Honeywell thermostat won't regulate temp properly

If your Comfort Zone CZ230ER is not cooling down to the setpoint and shutting off, there could be several potential issues causing this problem. Here are a few things to check:

1. Check the air filter: A dirty or clogged air filter can restrict airflow and cause the unit to overheat. Be sure to clean or replace the air filter as needed.
2. Check the thermostat: If the thermostat is faulty, it may not be accurately sensing the temperature in the room, which can prevent the unit from cycling properly. Try replacing the thermostat to see if that resolves the issue.
3. Check for leaks: If the refrigerant level is low due to a leak, the unit may not be able to cool properly. Have a professional inspect the unit for leaks and repair them as needed.
4. Check the compressor: If the compressor is faulty, it may not be able to properly circulate refrigerant through the system, which can prevent the unit from cooling. A professional will need to diagnose and repair any issues with the compressor.
5. Check the fan motor: If the fan motor is not functioning properly, it can prevent the unit from properly circulating air, which can cause it to overheat and shut off prematurely. Check to see if the fan is running smoothly and replace the motor if necessary.

If you are unsure how to perform any of these checks or repairs, it's best to consult a professional HVAC technician.

First be sure the hole in the wall behind the tstat is sealed with putty or the like. This could be your issue due to negative pressure in the house. What you are describing may be something different, the unit should eventually catch up and satisfy if it was working properly. The house would just be cooler. There is a calibration feature that can change the room temp +/- 5 degrees but seal the whole and measure the return air temp vs the supply air temp AT the unit, NOT the grills.

It's doing whats it is supposed to do and that's regulating the ambient temperature to your set temp.

If it 2 degree cooler then that's fine .adjust your thermostat 2 degrees higher so you will get the temperature

If you are talking about the difference between heating mode and cooling mode and the room setpoint, you can not change it. It comes from the factory with a 3 degree difference. In other words if you raise the heat setpoint until it is within 3 degrees of the cooling setpoint, for every degree you raise the heat setpoint the cooling will raise a degree.
About all you can do is increase the distance between the heat and cooling setpoint. To do this either lower the cooling setpoint to 3 degrees higher than the heat setpoint you want and then increase the cooling setpoint the desired setting. For example heat and cool setpoints are 67 and 70 respectively, and you want 65 and 73. Lower the cooling setpoint to 68 and then raise the cooling setpoint to 73. Now your heating will come on 3 degress lower than 68, the 65 you wanted and cooling will come on at 73. Remember, the thermostat new setpoints will turn on the cooling at 75 and turn back off at 73 and heat will turn on at 63 and turn off at 65.
You can perform the same using the heating setpoint, just have to look at it backwards. If you need to lower the difference I recommend a 8000 series thermostat. They are the most functional thermostat that Honeywell makes, be in mind they are about 3 times more expensive and many of the setting require a well trained tech to interpret and set properly.
Hope this helps.

Hello Try RAISING the temp setpoint in COOL mode,sometimes there is a deadband so unit will not conflict.

Set System Switch to Cool and lower setpoint below room temperature.
Verify thermostat and system wires are securely attached.
Diagonistic: Set System Switch to Cool and lower the setpoint below the room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation ( . If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a service person to verify the heating system is operating correctly.

Reset the thermostat by pressing , UP,DOWN and TIME at the same time.

They will work, most zone controls only require the use of 1H/1C thermostats, the system stages and functions are controlled by the board itself.
http://customer.honeywell.com/TechLit/pdf/PackedLit/68-0237.pdf

thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.