Step 1

Check the radiator. If the mountain is cold, warm and the bottom, it means that the heater must be ventilated. In addition, the heater requires venting, when all is cold, or have a lower temperature than the thermostat setting.
Step 2

Turn the central heating system, thus preventing any accidents and to keep yourself safe
work. Turn the whole system – not enough to turn the thermostat temperature selector.
Step 3

Find a special key that matches the valve serving to vent. Most heaters have this type of valve on the side or rear. This valve requires a special key to open and close.
Step 4
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Fold the cloth around the key and valve. Turn the key in the opposite direction to traffic
clockwise to open the valve and get rid of the air heater – you’ll hear the distinctive hiss. Leave the valve open until the water starts to escape from the valve in a bubble.
Step 5

Turn the key in a clockwise direction to close the valve. Make sure it is properly closed. However, you should not close it too tightly. Turn on the central heating system and make sure heaters work as they should.