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My Original Question: My furnace flame goes out at times. Sometimes it won't light, other times it lights and quits after a few seconds or almost a minute. Then it might run for many minutes. One time I got a steady LED indicator light, controller needs replacement. Then it works again.

I have the White Rogers 50A50-471 controller. I can take the -473 controller out of a spare similar, but smaller, furnace. Are they directly interchangeable?

Also, I tried measuring the DC voltage out of the step down transformer but I can't get the meter to indicate any voltage. A quick tap across the terminals (with output leads removed) produced a spark. If I pull off an output lead while the furnace is running it immediately shuts down, so it must be supplying voltage.

Sorry for long question, cold in MN! Thanks!


Your Response: Make and model of the furnace will help. Your low voltage control circuit should be 24v ac not dc but yet I don't know what you have.


My Answer: Helping already! Yes, AC voltage, and it reads 24 volts correctly, silly me.

I have a Trane TUD100C936HO, 100,000 BTU input, house furnace. It's now been running for over 15 minutes this time, and continuing to run. Buy the way thanks so much.

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