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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22541
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have a 8035C and the thermostat is locked. I have tried to

Customer Question

I have a 8035C and the thermostat is locked. I have tried to unlock it on the Menu screen but it does nothing. How can I unlock it?
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: the thermostat
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: no
Submitted: 9 months ago.
Category: HVAC
Expert:  BillyHvac replied 9 months ago.

did you hold the lock icon for a full 5 seconds?

Customer: replied 8 months ago.
I did
Expert:  BillyHvac replied 8 months ago.

does the lock show open or closed?

Customer: replied 8 months ago.
it shows closed. I have also replaced the batteries and that did not help.
Expert:  BillyHvac replied 8 months ago.

i really wish there was a more technical answer. But in this economy series there are few options and not a great lifespan.

If the lock does not open with a 5 second hold then the lock is defective rendering the thermostat unusable.

The good news is this thermostat runs only $25-$30.

I apologize but there is no remedy if the 5 second hold fails

Customer: replied 8 months ago.
thank you
Expert:  BillyHvac replied 8 months ago.

you are welcome and I wish you the best