Flow switch Cointra Excellent D Micro LN 24 E - Ref. C30015300 (code On Part 33900029)

The flow switch detects the flow of water when a tap is opened and commands the ignition to produce domestic hot water. If it fails, hot water will not flow even if the tap is open, which can be indicated by the fault code F43: No circulation in the system. This component is compatible with Cointra models such as Excellent D Micro LN 24 E, Excellent Micro LN 24 E, Essential 24 E, Fer Easy C24, and Domiproject F24, among others. A technician must confirm through diagnosis whether it needs to be replaced when the symptom of lack of hot water occurs or the corresponding fault code is activated.

Type of part: Flow detectors
Status: Refurbished
Catalogue reference: C30015300
Warranty: 1 year

VAT included Stock · 3 units

Compatibility

Cointra boilers compatible with reference C30015300

Flow meter with reference C30015300. Five confirmed compatibilities: Excellent D Micro LN 24 E and Excellent Micro LN 24 E.

Proven compatibility

Boiler model	Family	Verification
Cointra Excellent D Micro LN 24 E	Cointra Excellent Micro LN	Contrasted
Cointra Excellent Micro LN 24 E	Cointra Excellent Micro LN	Contrasted
Cointra Essential 24 E	Cointra Essential	Contrasted
Cointra Fer Easy C24	Cointra Fer Easy	Contrasted
Cointra Domiproject F24	Cointra Domiproject	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. C30015300 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 C30015300. 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 flow meter C30015300

The flow meter detects the passage of water to activate the domestic hot water. These are the typical symptoms and what to do:

Common symptoms and faults

01
When opening the hot water tap, the boiler does not start the burner to heat it.
Cause: The flow switch does not detect the flow of water and does not send the signal to activate the DHW mode.
Check that the water flow when opening the tap is sufficient; with a very low flow rate, the flow switch may not activate.
02
It feels like you have to open the tap almost all the way for hot water to come out.
Cause: A pressure switch with a partially obstructed passage requires more flow than usual to activate the contact.
Check if the filter before the pressure switch has scale or dirt buildup before replacing the part.
03
The hot water comes in and out, cutting off and returning several times while the tap remains open.
Cause: The flow switch intermittently loses and regains the flow signal, causing the boiler to turn the burner on and off following those interruptions.
Check the pressure of the system on the manometer, because low pressure causes the same effect of interruptions.
04
The heating works normally, but the domestic hot water never starts.
Cause: If the flow switch does not close the contact, the boiler never receives the command to activate the DHW mode.
Make sure that the domestic hot water shut-off valve is fully open before replacing the part.

Fault codes Cointra that require diagnosis

Code	Fault	Technical checks
F43	There is no circulation in the system.	This can happen if the pressure switch is not functioning properly. If there is no water circulation, the boiler will not be able to heat adequately. Check the pressure switch to ensure it is in good condition.

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

Datasheet for the Cointra C30015300 flow meter

Catalogue reference: C30015300
Uniclima internal SKU: FELN24E
Brand: Cointra
Type of part: Flow detectors
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.

Code engraved on the body: 33900029
Batch / date: 316-14 / 19-A

Documentation

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

Frequently Asked Questions

Frequently asked questions about the flow meter C30015300

Is this pressure switch suitable for the Ferroli Domiproject C24?

Yes, the Domiproject C24 is on the list of boilers compatible with this part.

Does it also work for the Cointra Supreme 11 VI?

Yes, the Supreme 11 VI is among the boilers compatible with this pressure switch.

What fault indicates that the flow switch needs to be replaced in the Excellent D Micro LN 24 E?

That the boiler does not detect the flow of domestic hot water.

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Flow switch Cointra Excellent D Micro LN 24 E - Ref. C30015300 (code On Part 33900029)