What to do with Y wire?

[SundanceCo]

Installing thermostat for my heat only, no AC system. What do I do with the Y wire, since I don’t have air conditioning? I tried connecting it to the Y connector, and I also tried leaving it unattached. In both cases, the furnace starts up, but then shuts off after a few minutes.   Thank you in advance for your help.

[SundanceCo]

Update: I taped off wire Y, leaving it unconnected. Thermostat works for a while, a half hour or more, heating the house nicely. But then the furnace turns off before reaching target temperature, and then it tries to come back on. It sounds like it is trying to turn back on, over and over. Any ideas on what’s wrong? 

[Jake]

Hey there,

Sorry to hear about the trouble. I wanted to follow up and see if I could be of any help. I found an article that has some troubleshooting steps. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Markjosephp]

Hello SundanceCo,

I'm checking back in. Were you able to do the steps from the link shared by Jake? I'd be glad to hear from you — I'd like to make sure everything is working.

Best regards,

Mark

[Jhonleanmel]

Hi everyone,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

Thanks,
Mel