11-13-2023 05:51 PM - edited 11-13-2023 05:53 PM
We just got a nest about three weeks ago and I’m having trouble understanding the behavior. I’m particularly sensitive to potential issues because we just had to replace the furnace blower.
The nest will kick on the furnace and it will run for however long to get to temp. About two minutes after it shuts off, the furnace seems to kick on again, run for about a minute, then goes right back off. No activity shows in the Home app for this short cycle and it seems to do this every time after the furnace runs.
I thought it might be the filters being too restrictive, but the furnace ran for 20min this morning without being tripped for overheating. The short cycle also only happens once or twice before it remains idle and this wasn’t an issue with our old thermostat. It seems like it shouldn’t be the thermostat activating the furnace since it doesn’t show in the activity log, but I’m not sure what else it would be.
Any ideas?
11-16-2023 04:04 PM
Hello Nesthelp987,
I understand that you're having trouble with your Nest thermostat controlling your furnace. Let me help you out. Just to check: what type of Nest thermostat are you using? What are the labels on the wires connected to your Nest thermostat? If you are using a Nest thermostat E or 3rd Generation Nest thermostat, could you please share the power reading? Here is the link on how to get the power reading on your thermostat: Nest thermostat information menu.
I look forward to your response.
Best,
Edmond
11-17-2023 03:25 AM
Hi Edmond,
Thanks for the response. I have the regular nest thermostat. The power reading is showing at 3.08, which seems low according to Google’s explanation. All of the tabs on the wires are down, but not equally. The yellow wire’s tab sits a little higher than the others. Could this have an effect?
We have the common wire hooked up. The wires themselves don’t have labels, so I’m not sure how to answer that question.
Thanks for your help!
11-19-2023 02:18 PM
Hi there,
@Nesthelp987, thanks for providing the information above. The power readout for Nest Thermostats should be at least 3.7 V above. You can check the labels of the wires beside your thermostat's connectors. Please provide the color of each wire and where they are inserted.
You must see the labels like Y1, Y2, C, W1, W2 Aux, G, *OB, *, RC, or RH if you have the Nest Learning Thermostat. If you have the Nest Thermostat E, the labels are Y1, W1, G, C, R, and *OB.
Also, try removing your C wire, and check if the issue persists. Ensure to turn the breaker off before touching the wires.
I appreciate the input, Edmond.
Regards,
Jenelyn
11-20-2023 02:38 PM
Hi Jenelyn,
Confirming that we have the Nest Thermostat E with the setup you mentioned. I tried removing the C wire and the google home app gave a message that it needs to be connected to work. The voltage reading on the device also went down to 2.96. I’m going to reattach it for now, but any other suggestions?
11-24-2023 02:33 PM - edited 11-24-2023 02:34 PM
Hi folks,
@Nesthelp987, thanks for trying, and I'm sorry for the delayed response. If your furnace is short cycling, check your air filter, as a clogged filter might cause a similar symptom. If the air filter is dirty and needs to be changed, replace the air filter and let us know if the issue continues after you change the filter. Refer to the Air filters and filter reminders article for more details.
I appreciate your help, Edmond and Jenelyn.
Kind regards,
Zoe