Honeywell Thermostat issue

Posted by jkdrummer on December 5, 2008, 1:12 am

Installed a new Model RTH7600 Honey Programmable Thermostat. The temp
in the house was around 63F based on my trusty alcohol thermometer.
But my $99 RTH7600 read a temp of 72F. Waited for 20 minutes and now
it read 68F. Furnace finally kicked in (I had it set at 68F) the
RTH7600 still read 68F. Ran for 15-20 minutes.

My questions:

1. Does this thermostat need time to get an accurate indoor temp
reading?
2. Is there a way to calibrate the indoor temp? Or reset the entire
thing?
3. Should I return it?

Thanks
Jk

Posted by Bubba on December 5, 2008, 7:36 am

On Thu, 4 Dec 2008 22:12:14 -0800 (PST), jkdrummer

>Installed a new Model RTH7600 Honey Programmable Thermostat. The temp
>in the house was around 63F based on my trusty alcohol thermometer.
>But my $99 RTH7600 read a temp of 72F. Waited for 20 minutes and now
>it read 68F. Furnace finally kicked in (I had it set at 68F) the
>RTH7600 still read 68F. Ran for 15-20 minutes.
>My questions:
>1. Does this thermostat need time to get an accurate indoor temp
>reading?
>2. Is there a way to calibrate the indoor temp? Or reset the entire
>thing?
>3. Should I return it?
>Thanks
>Jk

Yes. Its almost always the thermostat. Get another. Get two or three
while you are at it. One of them will surely work.
Dont forget to change out the low voltage wiring from the thermostat
to the furnace. The old wire will retain a "memory effect" and block
the new thermostat signal for calibration of the new thermostat.
Bubba

Posted by Steve on December 5, 2008, 8:28 am

> Installed a new Model RTH7600 Honey Programmable Thermostat. The temp
> in the house was around 63F based on my trusty alcohol thermometer.
> But my $99 RTH7600 read a temp of 72F. Waited for 20 minutes and now
> it read 68F. Furnace finally kicked in (I had it set at 68F) the
> RTH7600 still read 68F. Ran for 15-20 minutes.
> My questions:
> 1. Does this thermostat need time to get an accurate indoor temp
> reading?
> 2. Is there a way to calibrate the indoor temp? Or reset the entire
> thing?
> 3. Should I return it?

go back to the big box store and see if you can buy a clue

Posted by on December 5, 2008, 10:04 am

> 1. Does this thermostat need time to get an accurate indoor temp
> reading?
> 2. Is there a way to calibrate the indoor temp? =A0Or reset the entire
> thing?
> 3. Should I return it?
> Thanks
> Jk

1. Yes

2. Yes

3. Probably not.

Dan

All temperature measuring devices need time to cool or heat up to the
ambient temperature. Some take seconds, others much longer. There is
no reason a thermostat needs to rapidly read the temperature. The
house changes temperature slowly.

Posted by jkdrummer on December 5, 2008, 11:02 am

On Dec 5, 7:04=A0am, dcas...@krl.org wrote:

> > 1. Does this thermostat need time to get an accurate indoor temp
> > reading?
> > 2. Is there a way to calibrate the indoor temp? =A0Or reset the entire
> > thing?
> > 3. Should I return it?
> > Thanks
> > Jk

> 1. =A0Yes
> 2. =A0Yes
> 3. =A0Probably not.
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Dan
> All temperature measuring devices need time to cool or heat up to the
> ambient temperature. =A0Some take seconds, others much longer. =A0There i=

> no reason a thermostat needs to rapidly read the temperature. =A0The
> house changes temperature slowly.

I think you're right Dan. I checked it this morning and it's closer
to the alcohol thermometer now. Thanks for the reply.

JaKe

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