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What is the model of your boiler? How many circs do you have? is the burner firing?
Then you either have a bad connection between the relay and the circ or you have a bad relay.
The boiler is responding to the thermostat so if you have no power to the pump then the relay is bad. There is no other test.
Did you check the connections at the relay socket? Since the relay is also pulling in the gas valve (it's responding to the thermostat) and since you have a new relay you could have a bad relay socket or the connection to it. Did you check the pump connection to neutral?
Neutral is the white wire to the pump. Trace it back to where it connects to the line in nuetral
It's also possible you have a bad connection between the line hot feed to the relay socket.
Are you checking the connections not just continuity? The only thing left is what I mentioned in my last post.
You could have a bad connection between the line hot feed to the relay socket.
I got nothing else. Based on what you're telling me it should work.
I don't understand your question. You won't get 120 v to the pump if you don't have 120 v to the relay
Like I said before it should work based on what you're telling me
The thermostat trips the relay. Since the thermostat is low voltage a relay is required to make the 120 volt connection. Your thermostat is turning the burner so that connection is good