To fill water into the Junkers Cerastar, you will need to locate the water inlet valve on the boiler. This valve is usually located on the bottom of the boiler and can be opened by turning it counterclockwise. Once the valve is open, you can use a hose or a funnel to pour water into the boiler. Be sure to monitor the water level and close the valve once the desired level is reached. It's important to follow the manufacturer's instructions and safety guidelines when filling water into the boiler. **

The water supply for your Junker Cerastar gas boiler can typically be found near the boiler itself. Look for a cold water pipe connected to the boiler, usually with a shut-off valve nearby. This pipe is the main water supply for the boiler and is used to fill the system and provide water for heating. If you are unable to locate the water supply, refer to the boiler's manual or contact a professional for assistance. **

To refill the expansion vessel of the Junkers Cerastar ZWR 18-5 AE 23 gas boiler, you will first need to turn off the boiler and allow it to cool down. Locate the pressure relief valve on the boiler and slowly release the pressure until it reaches zero. Once the pressure is released, use a bicycle pump or an air compressor to refill the expansion vessel to the recommended pressure level, typically around 1-1.5 bar. Finally, close the pressure relief valve and turn the boiler back on to check if the pressure is stable. **

To fill the expansion vessel of the Junkers Cerastar ZWR 185 AE 23 gas boiler, you will need to locate the vessel which is usually located near the boiler. First, make sure the boiler is turned off and the system is cool. Then, locate the valve on top of the expansion vessel and slowly open it to allow water to fill the vessel. You can use a hose connected to a tap to fill the vessel until the pressure gauge on the boiler reaches the recommended level. Be sure to close the valve tightly once the vessel is filled. **

The possible cause of pressure loss in your gas boiler Junkers Cerastar ZWR 185 AE 23 could be a leak in the system, such as a damaged pipe or a faulty pressure relief valve. Another potential cause could be air trapped in the system, which can lead to a drop in pressure. It's also possible that there is a problem with the expansion vessel, which is responsible for maintaining the correct pressure in the system. It's important to have a professional technician inspect and diagnose the issue to ensure it is properly addressed. **

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