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Honeywell Chronotherm III - AC

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Honeywell Chronotherm III - AC alex4misc2 04-22-2008
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Posted by alex4misc2 on April 22, 2008, 4:25 am
Hi there

My Honeywell Chronotherm III shows "- AC" and blinking "TEMPORARY". Any
ideas why and what can be done to fix it?

I changed the batteries - it did not help.

Thank you in advance, Alex.
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Posted by Dr. Hardcrab on April 22, 2008, 5:37 pm

> Hi there
>
> My Honeywell Chronotherm III shows "- AC" and blinking "TEMPORARY". Any
> ideas why and what can be done to fix it?
>
> I changed the batteries - it did not help.
>
> Thank you in advance, Alex.

AC means there is no power to the thermostat. It could be that the circuit
breaker is off or tripped, or your low voltage transformer (to your air
handler, furnace, or whatever you have) is bad. Does the fan come on when
you switch the fan switch from 'auto' to 'on'? If not, you have a power
problem (in other words, the 'AC' does not stand for Air Conditioning).

The flashing 'temp' means that you have adjusted the temperature away from
whatever you have programmed.


Posted by Bubba on April 22, 2008, 9:23 pm
On 22 Apr 2008 08:25:34 GMT, alex4misc2_at_gmail_dot_com@foo.com
(alex4misc2) wrote:

>Hi there
>
>My Honeywell Chronotherm III shows "- AC" and blinking "TEMPORARY". Any
>ideas why and what can be done to fix it?
>
>I changed the batteries - it did not help.
>
>Thank you in advance, Alex.
>-------------------------------------
>
>
>
>
>##-----------------------------------------------##
>Delivered via http://www.thestuccocompany.com/
>Building Construction and Maintenance Forum
>Web and RSS access to your favorite newsgroup -
>alt.hvac - 25866 messages and counting!
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Alex,
I am somewhat of an expert on thermostats. If it is flashing "- AC" it
is quite a simple fix. It just means the Air Cond will not work.
Usually you just have to put in fresh batteries.
If it is flashing "TEMPORARY" it just means that .....temporarily, the
A/C will not work.
Both messages are really working together. You often have to replace
the thermostat if both messages are showing.
Bubba

Posted by on April 23, 2008, 12:09 am
On 22 Apr 2008 08:25:34 GMT, alex4misc2_at_gmail_dot_com@foo.com
(alex4misc2) wrote:

>Hi there
>
>My Honeywell Chronotherm III shows "- AC" and blinking "TEMPORARY". Any
>ideas why and what can be done to fix it?
>
>I changed the batteries - it did not help.
>

Go to your local big box store and buy a can of electronspray.
Carefully remove the stat and spray the red an blue wires.

Posted by big_dgreen on April 25, 2008, 3:30 pm
big_dgreen had written this in response to
http://www.www.thestuccocompany.com/hvac/Honeywell-Chronotherm-III-AC-31748-.htm
:
Temporary flash typically means you have a programmable t-stat and your
overriding the temperature and it will reset itself back to program after
about 2 hours.

AC could be a diagnostic code from the air handler to the t-stat to alert
you of a problemm.

I agree with the info about possibly losing low voltage from your
transformer. If the ac is not running you should call a service man.

If it is running, it may be a filter reminder, but I doubt it. I'm not
familiar with the chronotherms layout.

-------------------------------------
alex4misc2 wrote:


> Hi there

> My Honeywell Chronotherm III shows "- AC" and blinking
> "TEMPORARY". Any
> ideas why and what can be done to fix it?

> I changed the batteries - it did not help.

> Thank you in advance, Alex.
> -------------------------------------




> ##-----------------------------------------------##
> Delivered via
> http://www.thestuccocompany.com/
> Building Construction and Maintenance Forum
> Web
> and RSS access to your favorite newsgroup -
> alt.hvac - 25866 messages and
> counting!
> ##-----------------------------------------------##





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