Tony Hwang wrote:
RLM wrote:
On Tue, 06 Jan 2009 08:49:36 -0500, mcp6453 wrote:

The programmable thermostat on my upstairs Comfortmaker heat pump has
started acting strangely. It's made by Totaline. In normal operation,
when it is being programmed, certain numbers or digits (temperature,
heat, cool) will flash to indicate which parameter is being set.
After a few seconds, the flashing stops to indicate that the control
is no longer in the programming mode. The problem with my unit is
that it sometimes continues to flash.

I've removed and restored power to the thermostat and to the heat
pump to try to reset the unit. Neither has helped. My guess is that
the unit is defective. (I cannot find a reset button.) The biggest
problem is that when a time-of-day setting is activated, such as
changing the heat from 69 to 72 degrees at 6:00AM, the heat does not
kick in.

I cannot find a model number anywhere on the unit. It looks almost
exactly like the "Gold Programmable" on page 4 of the Totaline
brochure at http://www.totaline.com/dl/570-484.pdf, meaning that it
may be a Model P274. How can I find out which unit is the correct
replacement? I want to replace it myself. The heating and cooling
stages don't mean a lot to me. The heat side has emergency heat and
normal heat (is that two stages?) As far as I know, the cooling is
only one cycle. Am I going to have to get the model number of the
heat pump to get the specs, or is there another way to characterize
the unit?

Have you removed the cover of the thermostat and replaced the battery. My
Dad called me once and was ready to replace his heat pump because of one
of these digital thermostats had a battery inside. He replaced the
battery
and all was well. He didn't know that a battery run the memory.
Just a thought.
Hi,
When batteries need replacement it'll give plenty of warning displaying
flashing letters "Batt" Programmed setting is stored in the NV memory
and dead batteries won't erase it. You can either set it to dactory
defaulr setting or reprogram it any way you want. Some one mentioned Day
light saving time change. Mine has a button wich moves clock one hour
back and forth.




Mine doesn't use a battery -- it has a large capacitor to bridge power
interruptions.