Name: Saunier Duval Micraplus Condens 25-A Circulating Pump Ref. 0020186158
Brand: Hermann
SKU: BCCMC25A
Price: 110 EUR
Availability: InStock

Question 1

How do I know if this circulating pump is the one for my boiler?

Accepted Answer

Verify the reference 0020186158 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Wilo piece.

Question 2

What is it used for?

Accepted Answer

The circulating pump circulates the water through the heating circuit.

Question 3

Noise, water not circulating, or cold radiators?

Accepted Answer

Typical symptoms: humming, seized rotor after a long stop, or radiators that do not heat evenly.

Question 4

Which models is it suitable for?

Accepted Answer

Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.

Question 5

Installation and recommendations

Accepted Answer

Bleed the air from the circuit and the pump; check the pressure at 1–1.5 bar with the boiler cold.

Question 6

What does refurbished mean and what coverage does it have?

Accepted Answer

Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

Question 7

What does fault code F.89 mean in Hermann?

Accepted Answer

Error: pump The heating pump is disconnected, poorly connected, or short-circuited; the electronics detect a specific circulator fault. Check by measuring voltage/continuity at the pump connector and forcing a function test.

Question 8

What does fault code F.23 mean in Hermann?

Accepted Answer

Safety shutdown: temperature variation too large (NTC1/NTC2) Blocked pump or reduced power causes insufficient circulation and an excessive flow/return ΔT. Check by forcing degassing (P.06/P.07), feeling for pump vibration/noise, and checking flow/air in the circuit.

Question 9

What does fault code F.24 mean in Hermann?

Accepted Answer

Safety shutdown: temperature rise too fast If the pump does not circulate flow, the heat is not dissipated and the temperature rise is very rapid. Check by activating pump tests (P.06/P.07), checking voltage at the pump, and bleeding the system.

Question 10

What does the fault code F.75 mean in Hermann?

Accepted Answer

Error: pressure sensor In these models, the unit expects to see a pressure increase when the pump starts; if the circulator is blocked or does not start, there is no variation and F.75 appears. Check that the pump is rotating/powered and that the Δp increases when circulation begins.

Code	What does it mean?	Cause and diagnosis (this part)
F.89	Error: pump	The heating pump is disconnected, poorly connected, or short-circuited; the electronics detect a specific circulator fault. Check by measuring voltage/continuity at the pump connector and forcing a function test.
F.23	Safety shutdown: temperature variation too large (NTC1/NTC2)	Blocked pump or reduced power causes insufficient circulation and an excessive flow/return ΔT. Check by forcing degassing (P.06/P.07), feeling for pump vibration/noise, and checking flow/air in the circuit.
F.24	Safety shutdown: temperature rise too fast	If the pump does not circulate flow, the heat is not dissipated and the temperature rise is very rapid. Verify by activating pump tests (P.06/P.07), checking voltage at the pump, and bleeding the system.
F.75	Fault: pressure sensor	In these models, the unit expects to see a pressure increase when the pump starts; if the circulator is blocked or does not start, there is no variation and F.75 appears. Check that the pump is rotating/powered and that the Δp increases when circulation begins.

Saunier Duval Micraplus Condens 25-A Circulating Pump Ref. 0020186158

Key Data

Micraplus Condens

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