The thermostat still works. What happened is during the past couple of years, there has been something black inside the display growing from top gradually to the bottom. When the display light is on, this black thing covers the readings. Is this mold? Is there a way to fix? If not, can you recommend a similar thermostat that can replace this one? This model is no longer available and there are too many new thermostats on the market, I don't know which one is compatible with my system. Thank you very much!
It's probably the liquid crystal has a crack and is flowing inside the glass. It can only be repaired with a new display.
Why not contact Totaline directly and see what they can offer?
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