24
TAM7-SF-2E-EN
EVC STATUS LED (GREEN)
(Non-Heat Pump Systems)
FAULT
R80
R70
D
D28
R73
R100
K2
J 4
TEST
CLOSE
410
FAULT
UNIT
22
OPEN
STATUS
FAULT
OFF
ON
STATUS
LED
FAULT
LED
UNIT
LED
Flash
1
Cool mode selected / No active call
2
Active call for 1st stage cooling
3
Active call for 2nd stage cooling
(a)
EVC STATUS LED (GREEN)
(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
4
Heat mode selected or Thermostat system switch off
5
Active call for 1st stage heating
6
Active call for 2nd stage heating
(a)
Single stage OD systems will report 2nd stage flash codes.
UNIT LED (BLUE)
DESCRIPTION
Click or Scan to see a video on EVC Fault
Codes
1 Flash
Normal (1 flash every 4 seconds)
Rapid
Communication Busy Error (2 flashes per second)
SOLID ON
Communications cannot be establish with the AFC
Off
No Power
EVC
FAULT
LED
(RED)
DESCRIPTION
POSSIBLE CAUSES
OFF
Standby
1
Stepper Motor or wiring harness has an open circuit or
intermittent short.
Faulty EEV motor / wiring harness.
2
Control has detected an internal failure
Verify EEV motor & harness resistance. EEV motor drive, motor
feedback, or 12v failure
3
Evaporator Temperature Sensor (ET) input out of range
(a)
Sensor open / shorted, unplugged, wiring harness problem. Verify
5VDC output from control
4
Gas Temperature Sensor (GT) input out of range
Sensor open / shorted, unplugged, wiring harness problem. Verify
5VDC output from control
5
Stepper Motor Coil is shorted
(b)
Faulty EEV motor / wiring harness
6
Valve is not responding to a change in position.
Possible stuck valve, ET/GT sensor calibration
7
High superheat
System low on charge, liquid line restriction, ET/GT sensor
calibration
10
Low superheat
(c)
Stuck valve, ET/GT sensor calibration, restricted distributor line
that ET is connected to, check valve leaking
11
Condensate drain switch activated for 100 seconds
Condensate line clogged, clean switch
13
Indoor frost protection activated
(TAM8 unit will disable all
operation for 30 minutes to allow coil defrost)
Low / incorrect airflow, low refrigerant charge, ET sensor
calibration. Normal for low ambient cooling
14
Internal communication fault (All operation is terminated)
Verify harness continuity between J2 of the EVC and J4 of the
Distribution Board
15
Configuration fault (All operation is terminated)
Check if PM error is present, cycle power to the unit
16
Outdoor status fault (All operation is terminated)
Cycle power to the unit, replace EVC if error persists
(a)
EEV will try to go to a safe position, cooling attempt allowed
(b)
K1 relay opens on EVC, YO disabled
(c)
Cooling attempt allowed, 5 consecutive Y calls with same condition disables YO
