Nest E thermostat

[Mjflaherty]

I bought the Nest E thermostat because I saw many places it could work with out a common ( C wire). I have a two-wire heat only system on an ancient furnace there is no common on the furnace. I installed the Nest E using the R and W1 terminals. It turns the furnace on but the furnace makes strange sounds but runs and sends heat but it won't shut off when at temp.

[ByronP]

Hi Mjflaherty,

Thank you for reaching out to the community. I apologize that you're having trouble turning on the heating with your Nest Thermostat E, and that your furnace is making strange sounds and is unable to turn the heating off. I understand how frustrating this can be. Let's work together to find a solution.

Before I begin, I need to ask a few questions for further assistance:

• When did the issue start?

• What other strange symptoms have you experienced since the problem started?

• Are there any error messages? If so, what are they exactly?

• Have you checked your Heating, Ventilation, and Air Conditioning (HVAC) system's compatibility with your Nest thermostat through the Compatibility Checker tool?

• Do you notice any intervals or specific patterns between these strange behaviors?

• When was the last maintenance check for your HVAC system?

• Have there been any recent changes or upgrades to your HVAC system?

• Have you experienced any power outages within the last few days or weeks?

Please keep me posted. I'll look forward to your response.

Regards,

Byron