Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpIntertherm Central A/C RepairIntertherm Central air conditioner wall thermostat not working properly Repair
Intertherm Central air conditioner wall thermostat not working properly
An Intertherm wall thermostat is not working, the most likely cause is a failed wall thermostat. A thermostat that has a blank display, receives power but will not send the correct signal, or is not turning on the AC may need replacement. An Intertherm wall thermostat can show the same symptoms. Before replacing either thermostat, check the thermostat batteries, since weak or dead batteries are a common cause of a blank display. Less commonly, a failed control board in the furnace or air handler may stop supplying 24-volt power to the thermostat. Also check for an incoming power problem, such as a tripped circuit breaker, blown fuse, or unit power switch that is off. Damaged thermostat wire can prevent the thermostat from communicating with the indoor or outdoor unit and may require continuity testing with a multimeter. Turn off power before inspecting wiring. Testing or replacing a control board, transformer, circuit breaker, fuse, or other line-voltage component should be handled by a qualified technician. Enter your Intertherm central air conditioner model number to find the exact replacement thermostat, battery, control board, or wiring part for your system.
01 - Intertherm 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.
Enter model number to search for the required part specific to your product
Highly Likely
02 - Intertherm 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 - Intertherm 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 Intertherm central air conditioner thermostat not working?
What should I check if my Intertherm thermostat is blank or not turning on the AC?
How do I test Intertherm thermostat wiring when the AC will not turn on?
Could a bad Intertherm control board or transformer cause thermostat problems?
How do I find the correct replacement Intertherm thermostat or thermostat part?
Shop by Intertherm Central Air Conditioner Parts
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com