K50 - Chauffe-eau et chaudière Keston - Free user manual and instructions
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| Product Type | Combi Boiler (Water Heater and Central Heating) |
| Brand | Keston |
| Model | K50 |
| Dimensions (H x W x D) | 700 x 400 x 300 mm |
| Weight | 30 kg |
| Power Supply | 230 V / 50 Hz |
| Maximum Heating Power | 24 kW |
| Maximum Hot Water Flow Rate | 12 L/min |
| Energy Efficiency Rating | A |
| Fuel Type | Natural Gas / LPG |
| Central Heating Max Pressure | 3 bar |
| DHW Temperature Range | 35 - 60 °C |
| Main Functions | Central heating and domestic hot water production; frost protection; summer/winter mode |
| Maintenance | Annual service recommended by a qualified engineer; check pressure gauge regularly |
| Safety Features | Overheat protection; flame failure device; pressure relief valve; anti-freeze function |
| Spare Parts & Repairability | Widely available; user-replaceable parts: expansion vessel, pump, thermistor; professional repair required for gas components |
| Noise Level | < 50 dB(A) |
| Installation Type | Wall-mounted |
Frequently Asked Questions - K50 Keston
How do I reset the Keston K50 boiler?
Press and hold the reset button (usually red) for 3 seconds until the flame symbol appears. If the boiler does not ignite, check gas supply and pressure.
What does the error code E01 mean?
Error E01 indicates a flame detection failure. This may be due to a blocked burner or faulty ignition electrode. Contact a qualified technician.
How often should I service the K50 boiler?
It is recommended to have an annual service by a Gas Safe registered engineer to ensure safe and efficient operation.
What pressure should the heating system be?
The normal operating pressure is between 1.0 and 1.5 bar when cold. If it drops below 0.5 bar, repressurise using the filling loop.
Can I use the K50 boiler without central heating?
Yes, you can set the boiler to summer mode (hot water only) by switching the mode selector to the water tap symbol.
Why is my hot water temperature fluctuating?
Fluctuations may be due to scale build-up in the heat exchanger or a faulty thermistor. Descale or replace the thermistor if needed.
How do I bleed my radiators?
Use a radiator key to open the bleed valve slightly until air escapes and water starts to flow. Close the valve once the hissing stops.
Is the Keston K50 compatible with smart thermostats?
Yes, it is compatible with most 24 V OpenTherm smart thermostats. Refer to the manual for wiring instructions.
What should I do if I smell gas?
Immediately turn off the gas supply at the meter, open windows and doors, do not use electrical switches, and call the national gas emergency number (0800 111 999 in UK).
How can I improve the energy efficiency of my boiler?
Set the heating flow temperature to 60-65 °C for condensing operation, use a programmable thermostat, and ensure your home is well insulated.
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