Will not regulate humidity correctly. I set it at 60% and it is still running when the humidity in room reads 45%. I have confirmed this with a separate humidity gauge.

There could be several reasons why the humidity reading on the digital control is not accurate. Here are a few things you can try:

1. Calibrate the hygrometer: The first thing to do is to make sure that the hygrometer you are using to measure the humidity is calibrated correctly. You can check this by placing the hygrometer in a sealed container along with a wet sponge or cloth for a few hours. The hygrometer should read close to 100% humidity. If it doesn't, then it may need to be calibrated.
2. Check the humidity sensor: The humidity sensor in the incubator may be faulty or dirty. You can clean the sensor with a soft cloth or replace it if it is damaged.
3. Check the water level: Make sure that the water level in the incubator is sufficient. If the water level is low, the humidity will be low as well.
4. Check the ventilation: The ventilation in the incubator should be set to allow for proper air exchange. If the ventilation is not set correctly, it can affect the humidity level.
5. Check the room conditions: The room conditions, including temperature and humidity, can affect the humidity level in the incubator. If the room is too dry, it can affect the humidity level in the incubator. You may need to adjust the dehumidifier or add a humidifier to the room to maintain the proper humidity level.

could you be mistaking the room humidity indicator for the time? reason I ask is on these one display units this happens more frequently than Id care it too , the one display shows both time and room humidity also set point humidity , the only way one can tell is on some models there is a tiny light that shows up next to labeled function , easy to miss It , also if your machine is sort of new (last few years) it has been decided that it's more efficient to let the circulation fan run all the time , regardless of room humidity . this makes it a little annoying (noise) but they do cycle the compressor to regulate the room humidity

Is it reading the room humidity, rather than showing the set point? Check the manual.

The 45% setting is too low and the setting is never satisfied, so the unit keeps running to try and reach 45%. Try setting to 50 or 55, this is a very comfortable range. I was not clear on the room temperature being at 55 degrees. Is this what your thermostat is set to or is this the actual room temperature. Brrrrrrrrrrrr

If the humidity level is at or lower than 30%, the unit won't turn ON, until the reaches 35 - 40%. It's rare for the sensors to go bad. Just keep in mind, the dehumidifier is reading the humidity near the floor, not up at say, chest level. Humidity levels change every season, so this really would not be that unusual. Make sure that your clean the air intake filter regularly. Cleaning and wiping down the coolant coils would be a good idea, too..

Hope this helped you. Please let me know.

THE LOWER THE % SETTING, THE MORE MOISTURE THE DEHUMIDIFIER WILL REMOVE!!!
I have a Provic dehumidifier mainly to remove damp from walls in my 1900s terraced house ( 3rd DPC failed, another on its way). I've read a lot about the technical side and all I wanted to know was 'do i set it on the highest or lowest % to extract moisture from the walls'. I rang the Managing Director at Provic (his contact details are given on their website) who was very helpful. He advised that the lower the setting, the more damp would be removed from the walls and therefore the air, as the water passes from the wall into the air. My DH ranges from 40% to 70% so he advised me to set it at 40% in the worst affected room to remove as much moisture as possible from the walls. As the moisture is removed, the DH will collect less water and set itself to the correct level anyway. He advised me that when as much water as possible has been removed from this room and the DH % will not drop any lower, to move it to a more central position in the house, such as the hallway to then start setting the rest of the house to the correct humidity level. I set the DH to 40% and left it on overnight closing all doors to the affected room and removing containers of water such as a vase of flowers. When I got up in the morning it had switched itself off as it had already collected 3 litres of water! You do have to be careful not to over dry the air as everything, furniture and electricals, naturally needs moisture, but for a short term, quick drying solution, this level is ok.
Hope this helps!

coolant may be low - warranty should be 5 years

If the room temperature is close to 60, the coils may be frozen (completely encased in ice). If this is the case, move it where the water can drain off - about 1 gallon which may NOT run into the drain bucket.
I out mine over the floor drain.
Turn off and it will defrost over night.
Only specially made dehumidifiers work below a room temp of 60 degrees (the temp of a basement in winter).
Does it need to be running? A digital humidity sensor from Radio Shack is cheap and may tell you the humidity is OK - only 50% or less.

If the room temperature is close to 60, the coils may be frozen (completely encased in ice). If this is the case, move it where the water can drain off - about 1 gallon which may NOT run into the drain bucket.
I out mine over the floor drain.
Turn off and it will defrost over night.
Only specially made dehumidifiers work below a room temp of 60 degrees (the temp of a basement in winter).
Does it need to be running? A digital humidity sensor from Radio Shack is cheap and may tell you the humidity is OK - only 50% or less.

I have the delonghi DEN500P and the unit runs but does not condense any moisture? The appropriate buttons have been set to bring the unit humidity setting well below humidity in room

low on freon is the compressor running?