Wolf CG EK 18 Auxiliary PCB Ref. 2003439

Wolf boilers compatible with reference 2003439

PCB with reference 2003439. A proven compatibility: CG EK 18.

Proven compatibility

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 ref. 2003439 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

1. Find the reference printed on the installed part and check whether it matches the catalogue reference 2003439. If it is not visible, do not identify the part from its shape alone.
2. Check the full boiler model on its data plate and look for it in the model associations on this page.
3. Compare the connections and physical body with the original part before installation.
4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.

Symptoms that require diagnosis on the PCB 2003439

The PCB controls the ignition, modulation, and safety features of the boiler. These are the typical symptoms and what to do:

Common symptoms and faults

• 01

  The boiler generally works, but there is a specific function that doesn't start when it should (for example, a pump or a valve), while the rest operates normally.

  Cause: The auxiliary PCB controls a specific circuit through its own relay. If the relay does not close the contact, the function will not activate even if the main PCB is functioning properly.

  Check if you can hear the click of the relay when that function should be activated; if you don't hear it, first rule out a wiring issue before considering that the PCB is faulty.

• 02

  A clicking or buzzing sound is repeatedly heard near the auxiliary PCB, whether the boiler is on or off.

  Cause: A faulty relay can intermittently open and close the contact, either due to wear or an internal poor connection.

  With the boiler turned off and unplugged, check that the relay is properly seated in its socket before considering that the PCB is damaged.

• 03

  The boiler displays a fault code related to a secondary function, not with the general ignition.

  Cause: As it is a secondary PCB, its faults usually affect a specific function and do not cause a general shutdown of the equipment.

  Note the exact code and check it in the Wolf manual to confirm that it refers to the circuit managed by this PCB before replacing it.

• 04

  After replacing the main PCB, the original fault still appears the same.

  Cause: If the fault is in the circuit that controls this auxiliary PCB, changing only the main one does not solve the problem, as it persists in the other relay.

  Before considering the new main PCB as good, check if the symptom depends on the specific circuit that manages this auxiliary.

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.

Data sheet for the PCB Wolf 2003439

Catalogue reference

2003439

Uniclima internal SKU

PLCAUXCG18

Brand

Wolf

Type of part

PCBs (control boards)

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.

Reference engraved on the mounted relay

5456CC 104AV03 0724 024703

Component Mat.Nr of the installed GFA

2789108