- Boilers
- Electric water heater
230
Ariston 230 on a Nuos Plus heat pump water heater: water temperature sensor near the element
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
On an Ariston Nuos Plus, 230 means the water temperature sensor in the heating element area is open or short circuited. Both the heat pump and the element stop, so you have no hot water. Book a technician visit.
Safety first
Stop and check this first
- With 230, frost protection by the electric element does not work. 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
- Restart and frost protection
- Connector and sensor measurement
Leave these tasks to a qualified professional
- Do not attempt this professional task: Connector and sensor check
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.
Connector and sensor check
What they doThe technician checks the sensor connector on the main board and measures the sensor, in the order Ariston gives.
They must show youthe measured value and a photo of the connector.
In writingthe cause and the part replaced, if any.
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 230.
- 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
Restart and frost protection
- Who:
- you.
- How:
- switch the heater off with ON/OFF and back on; if the room is cold, note its approximate temperature.
- Result that matters:
- with 230 neither group heats; Ariston explains that frost protection uses the element to heat the water when it drops below 5 °C, and here the element is stopped.
- If 230 clears:
- note the date and watch whether it returns.
- If 230 stays and the room can freeze:
- book an urgent visit; Ariston says to drain the appliance if it will stand unused in a room at risk of frost.
- Evidence to keep:
- a photo of the code and a note of the room temperature.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
Connector and sensor measurement
- Who:
- an authorised Ariston service technician.
- How:
- with the appliance disconnected, checks how the sensor wiring is fitted in the main board connector and measures the sensor with a multimeter.
- Result that matters:
- whether the fault is in the connector or the sensor.
- If the connector was poorly fitted:
- correcting it confirms the cause if 230 does not return.
- If the connector is fine and the sensor measures out of specification:
- the sensor is confirmed.
- Evidence to keep:
- a job sheet with the measured value and a photo of the connector.
Mains voltage and the R290 circuit inside the unit. Technician only.
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 230
- Ariston Nuos error 230
- Error 230 Ariston
- Nuos 230
What it means
Ariston links 230 to the water temperature sensor in the heating element area when the control reads it as an open or short circuit. Unlike other Nuos Plus errors, here both the element and the heat pump go OFF. The actions it gives are to check that the sensor wiring is correctly fitted in its connector on the main board and to check that the sensor works. The code does not distinguish sensor, cable and connector.
Warnings and stop conditions
- Mediumsource verified
With 230, frost protection by the electric element does not work. 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
- Element area sensor open or short circuitedCommon
This is Ariston's condition for 230. It is confirmed by measuring the sensor.
Evidence: Ariston Nuos Plus S2 Wi-Fi, calentador de agua con bomba de calor: instrucciones para la instalación, el uso y el mantenimiento
- Wiring poorly fitted at the board connectorPossible
Ariston has the wiring at its connector checked first. It is common after recent work on the unit.
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 230 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
Was this entry useful?