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Hi. I'm not an expert but most of my boilers in the past get noisy when they get air in the system. Underneath your boiler will be an inlet tap to top up the sysem with water. Make sure you bleed all of your radiators of air till they squirt water then keeb topping up the system and bleeding till no air remains in any of the radiators. There should be a pressure dial on the front of your boiler and there is usually a red fixed needle which shows what the opperating pressure is. I would do this before anything else and see if this solves the problem. :-)
You're probably getting what some call gurgling sounds because there is air in the system. You need to bleed the air out at all bleed ports starting with the lowest in the system and ending with the highest.It won't hurt if you do that process a couple of times. Once all the air is out, you should have a normal convection flow of water through the system. - Good luck!
Whining = pump bearings Pressure reduction = pressure relief valve diaphragm either perished of gunged up - look for water coming out of the overflow pipe from the valve leak in ch system look at all joints
there should be a pressure rellief valve fitted.
it also sounds like the heat exchanger is blocked if the hot water is not as good as it used to be and the boiler reaches temperature too quickly then there is scale in the heat exchanger and needs to be cleaned or replaced
Is your boiler heating your domestic hot water if so i would turn water off to water maker and see if your boiler pressure stays down below 20 psi. If so water maker is bad. The other thing that could cause this problem would be the boiler pump is out.
the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim