My heater has a hard time staying on. It warms just fine and stays on enough to warm the house.. but when it clicks on it has a clicking sound that it makes and sounds like it just wants to stop all together. We changed out both filters on it but still makes that sound? What could it be?

nervous wife, March 2010

we need to know make of boiler and type and age of system at least before being able to help here

john, March 2010