBC 25-2 C or another ZWBC?

The compatibility of this variant is pending confirmation. We have not registered it. The spare parts for the ZWBC 24, 25, 28, and 30-2 C include another PCB, the 8748300923. Compare the codes or send us a photo of your PCB and the data plate from the Contact section; you can also call 911 17 77 77.

What is the difference between 8613310175_V01, 8 747 201 251, and E 3746/6?

8613310175_V01 is the code for the printed circuit board (silkscreen). 8 747 201 251 is the reference for the spare part (8747201251 without spaces) and E 3746/6 is its model; our inventory also notes E 3746/6 as the marking for the ignition subcomponent. The circuit 8613310175 V01 is sold in a set with a transformer (87483007530). German and a Hungarian forum thread use 8747201251 for a Junkers board; the Italian one also mentions it. Unconfirmed: the codes among themselves.

What is the 8748300602 that appears next to the 8747201251?

The Italian company offers the Junkers 8748300602 card as a replacement for the 8747201251, the same code for this PCB without spaces. It is a single one, does not mention boilers, and does not indicate the source of its text: it is to be confirmed, so compare the codes before ordering.

Is it known in which other Junkers boilers the 8 747 201 251 fits?

The compatibility of this variant is pending confirmation. There is no reliable list of other boilers: apart from the ZWB 25-2 C, without additional reliable confirmation, it is linked to a boiler model. In a Hungarian forum thread, one comment suggests it is for a Junkers TA 211 E, unconfirmed, and another states that it is not suitable for the ZWE-24. If your boiler is not the ZWB 25-2 C, please send us a photo of your PCB and the data plate from the Contact section, or call 911 17 77 77.

Who should install this PCB?

To confirm: A qualified technician. The German seller of 8747201251 also reserves these spare parts for qualified installers.

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Junkers PCB E 3746/6 · 8 747 201 251 · 8613310175_V01 for ZWB 25-2 C