I have a carrier programmable thermostat that is approx 3 years old.
The thermostat works fine, but the clock is not keeping time correctly
(losing about 15 minutes a day). There hasn't been any power outages
as none of my other clocks are affected.
I thought there might be a battery somewhere, but I took it off the
wall and don't see one (I believe it is powered by AC). Does anyone
know if there is a battery somewhere or does it probably need to be
Probably the clock circuit itself is controlled by a quartz oscillator,
so it should be quite accurate.
But perhaps its power supply is marginal. If so, it might be easily
repairable (e.g. new diodes or capacitors).
Or perhaps the AC supply itself is marginal. Is there any chance of a
loose connection anywhere in the system?
Beyond that, it sounds like a replacement might be necessary.
Any chance it's still under warranty? This kind of stuff should last
longer than 3 years.
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Some digital thermostats can be removed from the wall without making the
batteries visible - they remain within the unit you're holding in your hand.
You might need to open a faceplate or something. Where is your instruction
manual? Or, go to www.carrier.com and call them with the model number handy.
Never heard of a programmable thermostat that
doesn't have a battery. Normally they are powered
by AC but the battery is to remember the program
when the AC power goes off. A low battery could
affect the clock.
A low battery can affect the clock by stopping it or having it reset to
12AM. But the clock keeps time via a crystal oscillator that is
voltage independent. Otherwise, all digital clocks would lose time as
the battery decays, but they don't.
Sounds like this is a defective thermostat
On 12 Oct 2006 08:18:09 -0700, firstname.lastname@example.org wrote:
Repair questoins might be posted at sci.electronics.repair , but if it
turns out that it is broken, that is, a new battery doesn't help, I
think Carrier might give you a new one whether the guarantee is still
in effect or not. I have no experience with this, but this is the not
the kind of problem caused by abuse, or damage, or your kids, but
something inside went bad not because of any of that.
How long has it been broken?
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