Why would my circulator pumb keep going out?

[jeffsnavien240ncb]

It is a brand new system & I am getting ready to get a 3rd pump. It has only been 2 months since the system has been in service.
we have 160 feet of baseboard in a 1400 sq foot 2 story house.
we have a TACO 1/10 hp 2400. They work geteat the house is warm but they are noisy. They make the sound of bad bearings. They have given us a free replacement but I am thinking I do not want a 3rd one.

 

[jeffsnavien240ncb]

any suggestions, I need a pump that I don't have to have changed.
thanks

 

[Sponsor]

 

[Tom Sawyer]

I'm thinking its an air problem, not a pump problem.

 

[jeffsnavien240ncb]

thanks for the input:
may I please address your thought?
Air?
as in the water system, not air input?
Air in the system, 1st the Navien self purges air upon start up. (seems to do pretty well )
2nd We have new bleeder installed on all stations. me & wife bleed it well all stations are warm, & do not hear funny noise in pipes.

AIR: input? I am allowed 150' it is all new sealed, free & clear, 15' run 3" dia, I don't think you mean input though.
thanks for your reply

 

[BadgerBoilerMN]

This is considered a commercial pump, roughly 4 times more than you likely need.

Who designed the system? Which Navien? Primary/Secondary? Multi-zone?

 

[jeffsnavien240ncb]

0

This is considered a commercial pump, roughly 4 times more than you likely need.

Who designed the system? Which Navien? Primary/Secondary? Multi-zone?

the pump we had on our last system was the 1/12 hp B&G we are using the same base boards. I see in the spec that the head of the B&G 1/12 is like 8'if I remember correctly. The Taco 2400 1/10 head is a little higher, & maybe cfm is a little higher. When I talked to the Taco engineers, they said that if the system was gated down it would not hurt the taco. What pump would you suggest?
EDIT:
navine 240/1 zone
^^^^^^^^^^^^