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I have a pretty old furnace, but it is working fine. After…

I have a pretty...

I have a pretty old furnace, but it is working fine. After installing a 3rd generation Nest thermostat, it is indicating I have no power to the rh wire (e24 error). After replacing the 3 fuses I could find on the furnace, still no luck. So after taking the Nest off and putting the old thermostat back on, it functions perfectly. That indicated that it isn't a fuse correct? Also, any idea on what may be going on here? Thanks!

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

Thermostat most likely

Contractor's Assistant: Do you plan on doing the work yourself?

Yes

Contractor's Assistant: Anything else we should know to help you best?

Furnace is at least 25 years old but maintained well and working great

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Answered in 26 minutes by:
3/6/2018
Bill
Bill, HVAC Technician
Category: HVAC
Satisfied Customers: 111
Experience: Service Mgr
Verified

Hello, and I am very sorry for the delay. The test you did confirmed the furnace has power.

The only other options are:

The Nest is defective

The furnace was off on "limit" when you were trying the Nest and cooled and recovered when you put the old back on.

Remove old when you know it has just worked and try the Nest again. If it still says same code you will need to replace the Nest.

If any questions please let me know and I will follow through with you

Bill
Bill, HVAC Technician
Category: HVAC
Satisfied Customers: 111
Experience: Service Mgr
Verified
Bill and 87 other HVAC Specialists are ready to help you
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Customer reply replied 4 months ago
Great, thanks! I'll be able to check it in a few days. I actually have another Nest from a different house I can check with.
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