DIYbanter - View Single Post - Carrier Thermostat Clock not keeping time

CJT

wrote:

CJT wrote:

When you took it off the wall, did the clock stop completely? If not,
then (assuming it was off the wall long enough for any energy storing
capacitors to drain) it must have a battery.

Yes, the entire LCD went blank.

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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