Honeywell CS0116C-LS PCB - Baxi Eco 240 FI / Luna - CD 56.5389.2

Control PCB manufactured by Honeywell, code CS0116C-LS (CD Baxi 56.5389.2). It is installed in Baxi boilers from the Eco and Luna ranges and manages the ignition and overall operation of the unit. The replacement requires first confirming the fault of the part through technical diagnosis, even when the boiler does not ignite, locks out without apparent cause, or presents electronic faults that do not depend on other components.

Type of part: PCBs (control boards)
Status: Refurbished
Catalogue reference: JJJ005653890
Warranty: 1 year

VAT included OUT OF STOCK

Compatibility

Baxi boilers compatible with reference JJJ005653890

PCB with reference JJJ005653890. Three confirmed compatibilities: Eco 240 Fi and Eco 240 i.

Proven compatibility

Boiler model	Family	Verification
Baxi Eco 240 Fi	Baxi Eco	Contrasted
Baxi Eco 240 i	Baxi Eco	Contrasted
Baxi Eco 1.240 Fi	Baxi Eco	Contrasted

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 ref. JJJ005653890 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 JJJ005653890. 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.

Diagnosis and fault codes

Symptoms that require diagnosis on the PCB JJJ005653890

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 ignite and there is no sound of any attempt to start.
Cause: The PCB does not send signals to the fan and the gas valve to initiate the start-up.
Check if power is reaching the boiler and verify that the fan and the pump are functioning correctly before blaming the PCB.
02
The boiler locks itself without any visible fault in other components.
Cause: The PCB can enter a safety lockout due to an internal fault, even if there are no issues with other components.
Reset the boiler and observe if the lockout occurs at the same moment during ignition; this helps to identify if the problem is with the PCB or another component.
03
The operation fails intermittently: some days it starts well and others it doesn't ignite.
Cause: A fault in the PCB related to temperature or humidity can cause intermittent issues.
Check if the fault occurs more on cold or humid days before deciding to change the PCB.

Baxi fault codes that require diagnosis

Code	Fault	Technical checks
E01	Lockout - does not ignite	The ignition/modulation PCB may not generate a spark or correctly manage the ionisation signal, or it may not energise the gas valve. Check the spark/electrode, polarity, and voltage/order to the valve; if all peripherals are correct, the PCB JJJ005653890 is faulty.
E35	Parasite flame (flame error)	The flame detection circuit on the PCB interprets the presence of a flame with the burner off (moisture, poor grounding, or ionization amplifier fault). Check grounding/polarity, wiring, and electrode/ionization; if E35 persists with the electrode disconnected, the PCB JJJ005653890 is defective.

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

Data sheet for the Baxi JJJ005653890 PCB.

Catalogue reference: JJJ005653890
Uniclima internal SKU: PEBE240FI
Brand: Baxi
Type of part: PCBs (control boards)
Units in stock: 0 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.

Manufacturer: Honeywell
PCB code (Honeywell): CS0116C-LS
CD Baxi: 56.5389.2
CE marking (type approval): 0051AU1699
Type: ECOINT00
Manufacturing date: 05/03 (and 12/03 in another unit of the same reference)
Main relay: SCHRACK V23148-B0005-A101, 12V
Transformer: Electron-Coil (Erba, CO, Italy), A040A5018BA

Before purchasing

The manufacturer of the PCB is Honeywell; Baxi is the brand of the boiler, not the component.

Frequently Asked Questions

Frequently asked questions about the PCB JJJ005653890

Who manufactures the CS0116C-LS PCB used in the Baxi Eco 240 FI?

The Honeywell factory; in the Baxi boiler it appears with the code CD 56.5389.2.

Does this Honeywell CS0116C-LS PCB work for a Baxi Luna 240 FI?

Yes, the Luna 240 I/FI is among the compatible models listed for this PCB.

What fault of the Baxi Eco 240 FI does this PCB solve?

It should be checked when the boiler does not ignite, gets blocked without apparent cause, or presents electronic faults that do not depend on other components. Replacement requires a technical diagnosis.

What is the function of the CS0116C-LS PCB in the Baxi Luna?

Manages the ignition and overall operation of the equipment.

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1-year warranty reviewed and tested

14-day return uninstalled parts

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Honeywell CS0116C-LS PCB - Baxi Eco 240 FI / Luna - CD 56.5389.2