Carrier programmable thermostat flashes E3

https://www.youtube.com/watch?v=dkMCdjJdKRs
The E1 or E2 error code is an Auto-Stop Protection Error, indicating an issue detected by a sensor. This error code will require service. The E3 error code displays when an Abnormal Operation Protection Error has occurred, and activates to protect the unit from damage. This error code will require service.
https://www.lg.com/us/support/help-library/e1-e2-or-e3-error-code-CT10000014-1340721215523
In this case, you need to drain water and remove the laundry. Then, run the rinse mode to clean the drum. Next, start the technique to make sure that the OC error has disappeared. If the washing machine is not correctly connected to the drain hose, OE, OF, E3 will appear on display.
https://all-errors.com/samsung-washing-machine-error-code-e3/

AC
The E1 or E2 error code is an Auto-Stop Protection Error, indicating an issue detected by a sensor. This error code will require service. The E3 error code displays when an Abnormal Operation Protection Error has occurred, and activates to protect the unit from damage. This error code will require service.Dec 20, 2018
https://www.lg.com/us/support/help-library/e1-e2-or-e3-error-code-CT10000014-1340721215523

Your Air Conditioner Displays E1 (E2, or E3) In The Display ...

support-us.samsung.com/.../pop_troubleshooting_fr...
Samsung ElectronicsJul 8, 2010 - Home > Operation? > Your Air Conditioner Displays E1 (E2, or E3) In The Display Panel And Won't Turn On Share on Google+ Share on ...

How To Clear Sharp Air Conditioner E1 "Clean Filter" Error ...

sci.tech-archive.net > Archive > sci.electronics.repair > 2005-08
Aug 5, 2005 - Owners of Sharp air conditioner models ... the error code E1 will appear... following procedure to clear the nefarious E1 indication, and obtain

Error Code:
E1 Loss of communication between the Single Zone LCD thermostat and the mod-ule board. LCD will cycle between E1 and the previous mode setting. System
will shut down.
E2 Open circuit or out of range Indoor Temperature Sensor. Heating and cooling
operation will be locked out. Fan operation can continue to operate.
E3 Shorted Indoor Temperature Sensor. Heating and cooling operation will be
locked out. Fan operation can continue to operate.
E4 Open circuit or out of range Outdoor Temperature Sensor (select models). Heat
Pump operation will be locked out. Air Conditioner, Fan and Furnace operation
can continue to operate.
E5 Open circuit or out of range Freeze Sensor. Air conditioner mode of operation
will be locked out. Furnace, heat strip, heat pump and fan mode of operation can
continue to operate but displays the last temperature set-poi

E-2 in Carrier Thermostat-Not enough voltage for the thermostat. Contact dealer for further information. Thanks.

Hello there
I have written a list of codes that should cover your problem nd give you some idea what to check ok
E1 or E2 Thermistor Failure The dryer will not operate if the exhaust temperature drops below 18 degrees F. or exceeds 250 degrees F.

When the thermistor circuit is open (>50K ohms), the error code E1 flashes in the display.

When the thermistor circuit is shorted (<500 ohms), the error code E2 flashes in the display.

Normal thermistor resistance values:
60 degrees F. - 15.3K ohms.
70 degrees F. - 11.9K ohms.
80 degrees F. - 9.2K ohms. E3 Touchpad or Software mismatch Flashes when there is a touchpad or software

Sounds like something is going on with the compressor or the outdoor unit. Call a service company

the e2 error on your thermostat is a problem with the return temp sensor on your system, the only thing you can really do is call a company and replace it, you can't bypass it or remove it cause the system wont run properly

Carrier Air Conditioning display an error code E5 and then swtich off