E4 is an internal frost protection. Make sure your filter is clean and the unit is pulling and pushing good air. Unplug system and allow coil to thaw.
If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79
Testimonial: "took the cover off of it no frost. filter is clean. its blowing good air, just not cold"
SOURCE: E4 Error Message
ok sir! are you sure is the sensor are cleaned? your unit need to general cleaning specially the sensors!
SOURCE: Comfort Aire PAC-121 problem
E4 shows up on the screen on my PAC-121 when the water reservoir on the right-hand-side is not pushed in all the way. If it is in all the way the switch that it engages may be bad or out of place.
SOURCE: Error code of E4 on Dometic HP air conditioner ??
16. SYSTEM RESET
a. Turn the ON/OFF switch to “OFF” position.
b. Simultaneously depress and hold the MODE and ZONE
push-buttons while turning the ON/OFF switch to “ON”.
FF should appear in the LCD display until the MODE
and ZONE push-buttons are released.
c. When a dip switch is turned on or off after initial configu
ration, a system reset will need to be done before the
Comfort Control CenterTM will recognize the updated selection. Try this. This is for the five button thermostat. Did you check the dip switches to be sure the proper ones are turned on? I need to know which stat you have 4 or 5 button. I have trouble shooting for both.
If you notice reset needs to take place after a dip switch is turned on or off. The dip switches are on the circuit board. You need to drop the lower cover. the dip switches will read in this order #1 heat strip/ #2 zone2/#3zone3/ #4 zone4/#5 furnace/#6 differential/#7stag/#8 gen start. Check this out and be careful. Turn off the stat to change dip switches. On will be toward the description. If you don't have remote start gen set the dip should not be on. If you dont have a Zone 3 the dip should not be on, etc.
Any questions feel free to post back
Thank you for using fixya
Jerry
SOURCE: E4 code is showing on my GE room air conditioner APE07AHM1
There is a water holding tank on the right lower side (when u are looking at the front), empty it and the unit comes back on.
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