We have a older house that we just bought about a year ago. for most of the winter our heater,although old has heated the whole house very well, until about a month and a half ago. we stopped getting heat on the 2nd and 3rd floor. the boiler lines are split into 2 zones. 1st floor and 2&3rd floor. we have tried to purge the 2nd&3rd floor loop of any air pockets that may exist but it seems the system is not filling back up with water. there are only purge valves in the basment, none on the third floor to let the air escape.
Do we need a self tapping&sealing bleeder valve installed on the third floor.
or does this sound like our circulator pump is failing?
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