Probably due to an airlock in the cold water system (feed pipe).
It could be a number of issues ..... blocked matrix (behind dash) An airlock in the water system, A leaky head gasket, A seized thermostat
To make an airlock for your fermentation process, you can use a simple setup with a fermentation vessel and a water-filled airlock. The airlock allows carbon dioxide to escape while preventing outside air from entering, which helps maintain a controlled fermentation environment. You can easily create an airlock by attaching a rubber stopper with a hole to the fermentation vessel and inserting a plastic or glass tube filled with water into the hole. This setup allows gas to bubble out without letting air in, ensuring a successful fermentation process.
By drip and sprinkler system
To make an airlock for your home brewing setup, you can use a simple device like a water-filled bubbler or a commercial airlock. This device allows carbon dioxide to escape during fermentation while preventing outside air and contaminants from entering your brew. Simply attach the airlock to the fermenter and fill it with water or sanitizer to create a barrier. This will help maintain a controlled environment for your brewing process.
By shutting off the water supply and replacing the valve
An airlock is a device which permits the passage of people and objects between a pressure vessel and its surroundings while minimizing the change of pressure in the vessel and loss of air from it.
In area where water supply is poor during periods of peak demand what type of system would usually be specified for the domestic dwelling?
A drainage system for carrying surface water and sewage for disposal.
Are you asking about HEATING H/ W or domestic?
Liquid sodium
secondary cold water system