TAM723
HHC
Fault LED Description
OFF Nofault
1 Internalcommunicationerror
2 Watertempisat38Forlower
3 Watertempsensorisshorted
4 Watertempsensorisopen
5
Configurationerror
(1)
6 Heatdemanderror
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
.
TRANEU.S.INC.
UNIT
STATUS
FAULT
13.8V
DATA A
DATA B
GND
Pb
D18
D
16
D14
D12
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
R34
R33
R
32
R
3
1
R
30
R29
R28
R27
R26
R2
5
R24
R
2
3
R22
R2
0
R19
R1
8
R17
R16
R
1
5
R14
R13
R
12
R11
R
10
R9
R8
R7
R6
R5
R4
R3
R2
R1
Q1
P6
P5
P1
D13
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
C13
C12
C11
C9
C8
C7
C6
C5
C4
C3
C2
C1
C14
R40
R41
C10
C15
C17
R42
R43
HHC STATUS LED
1 per second
2 per second
Description
Standby or idle (see note)
Heating demand is present
UnitLED
1Flash
Rapid
Off NoPower
Description
Normal(1flashevery4seconds)
CommunicationBusyError(2flashespersecond)
SOLIDON
CommunicationscannotbeestablishedwiththeAFC