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I have to leave for about an hour but in the mean time try putting the new relay back then jump the R & G terminals (should be where thermostat leads are connected) on the transformer and tell me if the burner fires up. I'm assuming your unit has a standing pilot (lit all the time). I'll respond when I get back.
Just connect the R & G terminals with a small piece of wire. Best to turn the power off first then make your connection then turn the power back on. I'll get back to in in about an hour
That's not what I said. I said to connect the R & G TERMINALS on the transformer next to the relay. I didn't say anything about connecting wires (at least not yet). Give that a try and let me know what happens
It looks like it may be difficult to jump the terminals since your transformer has all spade connections.
So the alternative would be to connect the 2 wires the thermostat leads connect to. Looks like you have thermostat wire with a white outer cover and they used the typical red & white wires to the thermostat. So remove the blue wire nuts then twist those wires together. Looks like red & white connect to 2 black wires (which is typical). The tag identifying the thermostat connection looks like it may still be attached to the black wires. The point here is to twist the 2 blacks together
Power off first then back on once you make the connection
You can turn of the power to the boiler either at the breaker or the service switch near,on the side of the boiler
Is the vent damper open?
Ok, put the old relay back and tell me if the burner fires up
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Ok, so I just wanted to be sure you had the right relay. If it fired up with the old relay then the new one would have suspect. So I assume the thermostat wires are still connected together. Next check the blocked vent switch. Turn the power off and put the new relay back. Then press the button between the 2 wires on the blocked vent switch. It's attached to the draft diveter (see attached pic). If you push the button and it clicks you have reset t and the unit will fire up with any luck when you turn the power back on
Then it wasn't tripped. There are 2 more devices in that circuit hat you need to jump out/bypass by connecting the wires together. One is the limit. The device with the dial where you set the boiler temp. The other is the rollout sensor (see attached) which is just outside of the where the burners are. If you jump both of these and nothing happens then you need a multi-meter for the next step. jump these devices 1 at a time. I'm assuming the black thermostat wires are still connected together.
Ok, you got the 2 devices. The limit you can connect the 2 terminals with a piece of wire and leave the leads attached. The rollout sensor you'll have to take the leads off and use a paper clip or piece of wire in the connectors. They should have an open round section on each side of the connector that you can jamb a wire into. It needs to be a pretty tight fit