Ideal Standard Concord 60

[Schoolie]

Hi, I've a rather old Ideal Standard Concord 60 that has suddenly stopped producing hot water. The pilot light is fine, and the boiler flash up when you switch to continuous, but then shuts down after about a minute. The pilot light stays on, so I assume the thermocouple is OK.
Any suggestions - other than buying a new boiler?

 

[Boilerman2]

Check the water pump and water level in the primary system

 

[Schoolie]

Check the water pump and water level in the primary system

Thanks for that. Just checked both, the tank is full and the pump is working.
Any other suggestions? PLease!!!!

 

[Weedrip]

A blocked cold feed could show a normal water level in the F&E and the pump could still be free to turn but may still not be moving water.

is the flow from the boiler very hot? as it shuts down the burner.

the likeliest problem is circulation from the description of symptom's