Vaillant PCB 734629 · For the VMW ES 240/3 boiler

Application to the exact variant pending confirmation. It is the PCB of the boiler: in this unit it has terminals L, N, 3, 4, 5, 7, 8, and 9 and a 10 A relay.

Type of part: Vaillant
Status: Refurbished
internal SKU: PLC171
Warranty: 1 year

VAT included Stock · 1 unit

Compatibility

Compatible Vaillant boilers

Vaillant. 0 verified compatibilities. There are 3 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.

Vaillant Thermo Compact 637E and Turbomax Plus 837E	Vaillant	Unconfirmed
Vaillant VUW (series)	Vaillant	Unconfirmed
Vaillant VMW ES 240/3	Vaillant	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.

Check the soldering side of your PCB: it should have 734629, 1600-30, BM-AF, and BC-AF printed on it. Also, verify that it has terminals L, N, 3, 4, 5, 7, 8, and 9, and a 10 A relay.
Also compare the marked codes: 001596 2, 734498, 7346 34.5 and 00 00711921 008.
Confirm the type of your boiler on its rating plate, located at the bottom of the unit (according to the Vaillant user manual).
Do not consider 734629 and 0020034604 as equal: they do not match on the read pages. Always compare the printed codes.
if they match, call us at 911 17 77 77 with your boiler model. Any questions? Send us a photo of the PCB and the data plate of the boiler from Contact.

Diagnosis and fault codes

Symptoms that require diagnosis in the Vaillant.

Common symptoms and faults

01
The boiler does not ignite: after three attempts without a flame, the fault code F.28 appears and it goes into fault mode.
Cause: Gas shortage or ignition failure, faulty electrodes or damaged PCB.
If it repeats, have a technician check it. Do not attempt to reset multiple times in a row.
02
The boiler shuts down during operation and the restart fails (fault code F.29).
Cause: Temporary gas cut, gas recirculation, condensates, or faulty grounding.
Have a technician check it.
03
The gas valve does not activate: the boiler stops with fault code F.61.
Cause: Fault in the wiring or in the coils of the gas valve, or faulty PCB.
Have a technician check it.
04
The boiler does not ignite: ignition attempts unsuccessful.
Cause: Insufficient gas or air in the pipe, electrode or ignition cable, electronic igniter or faulty electronic system.
Press Reset once. If it doesn't start, have a technician check it.
05
The boiler turns off during use and does not ignite again.
Cause: Gas cut-off or ignition failure. The PCB may be involved.
Check that the gas valve is open and turn the boiler off and on once. If it repeats, have a technician check it.
06
The boiler stops working and displays an electronic fault code.
Cause: Electronic fault of the PCB or the connection of the gas valve.
Note the screen code and have it checked by a technician.
07
The boiler shows a flame warning with the burner off.
Cause: Flame signal with the burner off: PCB, electrode or gas valve.
Turn it off and on once and check the gas supply. If it happens again, have a technician check it.
08
The boiler locks out after several ignition attempts.
Cause: Gas shortage, faulty ignition electrode, or faulty electronic ignition.
Check if there is gas. If it happens again, have a technician check it.

Vaillant fault codes that require diagnosis

Code	Fault	Technical checks
F.28	Start-up fault: after three attempts without flame, the boiler goes into fault.	If it repeats, have a technician check it: it could be the gas, the electrodes, or the PCB.
F.29	Flame loss during operation and failed reignition.	If it repeats, have a technician check it: it could be the gas supply, the flue gas recirculation, the grounding, or the ignition.
F.61	The gas valve does not activate properly: fault in the wiring, coils, or PCB.	Have a technician check it. Point to the PCB if the wiring of the gas valve is correct.
F.62	The gas valve takes time to close after the flame goes out.	Have a technician check it: it could be the gas valve, the electrode, or the PCB.
F.63	Fault in the memory of the PCB (EEPROM).	It usually points to the PCB: have a technician check it.
F.67	The flame signal is not valid: fault in the electronics or ionization.	If it goes out when turning on, have a technician check the PCB and the ionization.
F.20	The safety limiter has been activated due to temperature: the supply or return sensor has exceeded the maximum.	Check that there is water in the circuit and that the pump is circulating. If the flow sensor is poorly connected or faulty, have a technician check it.
F.27	There is a flame signal with the burner off.	A technician should check it: there may be a gas valve that is not closing or a faulty flame controller.
F.60	Gas valve fault: valve cable short-circuited, or defective valve or main PCB.	Have a technician check it. If the gas valve and its wiring are fine, it could be the PCB.
F64	Fault in the PCB or a sensor.	Check the connections of the sensors. If it repeats, point it to the PCB: have a technician check it.
F65	The electronics are too hot.	Ventilate the area where the boiler is located. If it happens again, have a technician check it.
F00	Interruption of the supply temperature sensor.	Check the connection of the sensor. If the cable is fine, point to the sensor or the PCB. A technician will check it.
F01	Interruption of the return temperature sensor.	Check the connection of the sensor. If the cable is fine, point to the sensor or the PCB. A technician will 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 data

