What does fault code F.23 mean in Saunier Duval?

Safety shutdown: excessive temperature variation A blocked or underpowered pump reduces the flow rate and causes the ΔT flow/return to rise excessively; check that the pump is rotating, its consumption/PWM signal, and bleed the circuit.

What does the fault code F.24 mean in Saunier Duval?

Safety shutdown: temperature rise too fast If the pump is blocked or underperforming, the power is not evacuated and the primary temperature rises very quickly; check the pump's rotation/electrical consumption, bleed air, and confirm the installation pressure.

What does the fault code F.75 mean in Saunier Duval?

Pump error, lack of water At start-up, the PCB does not detect the expected pressure increase if the pump does not start or does not generate flow; check the pump's power/signal and the pressure increase during the diagnostic test, as well as bleed.

RefurbishedSaunier Duval Pumps

Saunier Duval Isofast Condens F30 B 1 Circulating Pump Ref. 0020084525

Name: Saunier Duval Isofast Condens F30 B 1 Circulating Pump Ref. 0020084525
Brand: Saunier Duval
SKU: BCCICF30
Price: 120 EUR
Availability: InStock

120 €VAT includedIn stock · 1 unit

Circulating pump: reconditioned spare part that circulates water in the heating circuit. Useful if there is noise, water is not circulating, or radiators do not heat evenly. Reference 0020084525. 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: 0020084525
Brand: Saunier Duval
Type of part: Pumps
Available units: 1 unit 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)
F.23	Safety shutdown: excessive temperature variation	A blocked or reduced power pump decreases the flow rate and causes the ΔT flow/return to rise excessively; check that the pump is rotating, its consumption/PWM signal, and bleed the circuit.
F.24	Safety shutdown: temperature rise too fast	If the pump is blocked or underperforming, the power is not evacuated and the primary temperature rises very quickly; check the pump's rotation/electrical consumption, bleed air, and confirm the installation pressure.
F.75	Pump error, lack of water	At start-up, the PCB does not detect the expected pressure increase if the pump does not start or does not generate flow; check the pump's power supply/signal and the pressure increase during the diagnostic test, as well as bleed.

Saunier Duval Isofast Condens F30 B 1 Circulating Pump Ref. 0020084525

Key Data

Spare Parts Related Boiler Isofast Condens F30 B 1