Carrier Troubleshooting Thermostat E2 Code Errors
Page 2

Battery Changeout- If the installation requires tile

usage of batteries, the batteries will require replacement every 12 months.

Open thermostat door and slide the battery compartment door to the fight. Remove two AA alkaline batteries. Install two new AA alkaline batteries following the polarity markings (+ / -) on the thermostat.

NOTE: If installation is hard-wired, batteries are not required and will not need to be replaced.

Error Codes --Ifthe thermostat displays "--", "E2", "E3", or "E4" in the LCD, an error is present. See Table 1 for enor codes and descriptions.

Table 1 --Error Codes

SYMPTOM

 

WHAT TO CHECK

Blank LCD

Check for 24

vac between R and C at terminal connections or battery.

"--" (2 dashes) on temperature display

Temperature

sensor reading out of range. Check sensor for damage. If recycling power

does not clear display, thermostat should be replaced.

"E2"

on temperature

display

Brownout condition

or too

low of voltage to thermostat.

Double check wiring and

check for

 

 

 

 

 

 

 

24 vac between R and C. E2 will clear 15 sec after proper voltage is restored.

 

"E3"

on temperature

display

The

outdoor temperature

sensor

is open, not connected, or shorted.

 

"SERVICE FILTER" on temperature display

After

the selected number

of hour

of blower

operation

"FILTER" will display on LCD. This is

 

 

 

 

 

 

 

to remind the home owner to "check" the filter. Press RESET FILTER button to clear display

 

 

 

 

 

 

 

and reset timer to 0.

 

 

 

 

 

 

Cooling

will

not

come

on

Select COOL mode. Set desired temperature

to 10° F below room temperature.

Simulta-

 

 

 

 

 

 

 

neously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for

 

 

 

 

 

 

 

COOL ON icon and 24 vac at Y (first-stage) terminal. If present, thermostat is okay and

 

 

 

 

 

 

 

3roblem is with equipment or wiring. If not present, replace thermostat.

 

Heating

will

not

come

on

Select HEAT mode. Set desired temperature

to 10 ° F above room temperature.

Simulta-

 

 

 

 

 

 

 

neously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for

 

 

 

 

 

 

 

HEAT ON and 24 vac at Y (first-stage) terminal (with heat pump) or W/W1 (with air condi-

 

 

 

 

 

 

 

tioner) terminal. If present, thermostat is okay and problem is with equipment or wiring. If

 

 

 

 

 

 

 

not present, replace

thermostat.

 

 

 

 

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Contents Operation Setting Indoor Temperature Set PointsGeneral Auto Changeover Operation --The thermostat willError Codes What to CheckThermostat Display and Buttons Residential Thermostat Limited ONE-YEAR Warranty

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