- Boilers
- Electric water heater
241
Ariston 241 on a Nuos Plus heat pump water heater: impressed current anode open circuit
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On an Ariston Nuos Plus, 241 means an open circuit on the impressed current anode and stops both the heat pump and the electric element. The first thing Ariston asks is to check that there is water inside the appliance; then call the technician.
Safety first
Stop and check this first
- With 241 neither group heats, including the element used for frost protection. If the heater is in a room that can freeze and will stand unused, Ariston says to drain it; ask the technician to do so.
- Ariston reserves maintenance and repairs for authorised personnel with suitable equipment. Do not open the covers: inside there is mains voltage and the refrigerant circuit.
Safe checks you can perform
- Which heating group still works
- Water inside the heater
- Anode, wiring and board
Leave these tasks to a qualified professional
- Do not attempt this professional task: Anode circuit diagnosis
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.
Anode circuit diagnosis
What they doThe technician follows Ariston's sequence: water in the tank, anode, wiring and, last, the board.
They must show youwhich point of the circuit was open.
In writingthe cause, the part replaced and why the earlier steps were ruled out.
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.
Which heating group still works
- Who:
- you.
- How:
- look at the display: Ariston says that if the error is in the heat pump, the HP symbol flashes; if it is in the electric element, the element symbol flashes; if both are affected, both flash. Take a photo showing code 241.
- Result that matters:
- Ariston explains that the heater keeps supplying hot water if the error affects only one of the two heating groups.
- If only HP flashes:
- the electric element keeps heating; you will have hot water until the technician arrives.
- If the element symbol or both flash:
- you may have no hot water; book the visit as soon as possible.
- Evidence to keep:
- a photo of the display with the code and the flashing symbols.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
Water inside the heater
- Who:
- you.
- How:
- open a hot tap and check that water flows steadily, without air; check that the heater's shut-off valves are open.
- Result that matters:
- Ariston asks for a check that there is water inside before any other check.
- If no water flows or it spits air:
- open the valves, run the tap until water flows without air and reset with ON/OFF.
- If water flows normally and 241 remains:
- the cause is the anode, its wiring or the board; move on to the technician.
- Evidence to keep:
- a note of any water cut or drain-down and a photo of the code.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
Anode, wiring and board
- Who:
- an authorised Ariston service technician.
- How:
- with the appliance disconnected, checks the impressed current anode, how its cable is fitted in the main board connector and, if both are fine, the board.
- Result that matters:
- where the circuit is open.
- If the cable was poorly fitted or the anode has failed:
- that cause is confirmed if 241 does not return after the fix.
- If anode and wiring are fine:
- Ariston says to replace the main board.
- Evidence to keep:
- a job sheet of what was checked and the reference of the part replaced.
The anode sits in the tank and is wired to the board: technician work with the unit disconnected.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
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
- Boilers
- Brand
- Ariston
- Product type
- Electric water heater
Known code variants
- Ariston error 241
- Ariston Nuos error 241
- Error 241 Ariston
- Nuos 241
What it means
Ariston links 241 to an open circuit on the impressed current anode, the titanium impressed current anode in the tank. With this error both the element and the heat pump go OFF. The first action it gives is to check whether there is water inside the product; if the error persists, check the anode and how its wiring is fitted in the main board connector and, as a last step, replace the board. The code does not say which of them has failed.
Warnings and stop conditions
- Mediumsource verified
With 241 neither group heats, including the element used for frost protection. If the heater is in a room that can freeze and will stand unused, Ariston says to drain it; ask the technician to do so.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
- Highsource verified
Ariston reserves maintenance and repairs for authorised personnel with suitable equipment. Do not open the covers: inside there is mains voltage and the refrigerant circuit.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
Symptoms and causes
Probable causes · in order
- Tank without waterCommon
Ariston puts it first: without water the anode circuit is open. It happens after a water cut or a drain-down.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
- Anode or its wiringPossible
If there is water and the error persists, Ariston has the anode and the cable at its connector checked.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
- Main boardLess common
Ariston only suggests replacing it if the error persists after water, anode and wiring have been checked.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
Virtual technician
Does 241 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
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