what does ! mean on screen of programmable filtrete thermostat?

A non-programmable thermostat means that you set the temperature, and it doesn't have an automatic night or weekend setting. If you want it cooler at night, you have to set it in the evening. If you want it warm in the morning, you set the thermostat warmer when you get up.

In British usage, a tanner was a sixpence, and a bob was a shilling.

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does not have a trusted certificate and you might download a virus or a hacker.if you know this website to be trusted go for it and if you have an active spyware and anti virus program it will warn you before you do anything.hope this helps you

This is a mystery. I will think on it and get back to you if I can find some plausible explanation, or other experiment.

'Filtrete' ads are vague about what it removes. Fluoride is probably not filtered. Mainstream companies don't want to anger the feds by publicly implying fluoride's bad. Some will reveal an add-on fluoride filter if asked, but stock fluoride filters are mostly the domain of alternative companies.