Plumbing Questions? Ask a Plumber for Answers ASAP
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To clear a airlock all you have to do is keep the faucet open and the water pressure will push the air trapped out the faucet. However, this is not the problem and the most likely cause is the hot water heater that is filling with cold water so it can heat it up. Wait a few hours and if the condition still exist let me know. Also, check around the water heater for leaks as well and the dishwasher.
You are quite welcome. A back boiler still has a water holding reservoir and if this isn't working properly the water flow can be reduced. A combi boiler has no storage and is an instant hot water producer so as above the water heater can be the problem.