I have this model thermostat not sure if it's the uhc- or the rhc- or what the difference is between those two. My problem i've had since it was installed with new Rheem heat pump in 2007 is the display is very hard to read. It wakes up and turns blue but is very dim. The installers replaced it once but that didn't help much. Even at night with no lights on it is still hard to read. Like the contrast is off. Are there any adjustments a firmware fix?