Empyre 450 Issue

[Lostboy9]

I have a Empyre 450 wood boiler. Upon start up I am getting a fault on the Aquastat

I have checked the thermocouples with a multi meter and get 975 ohms at approx 70 degrees F. From what I have read it should be OK. Checked the high temp disk and it shows continuity.
Upon start up it comes up with the code then the temp of the boiler. There is a clicking sound in the aquastat but the solenoid and blower never try to start. I have tried to look up the issue and found the attached description which is exactly what I am experiencing.

Is it possible the thermocouples is faulty causing this issue or is it another component.
Thanks for the help

 

[stoveliker]

While I have no boiler experience, one does not check the working of a thermocouple with an ohm meter measuring resistance.
The resistance of a thermocouple junction as measured on the ends of the wires depends a lot on the length of the wire, more than on the junction itself. (most TC wire is rather high resistance b/c it's thin and it's odd alloys).
Only if the ohm meter says open circuit, then you know it's broken.
Otherwise you should be measuring the voltage on the leads and compare that to the table of voltages it should be putting out at a known given temperature. This is in the milliVolt range.

 

[Lostboy9]

While I have no boiler experience, one does not check the working of a thermocouple with an ohm meter measuring resistance.
The resistance of a thermocouple junction as measured on the ends of the wires depends a lot on the length of the wire, more than on the junction itself. (most TC wire is rather high resistance b/c it's thin and it's odd alloys).
Only if the ohm meter says open circuit, then you know it's broken.
Otherwise you should be measuring the voltage on the leads and compare that to the table of voltages it should be putting out at a known given temperature. This is in the milliVolt range.

Thanks for the suggestion. Don’t know a lot about electricity so was just going by what Google suggested.