Evc Status Codes (Green Led); Evc Fault Codes (Red Led) - Trane 7 Series Field Reference Data

EVC STATUS CODES (GREEN LED)

EVC STATUS LED (Non Heat Pump Systems)
Flash
1 Cool mode selected / No active call
2 Active call for 1st stage cooling
Active call for 2nd stage cooling
3
NOTE:
(1) Single stage OD systems will report 2nd stage flash codes
EVC STATUS LED (Heat Pump Systems)
Flash
1 Cool mode selected / No active call
2 Active call for 1st stage cooling or defrost
3 Active call for 2nd stage cooling or defrost (1)
4 Heat mode selected or Thermostat system switch off
5 Active call for 1st stage heating
6 Active call for 2nd stage heating (1)
NOTE:
(1) Single stage OD systems will report 2nd stage flash codes

EVC FAULT CODES (RED LED)

EVC
Fault LED
OFF Standby
1 Stepper Motor coil has an open circuit or intermittent short
Control has detected an internal failure (Replace EEV control, EVC)
2
3 Gas Temperature Sensor (GT) input out of range (Verify resistance, 5VDC output from control)
4 Evaporator Temperature Sensor (ET) input out of range (Verify resistance, 5VDC output from control)
5 Stepper Motor Coil is shorted
6 Valve is not responding to a change in position. (Possible stuck valve)
High superheat (Low charge or restriction)
7
Low superheat (Check airflow, possible stuck valve)
10
11 Condensate drain switch activated for 100 seconds (Check condensate switch and drain)
13 Indoor frost protection activated (Check refrigerant charge and airflow)
14 Internal communication fault (All operation is terminated) (Cycle power & check wire terminations)
15 Configuration fault (All operation is terminated) (Cycle power & check if PM error is present)
Outdoor status fault (All operation is terminated)
16
(1) EEV will try to go to a safe position, cooling attempt allowed
NOTES:
(2) K1 relay opens on EVC, Yo disabled
(3) Cooling attempt allowed, 5 consecutive Y calls with same condition disables Yo
UNIT LED (BLUE LED)
Unit LED
1 Flash Normal (1 flash every 4 seconds)
Rapid Communication Busy Error (2 flashes per second)
Communications cannot be established with the AFC
SOLID ON
Off No Power
(1)
Description
(2)
(3)
Description
TAM7­21
STATUS
LED
UNIT
LED
FAULT
LED
(1)
(2)
(2)
FAULT
FAULT
K2
R70
R100
D28
R80
R73
STATUS
UNIT
FAULT
OFF ON
410 22
J4
OPEN
TEST
CLOSE
(1)