What does fault code A03 mean in Cointra?

Overtemperature protection activation. If the circulating pump is blocked, not rotating, or not delivering flow, the supply line overheats quickly and triggers the protection. Check the voltage and consumption of the pump, rotor rotation, and bleed air from the circuit to confirm lack of circulation.

What does the F43 code mean in Cointra?

Intervention of the heat exchanger protection. The absence of circulation in the primary due to a faulty/stuck pump causes local overheating of the heat exchanger. Check the electrical supply and rotation of the pump, bleed the circuit, and ensure flow reappears when it is unblocked.

RefurbishedCointra Pumps

Cointra Excellent D Micro LN 24 E Circulating Pump Ref. 39818451

Name: Cointra Excellent D Micro LN 24 E Circulating Pump Ref. 39818451
Brand: Cointra
SKU: BCEMLN24E
Price: 85 EUR
Availability: InStock

85 €VAT includedIn stock · 5 units

Circulating pump: refurbished spare part that circulates the water in the heating circuit. Useful if there is noise, the water does not circulate, or the radiators do not heat evenly. Reference 39818451. Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Delivery in 2–4 working days

1-year warranty

14-day return

Technical support

Key Data

Reference: 39818451
Brand: Cointra
Type of part: Pumps
Available units: 5 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

Code	What does it mean?	Cause and diagnosis (this part)
A03	Overtemperature protection activation.	If the circulating pump is blocked, not rotating, or not delivering flow, the supply line overheats quickly and triggers the protection. Check the voltage and consumption on the pump, rotor rotation, and bleed air from the circuit to confirm lack of circulation.
F43	Intervention of the heat exchanger protection.	The absence of circulation in the primary due to a faulty/stuck pump causes local overheating of the heat exchanger. Check the electrical supply and rotation of the pump, bleed the circuit, and ensure flow reappears when it is unblocked.

Cointra Excellent D Micro LN 24 E Circulating Pump Ref. 39818451

Key Data

Spare Parts Related Boiler Excellent D Micro LN 24 E