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

Safety shutdown: excessive temperature variation. The circulation pump being blocked or having insufficient performance prevents circulation and causes abnormal thermal differences; check if the pump starts/consumes and measure ΔT flow-return after bleeding.

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

Safety shutdown: temperature rise too quickly. If the pump does not circulate flow (blocked or low power), the primary heats up very quickly; check the pump's start-up/consumption in test mode and ensure there is no air in the circuit.

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

Pump error, lack of water. At start-up, the pressure increase generated by the pump is not detected due to a defective/blocked pump or dry running; check pressure increase at start-up, direct test of the pump and the pressure sensor.

RefurbishedSaunier Duval Pumps

Saunier Duval Thema NOx F 24 Circulating Pump Ref. H150100109

Name: Saunier Duval Thema NOX F 24 Circulating Pump Ref. H150100109
Brand: Saunier Duval
SKU: BCTNOXF24
Price: 90 EUR
Availability: InStock

90 €VAT includedIn stock · 1 unit

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 H150100109. 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: H150100109
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 underperforming circulating pump prevents circulation and causes abnormal thermal differences; check if the pump starts/consumes and measure the ΔT flow-return after bleeding.
F.24	Safety shutdown: temperature increase too rapid.	If the pump does not circulate flow (blocked or with low power), the primary heats up very quickly; check the pump's start-up/consumption in test mode and ensure there is no air in the circuit.
F.75	Pump error, lack of water.	At the start, the pressure increase generated by the pump is not detected due to a defective/blocked pump or dry running; check the pressure increase at startup, perform a direct test of the pump and the pressure sensor.

Saunier Duval Thema NOx F 24 Circulating Pump Ref. H150100109

Key Data

Spare Parts Related Boiler Thema NOx F 24