I have a Honeywell theromostat chronotherm IV plus, the greenish light
went out on it. I've checked the batteries, they are OK. The rest of
the thermostat seems to be working OK.
<< the greenish light went out on it. >>
That's an LED and given the 100,000 hour life span of the usual LED then the
circuitry to it has given up, i.e., the circuit board likely has a fault. This
being the case, it may be wise to replace the unit before something else gives
up. Just for the heck of it why not call Honeywell customer service to learn if
there may be a warranty on the thermostat? HTH
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