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How do I fix a P4 error code on my Mr. Cool Portable Air Conditioner?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The mr cool p4 error code is a code that indicates that the unit is not receiving enough power. This can happen for a variety of reasons, including a power outage, a blown fuse, or a tripped circuit breaker. If the unit is not receiving enough power, it will not be able to operate properly.

Users typically search for a solution by asking about:

  • p1 error code
  • mr cool p4 error code

1. Check the thermostat to make sure it is turned on

  1. Open the door to the mr cool p4 to check if the air conditioner is on.
  2. If the air conditioner is not on, turn the thermostat to the desired temperature.
  3. If the air conditioner is on but the temperature is not the desired temperature, check the connections between the thermostat and the air conditioner.
  4. If the connections between the thermostat and the air conditioner are okay, check the power to the thermostat.
  5. If the power to the thermostat is okay, check the wires inside the thermostat.
  6. If the wires inside the thermostat are okay, replace the thermostat.

2. Check the breakers to make sure they are not tripped

  1. Open the hood and check the fuses.
  2. Check the breakers.
  3. If the breakers are not tripped, replace the fuse or breakers.

3. Check the filters to make sure they are not dirty

  1. Turn off the Mr. Cool P4 and unplug it from the power source.
  2. Remove the filter cover.
  3. Inspect the filter for any dust, dirt, or debris.
  4. If the filter is dirty, replace it with a new one.
  5. Reinstall the filter cover and plug in the Mr. Cool P4.
  6. Check the error code to see if the filter was the cause of the problem.

4. Check the evaporator coil to make sure it is not frozen

  1. Check for proper refrigerant charge – If the refrigerant charge is low, the coil may be frozen. Check the system for leaks and correct any issues.
  2. Check for power to coil – If the coil is not getting power, it may be frozen. Check the system for power to the coil and correct any issues.
  3. Check for ice build-up – If there is ice build-up on the coil, it may be frozen. Check the coil for obstructions and correct any issues.

5. Check the condenser coil to make sure it is not dirty

  1. Turn off the AC power to the unit.
  2. Remove the cover on the front of the unit.
  3. Look for the condenser coil on the top of the unit.
  4. If it is dirty, clean it with a soft cloth or a damp paper towel.
  5. Replace the condenser coil if it is dirty.
  6. Reattach the cover to the front of the unit.
  7. Turn on the AC power to the unit and check the error code.

If you didn't find success with an option above, then try:

  1. Check the compressor to make sure it is not burned out.
  2. Call a professional to service the unit.