TAM820
HHC
Fault LED
Description
OFF
No fault
1
Internal communication error
2
Water temp is at 38F or lower
3
Water temp sensor is shorted
4
Water temp sensor is open
5
Configuration error
(1)
6
Heat demand error
1) Confirm heater model and dip switch configuration
NOTES:
HHC STATUS CODES (GREEN LED)
HHC FAULT CODES (RED LED)
HHC UNIT LED (BLUE LED)
UNIT
STATUS
FAULT
GND
13.8VDC
+5V
.
TRANE U.S. INC.
UNIT
STATUS
FAULT
13.8V
DATA A
DATA B
GND
Pb
D1
8
D
16
D14
D
12
D15
D17
R48
R47
R46
R45
R44
MOV1
1
SW1
K1
AUX
PGC
PGD
VSS
VDD
MCLR
.
P3
C16
1
P4
X
1
U3
U2
U1
R
39
R37
R36
R35
R3
4
R3
3
R
32
R
31
R
30
R2
9
R2
8
R27
R26
R2
5
R
24
R
23
R2
2
R2
0
R1
9
R1
8
R17
R1
6
R
15
R14
R1
3
R
12
R11
R
10
R
9
R8
R7
R6
R5
R4
R3
R2
R1
Q1
P6
P5
P1
D13
D11
D1
0
D9
D8
D7
D6
D5
D4
D3
D2
D1
C13
C12
C1
1
C9
C8
C7
C6
C5
C4
C3
C2
C1
C14
R40
R41
C1
0
C1
5
C17
R4
2
R4
3
HHC STATUS LED
1 per second
2 per second
Description
Standby or idle (see note)
Heating demand is present
Unit LED
1
Flash
Rapid
Off
No
Power
Description
Normal
(1
flash
every
4
seconds)
Communication
Busy
Error
(2
flashes
per
second)
SOLID
ON Communications
cannot
be
established
with
the
AFC