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Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 19123
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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how do i correctly test a thermocouple

Customer Question

how do i correctly test a thermocouple
Submitted: 7 years ago.
Category: HVAC
Expert:  Rick replied 7 years ago.
Hi ChristophBro, <br /> <br />There is one other method if you have a multimeter that will read milivolts. While holding down the pilot button on the gas valve so the pilot will stay lit (and the thermocouple still installed) attach one lead to the copper wire on the thermocouple ( I use a jumper with alligator clips at each end) then your positive lead to the tip of the thermocouple that attaches to the gas valve. It should read at least 10 mv. The reading may fluctuate since your connections aren't solid and you're only reading millivolts.