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

EHC STATUS CODES (GREEN LED)

EHC STATUS LED
1
2
3
4
5
NOTES

EHC FAULT CODES (RED LED)

EHC Fault
LED
OFF No fault
1 Internal communication error
2 Heat relay stuck open
3 Heat relay stuck closed
4 Non‐cycling limit (NTCO) or element open
5 Cycling limit (CTCO)open
Configuration error
6
8 Blower interlock relay stuck open or stuck closed
NOTES:
1) Confirm heater model and kw jumper match
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 heater relay energized or stand by (see note)
2 heater relays energized
3 heater relays energized
4 heater relays energized
5 heater relays energized
Standby mode STATUS LED will flash 1 time per second
On a call for heat, STATUS LED will flash per the table above every 4 seconds
Description
(1)
Description
Description
UNIT
LED
STATUS
LED
FAULT
LED
TAM7­22
T3 T4
T1 T2
K2 K3
K1
R6
R1
R3
R44 R45
R8
R13
R4 R2 R9 R7 R14
U5 U6
D3
D1 R5
D2
R10
TRANE U.S. INC.
R28
R40
D12
UNIT
D9
X1
C1
R26
+13.8V
D23
D10
U1
STATUS
D7
U2
R27 R31
JP1
D11
FAULT
D8 C13
P1
C5
1
R41
R35
C12
T6 T7
T5 T8 T9
K4 K5
R11 R16
R47
R46
R18 R23
R12 R19 R17 R24
U7
U8
D4
D5
R20 GND
R15
D25
D24 C8
R49
+5V
R53
D20
R36
R63
C7
R62
P3 C6
U3
R59 U4
R50
C2
R57
R73
R58
R70 C3 C11
R72
R67
R32
P2
K6
R68
D21 R39