Bertelli & Partners PCB DBM25 - Cointra Excellent Low NOx 24E Ref. 39834970
The Bertelli & Partners DBM25 PCB - Cointra Excellent Low NOx 24E Ref. 39834970 is a control device that manages the ignition, burner modulation, pump, and safety features of the boiler. When it fails, the boiler may not start, become locked, or operate erratically, potentially displaying the fault code A02, which indicates that there is a flame signal present with the burner off. This PCB is compatible with several boilers in the Excellent range, such as the Excellent Low NOx 24E and 32E, among others. A technician must confirm through diagnosis whether it needs to be replaced in case the mentioned symptoms occur or if faults in its operation are detected.
- Type of part
- PCBs (control boards)
- Status
- Refurbished
- Catalogue reference
- 39834970
- Warranty
- 1 year
Cointra boilers compatible with reference 39834970
PCB with reference 39834970. Four confirmed compatibilities: Excellent Micro Low NOx 24E and Excellent Micro Low NOx 32E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Cointra Excellent Micro Low NOx 24E | Excellent Micro Low NOx | Contrasted |
| Cointra Excellent Micro Low NOx 32E | Excellent Micro Low NOx | Contrasted |
| Cointra Excellent Low NOx 24E | Excellent Low NOx | Contrasted |
| Cointra Excellent Low NOx 32E | Excellent Low NOx | Contrasted |
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. 39834970 is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 39834970. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms that require diagnosis on the PCB 39834970
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 does not start and no LED is lit on the control panel.
Cause: There is no power reaching the PCB or the internal fuse is blown, and without power, nothing works.
Use a multimeter to check if 230V are reaching the PCB input and inspect the fuse before replacing it.
- 02
A fault code appears on the screen that cannot be reset, or that returns after a few minutes.
Cause: The PCB detects a real or reading fault and locks the boiler for safety.
Note the exact code and check if it corresponds to a sensor or ignition fault before blaming the PCB.
- 03
The pump or the fan do not start, although a click can be heard on the PCB.
Cause: The output relay that controls that component has worn out and does not close the contact.
Check if the pump or the fan spin freely when turned by hand; if they spin well, the fault points to the relay on the PCB.
- 04
The domestic hot water does not modulate well: it goes from cold to very hot without a middle ground.
Cause: The PCB does not correctly manage the modulation signal of the gas valve.
Check that the water flow is not reduced by limescale in the heat exchanger before attributing it to the PCB.
Fault codes Cointra that require diagnosis
| Code | Fault | Technical checks |
|---|---|---|
| A02 | Flame signal present with the burner off (the boiler detects a flame when there shouldn't be one). | One of the two documented causes is the PCB anomaly: the electronics misinterpret or incorrectly generate the ionisation signal. First, check the wiring of the ionisation electrode (rule out the electrode), and if it is correct, check/replace the PCB. Technical sources literally indicate 'PCB anomaly, check 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.
Data sheet for the PCB Cointra 39834970
- Catalogue reference
- 39834970
- Uniclima internal SKU
- PECLNOX
- Brand
- Cointra
- Type of part
- PCBs (control boards)
- Units in stock
- 2 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.
- PCB code
- DBM25
- Component manufacturer
- Bertelli & Partners (B&P)
Frequently asked questions about the PCB 39834970
Who manufactures the Bertelli and Partners DBM25 PCB for the Cointra Excellent Low NOx 24E?
Is the DBM25 PCB compatible with the Cointra Excellent Micro Low NOx 24E?
Can the code and manufacturer be seen in all the photos of the DBM25 PCB?
Does the Bertelli and Partners DBM25 PCB work for the Cointra Excellent Low NOx 32E?
How many models are compatible with the Bertelli and Partners DBM25 PCB?
What fault code is documented for this PCB?
