ITW BW12026-00 Transformer For Chaffoteaux Calydra 28 FF

Chaffoteaux boilers compatible with reference 61002105-20

Ignition transformer with reference 61002105-20. 31 verified compatibilities: Calydra 23 CF/FF (N/P) and Calydra 28 CF/FF (N/P).

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. 61002105-20 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 61002105-20. 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 in the ignition transformer 61002105-20

The ignition transformer generates the high voltage for the spark of the electrodes. These are the typical symptoms and what to do:

Common symptoms and faults

• 01

  The boiler is completely dead: no pilot lights or the control panel turn on, as if it has no power.

  Cause: The transformer does not deliver the necessary current to power the PCB, and without it, the boiler does not start.

  Measure with a multimeter if there is current at the terminals of the primary of the transformer before considering it faulty.

• 02

  The boiler turns off by itself intermittently, especially after it has been running for a while and has heated up.

  Cause: A transformer with damaged winding loses current when it heats up, and the PCB loses stable power supply.

  Leave the boiler on for a while and measure the output current of the secondary when it starts to fail, to see if it decreases.

• 03

  A fuse blows every so often, or the boiler stops and restarts by itself after a few minutes.

  Cause: An internal short circuit in the transformer, or an overload downstream, activates the thermal protection of the transformer.

  Before changing the transformer, check for any component that may be short-circuited (fan, gas valve) that is increasing the consumption.

• 04

  The remote control or the display indicates that there is no communication with the boiler, even though the main switch is turned on.

  Cause: Without the transformer power, the PCB does not start and cannot communicate with the control.

  First, check that the main switch and the network fuse of the boiler are in good condition before considering the transformer as faulty.

Chaffoteaux fault codes that require diagnosis

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.

Chaffoteaux Ignition Transformer Datasheet 61002105-20

Catalogue reference

61002105-20

Uniclima internal SKU

TCDRA28FF

Brand

Chaffoteaux

Type of part

Transformers

Units in stock

7 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 (label)

ITW

Component code

BW12026-00

Supply voltage

220-240 Vac 50-60 Hz

Power

3 VA

Maximum temperature

+90°C

Date code

DATE3501B

Batch

LOT61743