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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5788
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Why does my thermostat change temparature settings daily? I

Customer Question

Why does my thermostat change temparature settings daily? I set my house temparature on 73 and it changes by itself every day. If I don't watch it, it goes down to 57.
Submitted: 2 years ago.
Category: HVAC
Expert:  Phil replied 2 years ago.

Phil :

All work to be done by licensed professional. WE KEEP GOING UNTIL YOU HAVE THE INFORMATION YOU NEED, I come and go. This is step ONE.

Phil :

Hello

Phil :

You may have programmed it for 57...and it is simply reverting to that programming after you manually adjust it 73.

Phil :

Its either that, or the thermostat is going bad.

Phil :

I would try reprogamming the thermostat from scratch.... let me know how that goes..

Customer :

How do I program it? I have my grandkids and I'm constantly having to watch the thermostat.

Phil :

describe what you see on the face of the thermostat. all the levers and buttons.. and if it has a display screen on it, or just levers you can set.

Phil :

Next i will need the model number of the thermostat, that should be behind the front cover

Phil :

we can go from there. Phil

Customer :

ok, it's a honeywell, with a temperature display, it has up an down buttons on the right, on the left hand side there are buttons that say, Fan, auto and on. On the right under System it says Cool, Off and Heat. On the temparature display is says Set on the left side and Room on the right side

Customer :

Do I just take the back off to get the serial number? The top part comes off but the bottom part seems like I might have to snatch it off. Will I break it if I do this?

Customer :

Come back Phil.....

Phil :

Hello again

Phil :

Use the up and down buttons to the desired temperature, 73F in this case.. then press and hold the set button for 10 seconds.

Phil :

lets see if that holds for now.

Phil :

The serial number is not needed... but the model number is needed.

Phil :

that should be behind the front cover that generally just pops off... but do look for any tiny screws on the sides of the thermostat that may be holding the cover in place first.

Customer :

ok, hold on please

Customer :

T8400C 1024 (2) below these numbers are 0312 2A

Phil :

Thanks

Phil :

I will look it up

Customer :

Oh, no when I put the unit back on the wall it turned off. No readout, it's a blank screen

Phil :

Hello again, its not programmable

Customer :

what do I need to do

Phil :

Look this manual over for how it operates..

Phil :

http://customer.honeywell.com/techlit/pdf/PackedLit/69-1480.pdf

Phil :

we can discuss it from there

Customer :

thanks so much

Phil :

I must come and go on this end, just post when you can, and I am notified and pick it up when I can.

Phil :

Phil

Customer :

Thanks Phil, I need someone to come to the house, cause I don't know anything about this. Thanks so much for your help.

Expert:  Phil replied 2 years ago.
You are welcome

Phil

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Phil
Phil
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Retired HVAC/ Electrical & Boiler contractor. Industrial