dometic ac shutting down at night
my dometic a/c runs fine during the day but shuts down at night. i can get it going again by turning the thermostat off then back on. it will run for several minutes then shut down again. i've noticed...
Forum Discussion
DFord wrote:
The indoor coil is protected by a "freezestat" to keep it from frosting/icing over and stopping all the passage of air from the blower. When you turn the a/c off and back on that safety feature is reset until the next time it frosts up. Running the fan on continuously allows the frost to melt when the thermostat cycles the compressor. Make sure the air filter and the face of the indoor coil is clean. The coil has a habit of matting over when dirt and dust get past the cheap filters used in RVs. You'll need to take the plastic cover off the inside and look up there with a flashlight to see the face of the indoor coil.
1. The freeze Thermister is not a safety item
2. Once the Freeze Thermister trips from freezing, the ONLY thing that resets it is for the Coil to warm up. Turning the power OFF or resetting the Tstat will not bypass a Freeze Thermister that has tripped from freezing.
3. Running the Fan continuously(on HI) just keeps the Evap coil from freezing. If you run it on LO cool or AUTO, it may freeze. On Auto, the fan runs on HI then goes to LO as it nears the preset temp and THAT fan speed change can cause a freeze up if the Freeze Thermister is inoperative.
4. IF you have a wall tstat, the Evap CANNOT freeze regardless of Fan setting or on Auto. Wall Tstat AC systems have the Freeze Thermister. So, IF your unit freezes up, either the Freeze Thermister is defective(very rare) or the Thermister is not installed in the evap or in the wrong place in the Evap. Doug
