Why is my Advent Thermostat Just a Blinking Screen with No Letter or Numbers?
Updated 10/27/2025 | Published 03/10/2025
Question:
this is keith at uncharted adventures im having a problem with your thermostat control i have wired it in and now the screen just blinks no letters numbers etc im thinking a faulty thermostat control? if you could respond with your thoughts id much appreciate it thank you..
asked by: Keith
Expert Reply:
Hey there Keith,
I am sorry the thermostat on the Air Distribution Box w/ Wall-Mounted Thermostat for Advent Air RV Air Conditioners # ACRG15 is not working correctly. It sounds like a frustrating issue, but let's go through a few things to see if we can get it sorted out. If the screen is blinking but not displaying any numbers or letters, the first thing to check is the power supply. Make sure the thermostat is getting a steady 12V DC, as low or unstable voltage can cause issues like this. You can use a multimeter to confirm if the right amount of power is reaching the thermostat.
Next, it’s worth double checking the wiring to make sure everything is connected properly. A loose or incorrect connection could be causing the issue. The standard wiring for these thermostats typically has red for power, blue for common/ground, yellow for the compressor, white for heat, and green for the fan. If all the connections look good, try resetting the thermostat by disconnecting power for about 10–15 minutes before reconnecting. Sometimes, a reset is all it takes to clear up the problem.
If you are still having some issues I recommend that you reach out to my friends at Advent (they are a great team): 800-688-3135
Please let me know how things work out and how you got it working =)
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Kate F.
10/27/2025
Hey Keith, were you able to get the thermostat on your Advent Air system working after checking the power and wiring? Knowing what fixed the blinking screen could help others with the same issue. Your update could point others in the right direction.