- Heat pumps
- Air-to-water heat pump
F718
Saunier Duval F.718 on a Genia Air Max heat pump: fan blocked
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On the Genia Air Max, F.718 means the outdoor unit fan sends no speed signal after several restarts. Clear snow or leaves from the grilles from outside without opening the unit and, if it returns, call a competent person.
Safety first
Stop and check this first
- The Genia Air contains flammable R290 refrigerant. Saunier Duval forbids ignition sources such as plug sockets, switches or lamps in the protective area around the outdoor unit. Do not open the casing.
Safe checks you can perform
- Message on the tower display
- Snow and leaves at the grilles
- Fan, connector and board
Leave these tasks to a qualified professional
- Do not attempt this professional task: Fan test before replacing the motor
- Do not attempt this professional task: Leak check before opening
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Fan test before replacing the motor
What they doThe competent person runs the fan from the diagnostics menu and checks the connector and signal wiring.
They must show youthe fan turning in the test and the rpm reading.
In writingwhat was measured, what was replaced and why.
Leak check before opening
What they doBefore opening the outdoor unit, the competent person checks with an R290 rated gas detector that there is no leak.
They must show youthe detector used and its no leak reading.
In writingthe leak check and the final test with no F.718.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Message on the tower display
- Who:
- you.
- How:
- read the display and note whether it shows F.718, F.785 or status S.252.
- Result that matters:
- S.252 is the automatic restart every 15 minutes; F.718 is the lockout after four attempts.
- If you only see S.252:
- the unit is still retrying; watch whether it reaches F.718.
- If you see F.718 or F.785:
- fan 1 or fan 2 did not start; check the air path.
- Evidence to keep:
- a photo of the display with date and time.
Evidence: Saunier Duval GeniaSet FW 200-6 y FEW 200-6, instrucciones de funcionamiento, instalación y mantenimiento 0020291590_01 · Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
Snow and leaves at the grilles
- Who:
- you, from outside.
- How:
- remove snow from the air inlet and outlet grilles and leaves gathered around the unit, as the manufacturer lists in product care. Do not push anything between the blades.
- Result that matters:
- that the grilles are clear and no ice is holding the fan.
- If there was a blockage and the code does not return:
- the blockage was the likely cause.
- If there was nothing or the code returns:
- a visible blockage is ruled out; call a competent person.
- Evidence to keep:
- photos of the grilles before and after.
Evidence: Saunier Duval GeniaSet FW 200-6 y FEW 200-6, instrucciones de funcionamiento, instalación y mantenimiento 0020291590_01 · Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
Fan, connector and board
- Who:
- a competent person.
- How:
- after checking with a gas detector that there is no R290 leak, they open the unit, inspect the fan motor, connector and speed signal, and run the fan from the diagnostics menu.
- Result that matters:
- whether the fan turns when commanded and whether the board reads its rpm.
- If it does not turn with a clear path:
- a motor or supply fault is confirmed.
- If it turns and the board reads no rpm:
- the signal cable or the board is the suspect.
- Evidence to keep:
- a job sheet with the test done and the part involved.
Flammable R290 refrigerant and mains voltage: isolate all poles, wait at least 3 minutes and check for leaks before opening. Competent person only.
Evidence: Saunier Duval GeniaSet FW 200-6 y FEW 200-6, instrucciones de funcionamiento, instalación y mantenimiento 0020291590_01 · Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Heat pumps
- Brand
- Saunier Duval
- Product type
- Air-to-water heat pump
Known code variants
- aroTHERM F.718
- aroTHERM plus F718
- Genia Air F.718
- Genia Air Max F718
- Saunier Duval F718
- Vaillant F718
What it means
Saunier Duval explains F.718 as the missing confirmation signal that fan 1 is turning. Status S.252 acts first: with the fan at 0 rpm the heat pump switches off for 15 minutes and restarts; after four failed restarts it shows F.718. The remedy it gives is to check the air duct and remove the blockage. If the path is clear, the fault may be in the motor, the signal cable or the board, and the code does not say which.
Warnings and stop conditions
- Highsource verified
The Genia Air contains flammable R290 refrigerant. Saunier Duval forbids ignition sources such as plug sockets, switches or lamps in the protective area around the outdoor unit. Do not open the casing.
Evidence: Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
Symptoms and causes
Probable causes · in order
- Blocked air pathCommon
Snow, ice, leaves or branches stop the blades or cover the grille. It is visible from outside and is the first thing Saunier Duval asks to check.
Evidence: Saunier Duval GeniaSet FW 200-6 y FEW 200-6, instrucciones de funcionamiento, instalación y mantenimiento 0020291590_01 · Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
- Motor or speed signalPossible
With a clear path and a repeated code, the signal is missing because of the motor, its connector or the cable. Only a competent person with the unit open separates them.
Evidence: Saunier Duval GeniaSet FW 200-6 y FEW 200-6, instrucciones de funcionamiento, instalación y mantenimiento 0020291590_01 · Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
- Outside windLess common
Saunier Duval shows S.287 when wind turns the fan at 50 rpm or more before start. It is a different status from F.718 and does not explain it.
Evidence: Saunier Duval GeniaSet FW 200-6 y FEW 200-6, instrucciones de funcionamiento, instalación y mantenimiento 0020291590_01 · Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
Virtual technician
Does F718 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
- 2
Saunier Duval Genia Air HA 4-6 a HA 15-6 O B3, instrucciones de la unidad exterior 0020297943_00
Saunier Duval · 2020 · manual
Was this entry useful?