[chev]

I have an old Bryant that has very few safety switches it has a continious burn pilot. My problem is the burner will not light. I have cleaned burners, replaced thermostat. I can get the fan to run with the "Fan on" selection of the thermostat. I check the voltage at the gas vavle, from the limit switch and get none I also check voltage supplying limit switch and still none.

[wmproop]

Have you checked the voltage coming from transformer,, should be 120 volts going in and 24 volts coming out other side,, if not,24 volts coming out,, just might need replacing

[chev]

Thanks for the help but ended up being the upper limit switch just needed reseting

[labman]

If your transformer doesn't have a fuse for it, I would add one. I think there are pictures of them in the sticky at https://www.askmehelpdesk.com/heatin...ons-58313.html

Adding a fuse is a cheap, easy project and saves replacing the transformer if anything goes wrong.