Jeff Wisnia writes:

One of the GE Weathertron Model 3AAT80B1A1 thermostats in our home is
doing its thing and when the temperature setting is increased a few
degrees above ambient the auxillary heaters come on OK to supplement
the heat pump's output.

The blue "Aux Heat" indicator recently stopped lighting in that
mode. I could live with it that way, but being an engineer I'm sort of
anal about having everything working the way it was designed to.

Does anyone happen to know the type number or the voltage/current
ratings of the "grain of wheat" incandescent indicator bulbs used in
those thermostats. (It's soldered in.)

It would be annoying to spend good money to replace an otherwise
working thermostat just for the want of a bulb.

I suppose I could measure the voltage and current draw of the working
bulb in our other identical thermostat, but I thought I'd ask here
first.

As an engieer, doing the measurement will be unavoidable.

--
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