Clas One 35 - Water heaters and boilers Ariston Thermo - Free user manual and instructions
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| Type | Gas condensing boiler |
| Model | Clas One 35 |
| Brand | Ariston Thermo |
| Category | Water heaters and boilers |
| Heat Output | 35 kW |
| Fuel Type | Natural gas (LPG convertible) |
| Mounting | Wall-hung |
| Electrical Supply | 230V / 50Hz |
| Dimensions (H x W x D) | Approx. 700 x 400 x 250 mm |
| Weight | Approx. 30 kg |
| Main Functions | Central heating and domestic hot water |
| Energy Efficiency | Condensing technology for high efficiency |
| Water Pressure | 1-3 bar operating pressure |
| Temperature Range | 35-60°C for heating |
| Maintenance | Annual service by qualified engineer |
| Cleaning | Wipe exterior with damp cloth; keep vents clear |
| Safety Features | Overheat protection, safety valve, flame failure device |
| Spare Parts | Original spare parts available from Ariston service centers |
| Repairability | Modular design for easy access to components |
| Manual | Free manual available in PDF on notice-facile.com |
Frequently Asked Questions - Clas One 35 Ariston Thermo
How do I reset the boiler after an error?
To reset your Clas One 35, press and hold the reset button (often marked with a resettable icon) for 3-5 seconds. This clears most temporary faults. If the error persists, check the pressure and condensate pipe. Always refer to the user manual for specific error codes.
What is the recommended water pressure for the boiler?
The recommended operating water pressure is between 1 and 1.5 bar when cold. If it drops below 1 bar, use the filling loop to repressurize. Do not exceed 3 bar, as the safety valve may activate.
Why is my boiler not heating the house?
Common causes include low water pressure, a locked pump, air in the system, or the thermostat set too low. Check the pressure gauge and ensure the thermostat is calling for heat. If you see error codes, consult the manual.
How often should the boiler be serviced?
The Clas One 35 should be serviced annually by a qualified engineer to maintain efficiency and safety. Regular servicing prevents breakdowns and ensures warranty validity.
Can the boiler be used with LPG?
Yes, the Ariston Clas One 35 can be converted to run on LPG. Conversion must be performed by a certified technician using the appropriate conversion kit.
How do I bleed a radiator when the boiler is on?
Turn off the heating and wait for the system to cool. Use a radiator key to open the bleed valve slightly until water escapes, then close it. Re-pressurize the boiler if needed.
What does error code 501 mean?
Error 501 typically indicates a flame detection problem. Check that the gas supply is on and that the ignition electrodes are clean. Contact a professional if the issue persists.
Is the Clas One 35 suitable for a large house?
With a 35 kW output, the Clas One 35 is ideal for medium to large homes with a high hot water demand. It can support multiple radiators and provide good hot water flow.
How do I clean the exterior of the boiler?
Use a soft damp cloth with a mild detergent to wipe the casing. Do not use abrasive cleaners or spray water directly on the boiler.
Where can I find spare parts?
Genuine spare parts are available from authorized Ariston service centers and select online retailers. Always quote the model number and serial number.
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USER MANUAL Clas One 35 Ariston Thermo
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Product information
Brand : Ariston Thermo
Model : Clas One 35
Category : Water heaters and boilers