Ignition Transformer Cointra Supra Compact SPC 21 EI VZ 2/10 HDC Ref. 9158791

Ignition transformer for Cointra Supra Compact SPC 21 EI boilers and the Supra SP/SPA range. It generates the high voltage spark that ignites the burner. Model VZ 2/10 HDC, power supply 220-240 V at 1.5 VA and 50-60 Hz. The replacement requires first confirming the fault of the part through technical diagnosis, even when the boiler does not ignite or the ignition fails despite gas reaching it and having an electrode in good condition.

Type of part: Transformers
Status: Refurbished
Catalogue reference: 9158791
Warranty: 1 year

VAT included Stock · 3 units

Compatibility

Cointra boilers compatible with reference 9158791

Ignition transformer with reference 9158791. Six confirmed compatibilities: Supra Compact SPC 21 EI and Supra SP 21 EI.

Proven compatibility

Boiler model	Family	Verification
Cointra Supra Compact SPC 21 EI	Cointra	Contrasted
Cointra Supra SP 21 EI	Cointra	Contrasted
Cointra Supra SP 21 I	Cointra	Contrasted
Cointra Supra SP 24 I	Cointra	Contrasted
Cointra Supra SP 27 EI	Cointra	Contrasted
Cointra Supra SPA 27 EI	Cointra	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. 9158791 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 9158791. 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 in the ignition transformer 9158791

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 does not ignite even though it is evident that gas is reaching the burner.
Cause: The transformer does not provide the high voltage needed for the electrode to ignite the gas that is already present.
Check the position of the electrode relative to the burner before changing the transformer: if it is misaligned, the spark will not reach where it should even if the transformer is working.
02
The ignition takes longer than usual or sometimes fails, while other times it works.
Cause: A transformer that starts to degrade provides sufficient voltage in some cycles and not in others, causing irregular ignitions.
Note whether the fault occurs during cold start or if it repeats the same in hot conditions; this helps to distinguish an intermittent transformer from another cause.
03
The spark attempt can be heard, but the burner does not ignite.
Cause: The spark can sound even if it has low energy; if the transformer does not provide enough voltage, it does not ignite the gas and air mixture.
Check that the distance between the electrode and the ground is correct and that there is no carbon buildup before blaming the transformer.

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

Ignition transformer datasheet Cointra 9158791

Catalogue reference: 9158791
Uniclima internal SKU: TEVGSPC21EI
Brand: Cointra
Type of part: Transformers
Units in stock: 3 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.

Model / part code: VZ 2/10 HDC
Supply voltage: 220-240 V
Power: 1.5 VA
Frequency: 50-60 Hz
Operating temperature: -20°C / +60°C
Sales reference: 9158791, identified as this transformer for Cointra Supra Compact SPC 21 EI

Frequently Asked Questions

Frequently asked questions about the ignition transformer 9158791

Does this part VZ 2/10 HDC fit the Cointra Supra SPA 27 EI?

Yes, the Supra SPA 27 EI is on the list of compatible boilers, along with the Supra Compact SPC 21 EI and the Supra SP 21 EI and SP 27 EI.

What voltage does the transformer of the Cointra Supra Compact SPC 21 EI operate at?

220-240 V, 1.5 VA and 50-60 Hz, according to its label.

What fault indicates that this ignition transformer needs to be replaced?

It should be checked when the boiler does not ignite or fails to start despite gas reaching it and the electrode being in good condition. Replacement requires a technical diagnosis.

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Ignition Transformer Cointra Supra Compact SPC 21 EI VZ 2/10 HDC Ref. 9158791