Vaillant

Uniclima internal SKU: PLC171
Brand: Vaillant
Type of part: Vaillant
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.

Inventory — Plate markings: GND, 24 V and 5 V
Inventory — Visible terminals: L, N, 3, 4, 5, 7, 8 and 9
Inventory — Mounted relay: 10 A; 250 V~
Inventory — EPCOS mounted capacitor: B32922; class X2; 275 V~
Inventory — CI ELMOS assembled: H1101B, photographic reading 41101B, alternative photographic reading
Inventory — PCB solder side: 1600-30; 734629; BM-AF; BC-AF
Inventory — Application indicated in inventory: VMW ES 240/3
Inventory — Marked code: 00 00711921 008; 001596 2; 7346 34.5
Identification — Marked code: 001596 2
Identification — Marked code: 734498
Identification — Marked code: 7346 34.5
Inventory data — Plate markings: GND, 24 V and 5 V
Inventory data — Visible terminals: L, N, 3, 4, 5, 7, 8 and 9
Inventory data — Mounted relay: 10 A; 250 V~
Inventory data — EPCOS mounted capacitor: B32922; class X2; 275 V~
Inventory data — CI ELMOS assembled: H1101B, photographic reading
Inventory data — CI ELMOS assembled: 41101B, alternative photographic reading
Inventory data — PCB soldering side: 1600-30; 734629; BM-AF; BC-AF
Inventory data — Application indicated in inventory: VMW ES 240/3
Inventory data — Marked code: 00 00711921 008; 001596 2; 7346 34.5
Registered reference: 734629
Registered model: PCB 734629
Additional markings: PCB 1600-30; 734629 BM-AF/BC-AF; codes 00 00711921 008, 001596 2 and 7346 34.5; CI 734498; ELMOS marked H1101B or 41101B; capacitor EPCOS B32922, class X2.
Pending applications to verify: VMW ES 240/3 — compatibility mentioned; pending confirmation by variant. Commercial statement, consulted 10/24/2026: Vaillant VMW ES 242-5, for 734629. Pending documentary confirmation from the manufacturer; do not extend to other versions.

Before purchasing

To confirm: Vaillant Thermo Compact 637E and Turbomax Plus 837E — with the 734629: (637E and 837E) and (Turbomax Thermocompact, in the title)
To confirm: Vaillant VUW (series) — with the 734629 («VUW MAIN PCB», without model list). The 130805 or the 0020034604 appear for Thermocompact, Turbomax, and Aqua Plus; for Turbomax Plus.
Not compatible or excluded at source: VUW FR 240-3 — Its installation manual (FR02 09/2000) mentions another PCB: 130473 (line "Er.7 Platine 130473")
Do not confuse: 0020034604 — Vaillant PCB that is offered as a substitute for 130805 (Turbomax, Thermocompact, series VU/VUW) — In the documentation, none link it to 734629: compare the codes before ordering.
The read pages do not explain 734498, 001596 2, 7346 34.5, or 00 00711921 008. Compare them with those on your PCB.
734629 is a Vaillant PCB; without official breakdown. Not confirmed: the exact VMW ES 240/3; there are manuals for the VMW ES 240/3-3M and a technical sheet for the VMW ES 240-3, without PCB data. It confirms. lists 0020034604 for the VMW 240-3.
Pending confirmation of registered applications by model, variant, or programming: Vaillant VMW ES 240/3.

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Vaillant PCB 734629 · For the VMW ES 240/3 boiler