Saunier Duval Themaclassic F35E

Questions and Answers

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eduardorichardsAug 14, 2025
How to troubleshoot a Saunier Duval Boiler with no display on the control panel?
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  Raymond TurnerAug 14, 2025
  If there is no display on the control panel of your Saunier Duval Boiler, check the 230V supply, the PCB fuse, and the connection between the PCBs.
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janebutlerAug 17, 2025
What to check if the fan does not start on my Saunier Duval Boiler?
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  Mark SmithAug 17, 2025
  If the fan on your Saunier Duval Boiler doesn't start, check the continuity of the fan harness.
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jeanjacksonAug 20, 2025
What to do when the fan runs but there are no sparks in my Saunier Duval Themaclassic F35E?
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  Leonard HawkinsAug 21, 2025
  If the fan runs but there are no sparks in your Saunier Duval Boiler, check the continuity of the ignition components (electrodes and leads) and verify the power supply from the PCB to the ignition unit.
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Robert ObrienAug 25, 2025
What to do if my Saunier Duval Boiler burner doesn't light with a spark?
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  Susan CortezAug 25, 2025
  If the burner on your Saunier Duval Boiler doesn't light despite an ignition spark, first, ensure the gas taps are turned on. If the issue continues, inspect the wiring. If problems persist, consider replacing the control board (PCB). Also, test the gas control valve.
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Sharon SmithAug 27, 2025
Why is my Saunier Duval Boiler not giving hot water or heating with a red flashing light?
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  jaimejonesAug 27, 2025
  If your Saunier Duval Boiler (F30E/F35E models) isn't providing domestic hot water or central heating, and you see a red flashing warning light with a fault code, check for loose connections on the control board (PCB) and the air pressure switch (both electrical connections and tubes). Also, check the water pressure. Other potential causes include a shortage of air or gas, a faulty temperature sensor, or overheating. Inspect the control or interface boards (PCBs) as well.
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Mary WestAug 31, 2025
How to fix a Saunier Duval Themaclassic F35E when the burner lights then goes out (F1 or F4 error)?
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  Brian JonesAug 31, 2025
  If your Saunier Duval Boiler's burner lights and then goes out (F1 or F4 fault), turn off the power and check the continuity between the flame sense electrode and terminal H2.4 on the control board (PCB). Inspect the connector on the wire's end and ensure the spark electrode is correctly positioned towards the flame. Check the spark electrode and consider replacing it. If the issue remains, the control board (PCB) may be faulty and need replacement.
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Monica LindseySep 3, 2025
What causes a Saunier Duval Themaclassic F35E Boiler to light then go out with no flame detected (F1 error)?
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  Brian ColemanSep 3, 2025
  If your Saunier Duval Boiler burner lights but then goes out, and no flame is detected (F1 fault), try cleaning the gas filter and the burner.
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Denise JohnstonSep 6, 2025
How to increase room temperature with a Saunier Duval Boiler when radiators are luke-warm?
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  Joe JohnsonSep 6, 2025
  If the room temperature is inadequate and the radiators are only luke-warm when using your Saunier Duval Boiler, increase the temperature settings.
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John SmithSep 10, 2025
Why is the water luke-warm at the taps with my Saunier Duval Themaclassic F35E Boiler?
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  Christopher KingSep 10, 2025
  If the water at the taps is only luke-warm when using your Saunier Duval Boiler, verify that the 3-way valve isn't allowing water to pass into the radiators (the radiators should remain cold in Summer mode).