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HomeRepair HelpColeman Central A/C RepairColeman Central air conditioner wall thermostat not working properly Repair
Coleman Central air conditioner wall thermostat not working properly
When your Coleman central air conditioner thermostat is not working, start with the wall thermostat itself, the most likely cause. A failed thermostat may have a blank display, fail to regulate room temperature, or stop sending the 24-volt signal that turns the air conditioner on. A Coleman wall thermostat can show similar symptoms, including thermostat not communicating with the air conditioner. Next, check the thermostat batteries if the display is dead, then inspect the control board in the furnace or air handler, which supplies low-voltage power to the thermostat. A tripped circuit breaker, blown fuse, or power switch turned off at the furnace or air handler can also make the thermostat appear dead. Damaged or loose thermostat wire may prevent the system from receiving heating or cooling commands. You can replace batteries and inspect accessible wiring, but turn off power before opening equipment. Testing the control board or electrical supply requires caution, and 240-volt line-voltage work should be handled by a qualified technician. Enter your Coleman central air conditioner model number to find the exact replacement thermostat, wall thermostat, control board, fuse, or other part for your specific system.
01 - Coleman Central Air Conditioner Wall Thermostat
The wall thermostat is responsible for controlling components and regulating the home's temperature. The thermostat can be powered with 24 volts from a control board on a separate unit like a furnace or air handler, or from batteries in the thermostat itself. The thermostat also has terminals to receive and distribute low voltage 24 volt power to run different HVAC products such as a furnace, air conditioner, or heat pump. If the wall thermostat is receiving power but the display is dead, or it will not send power out in the appropriate modes, the wall thermostat will need to be replaced.
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Highly Likely
02 - Coleman Central Air Conditioner Wifi Thermostat
The WiFi thermostat is responsible for controlling components and regulating the home's temperature. The thermostat is usually powered with 24 volts from a control board on a separate unit like a furnace or air handler. The thermostat also has terminals to receive and distribute low voltage 24 volt power to run different HVAC products such as a furnace, air conditioner, or heat pump. If the WiFi thermostat is receiving power but the display is dead, or it will not send power out in the appropriate modes, the WiFi thermostat will need to be replaced.
Highly Likely
03 - Wall Thermostat Batteries
Most wall thermostats are either powered by an enclosed battery or by the furnace or air handler control board. If the thermostat display is dead, you can remove the thermostat cover and look for replaceable batteries. Replace the batteries if needed and check operation.
Common
04 - Coleman Central Air Conditioner Control Board
The control board regulates the power supply to all of the components in the system. If the control board fails, it might not send voltage to the thermostat, leaving the thermostat inoperable.
Less Common
05 - Incoming Power Problem
Check to see if there is power to the furnace or air handler. One or more indicator lights on the control board should be illuminated. If there is no power to the furnace or air handler, check to see if a circuit breaker has tripped or a fuse has blown. Confirm the power switch on the side of the unit is turned on.
Less Common
06 - Bad Wall Thermostat Wiring
In order to send signals from and to the indoor and/or outdoor units, the wall thermostat uses a group of wires usually called thermostat wiring. If the thermostat wiring gets damaged, certain functions of the system or the thermostat itself may not function properly. The thermostat wiring can be checked for power or continuity with a multimeter. The wiring is usually industry standard colors: Red/White/Yellow/Green for a four-wire system.
Less Common
Frequently Asked Questions
Why is my Coleman thermostat not working or showing a blank display?
Why is my Coleman thermostat not turning on the AC?
How do I test Coleman thermostat wiring and the control board?
Could a bad thermostat cause my Coleman central air conditioner not to cool?
How do I find the correct replacement thermostat for my Coleman air conditioner?
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