Why is Ariston NUOS PLUS 250 leaking from the pressure safety device?
It's normal for some water to drip from the pressure safety device of your Ariston Water Heater during the heating phase. To prevent this, install an expansion vessel on the delivery system. However, if the leak continues even after the heating phase, check the calibration of the device and the mains water pressure. Important: Never obstruct the device’s discharge outlet!
What to do if Ariston NUOS PLUS 250 has reduced heat pump operation?
If your Ariston Water Heater has reduced heat pump operation and the electrical heating element is almost always on, the “Time W” value might be too low (component depends on climatic conditions). If the installation was performed with a non-compliant electricity power supply (voltage too low), power the product with the correct voltage. If the evaporator is obstructed or frozen, make sure that the evaporator is clean. Also, check the display for error messages related to problems with the heat pump circuit.
How to fix insufficient hot water flow in Ariston NUOS PLUS 250?
If you're experiencing insufficient hot water flow from your Ariston Water Heater, check the circuit for leaks and the condition of the deflector on the inlet cold water pipe, as well as the integrity of the delivery hot water pipe. This is to identify any leaks or obstructions in the hydraulic circuit.
What to do if Ariston NUOS PLUS 250 has leaks in the refrigerant gas circuit?
If you suspect leaks or a partial obstruction in the refrigerant gas circuit of your Ariston Water Heater, switch the product ON in heat pump mode and use a leak detector for the specific type of gas to ensure there are no leaks. Also, check the condition of the evaporator, grille, and conduits to ensure they are clean, as the evaporator may be partially obstructed.
What to do if my Ariston NUOS PLUS 250 is making increased noise?
If your Ariston Water Heater is making more noise than usual, it could be due to an internal obstruction. Check the moving components of the unit and clean the fan and other moving parts that might be causing the noise. Also, check the components connected using mobile clamps, ensuring the screws are well tightened, as some components may be vibrating.
What to do if Ariston NUOS PLUS 250 Water Heater display is not working?
If you're having problems viewing the display on your Ariston Water Heater, or if the display is turning off, check the connection status and the correct operation of the PCBs, as there may be a failure or electrical connection problems between the motherboard and the interface PCB. Also, check the power supply, as there may be a power failure.
Why is Ariston NUOS PLUS 250 Water Heater water boiling?
If the water from your Ariston Water Heater is boiling, with possible steam from the taps, it could be due to a high level of limescale build-up in the boiler and components. Unplug the power supply, empty the appliance, remove the heating element sheath, and carefully clean the limescale from inside the boiler, taking care not to damage the enamel and the heating element sheath. Reassemble the product in its original configuration, and consider replacing the flange gasket. Also, check for NTC sensor errors.
Why does my Ariston Water Heater have a bad odor?
If a bad odor is coming from your Ariston Water Heater, it might be due to no siphon or an empty siphon. Install a siphon and ensure it contains the necessary amount of water.
What to do if Ariston Water Heater water is cold?
If the water from your Ariston Water Heater is cold or not hot enough, there might be several reasons. First, check if the temperature setting is low and raise it. If that's not the problem, look for error messages on the display and follow the instructions in the “Errors” table. Ensure there is an electrical connection, and the wires are not disconnected or damaged, checking the voltage on the power terminals and the condition of the wires. If installed with an EDF signal cable, check for a missing HC/HP signal by starting the “Boost” mode and verifying the HC/HP signal from the meter and the EDF cabling. If using a timer for a two-tier rate, ensure the day/night meter is working and the set time is sufficient to heat the water. Clean the grilles and ducts regularly to ensure sufficient a...
Read manual carefully, manufacturer not liable for improper use, installation by qualified personnel.
Keep packaging from children, user age/capacity restrictions, avoid touching when wet, burn hazard.
Mandatory safety valve, overpressure device maintenance, winterization, flammable materials, leaks.
Safety measures for installation, electrical connections, tool usage, and ladder safety.
Installer responsibilities, national regulations, and technical standards for compliance.
Warnings regarding qualified personnel and compliance with national regulations.
Specifies room volume, ventilation, and environmental conditions for installation.
Importance of suitable ducting for performance and airflow guidelines.
Procedures for filling the tank and selecting appropriate pipe materials.
Requirements for safety groups, water hardness, and preventing Legionella.
Warnings before access, power supply checks, and prohibited connections.
Troubleshooting guide with error codes, causes, and recommended actions.
General| Type | Heat Pump Water Heater |
|---|---|
| Capacity | 250 liters |
| Energy Efficiency Class | A+ |
| Refrigerant | R134a |
| Installation Type | Floor Standing |
| Max Operating Temperature | 62°C |
| Power Supply | 220-240V, 50Hz |
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