TAM822
ALERT CODES FOR *AM8
Alert
Code
Alert Group
Display
Assembly Text
A/TCONT900
A/TZONE 950
Notification
Level
AFC
Fault
Code
EVC
Fault
Code
EHC
Fault
Code
HHC
Fault
Code
Alert Description
Possible Cause
18
Control failure
CNTRL FLT
ERR18
ERR 18.0
Critical
ON
Internal Control Error
Control fault, replace AFC
19
Twinning fault
TWIN ERR
ERR19
ERR 19.0
Information
8
Air handler twinning error
More than one ID unit connected on the
communicating bus is not allowed
52
Indoor air sensor error
ICAS OPEN
N/A
N/A
Information
6
Indoor air sensor is open
Sensor open, unplugged, wiring harness
52
Indoor air sensor error
ICAS SHORT
N/A
N/A
Information
6
Indoor air sensor is shorted
Sensor shorted, wiring harness
90
Communication busy fault
SYS COM CRC
N/A
N/A
Information
3
Excessive communication errors
R & B to thermostat reversed polarity
91
Communication inactive fault
SYS COMM
ERR
ERR91
ERR 91.02
Critical
3
Loss of Heat/Cool demand message
Open / Shorted data line / CCM
communication error
91
Communication inactive fault
NO SYS CLK
ERR91
ERR 91.03
Critical
3
Loss of Bit Master
Control fault, replace AFC
92
Fuse failure
CHECK FUSE
N/A
N/A
Critical
1*
24V fuse open error
24VAC circuit short
104
Heater relay fault
EH RLY
OPEN#
ERR104
ERR 104.0
User Display
12
2
Heater relay stuck open error
Heater relay failure
104
Heater relay fault
ALL RLY OPEN
ERR104
ERR 104.02
Critical
12
2
All heater relay stuck open error
Heater relay failure
104
Heater relay fault
EK RLY
WELD#
ERR104
ERR 104.01
Critical
12
3
Heater Relay Stuck Closed Error
Heater relay failure, open element, open
non cycling limit switch
105
Heater interlock relay fault
BL INTLK OP
ERR105
ERR 105.0
User Display
12
8
Interlock Relay Stuck Open Error
Blower interlock relay failure
105
Heater interlock relay fault
BL INTLK CL
ERR105
ERR 105.01
User Display
12
8
Interlock Relay Stuck Closed Error
Blower interlock relay failure
106
External shutdown fault
EXT SW OPEN
ERR106
ERR 106.0
User Display
1
External shutdown input open error
External float switch, other device open
114
PM bad or missing fault
PM DATA ERR
N/A
N/A
Information
2
PM data corrupt (Operation allowed)
PM error
114
ID motor error
ID MTR ERR
ERR114
ERR 114.02
User Display
2
Motor HP is < than PM value (Operation
not allowed)
Incorrect VS motor or PM installed
114
PM bad or missing fault
PM MISSING
ERR114
ERR 114.03
Critical
2
PM missing with good local copy
(Operation allowed)
PM error
114
PM bad or missing fault
PM UNIT ERR
N/A
N/A
Information
2
Bad data in PM with good local copy
(Operation allowed)
PM error
114
PM bad or missing fault
PM MEM ERR
ERR114
ERR 114.05
Critical
2
Bad data in PM with no local copy
(Operation allowed)
PM error
114
PM bad or missing fault
PM MISSING
ERR114
ERR 114.06
Critical
2
PM missing with no local copy (Operation
not allowed)
PM error
114
ID motor error
MTR PWR HI
ERR114
ERR 114.07
User Display
2
Motor HP is > than PM value (Operation
allowed)
Incorrect VS motor or PM installed
123
Demand configuration fault
EH CONFIG
ERR123
ERR 123.0
User Display
12
6
Electric heat configuration rrror
KW jumper position on PARK
(replacement control only)
152
Heater element fault
EH ELMNT
OP#
ERR152
ERR 152.0
User Display
12
4
Heater element open
Low airflow, dirty coil/filter
153
Thermal limit switch fault
EH CTCO TRIP
ERR153
ERR 153.0
User Display
12
5
Cycling thermal cut-out trip has occurred
Low airflow, dirty coil/filter
154
EH airflow limit fault
EH OFF/NO AF
ERR154
ERR 154.0
Critical
12
7
Electric heat control locked out because of
insufficient airflow
EHC locked out
154
EH airflow limit fault
EH LIM/NO AF
ERR154
ERR 154.1
User Display
12
7
Electric heat control is under restricted
operation because of insufficient airflow
Heater-Air handler mismatch
155
Indoor electronic expansion valve
motor fault
EEV MTR ERR
ERR155
ERR 155.0
User Display
11
5
EEV motor fault has been detected for 8
consecutive times and valve is locked out
Faulty EEV motor / wiring harness
155
Indoor electronic expansion valve
motor fault
EEV MTR ERR
ERR155
ERR 155.01
User Display
11
1
EEV electric motor current indicates open
or short
Faulty EEV motor / wiring harness
156
System low on charge fault
SYSTEM1
ERR
ERR156
ERR 156.0
User Display
11
7
System 1 - High superheat
System low on charge, liquid line
restriction, ET/GT sensor calibration
157
Condensate fault
CONDESAT
FLT
ERR157
ERR 157.0
Critical
11
11
Condensate overflow condition detected
Condensate line clogged
158
Coil freeze fault
ID COIL FRST
ERR158
ERR 158.0
User Display
11
13
Indoor coil freeze condition detected
Low / incorrect airflow, low refirgerant
charge, ET sensor calibration
159
Unit Bus fault
AFC COMM
ERR
ERR159
ERR 159.0
Critical
5
14
1
1
AFC communication error
Wire harness between AFC and
distribution board
EHC COMM
Wi
h
b t
EHC
d
159
Unit Bus fault
EHC COMM
ERR
ERR159
ERR 159.01
User Display
5
1
EHC communication error
Wire harness between EHC and
distribution board
159
Unit Bus fault
HHC COMM
ERR
ERR159
ERR 159.02
User Display
5
1
HHC communication error
Wire harness between HHC and
distribution board
159
Unit Bus fault
EVC COMM
ERR
ERR159
ERR 159.03
User Display
5
14
EVC communication error
Wire harness between EVC and
distribution board
159
Unit Bus fault
CDA COMM
ERR
ERR159
ERR 159.04
Information
5
Display Assembly communication error
Wire harness between Display Assembly
and distribution board
160
Indoor EEV control configuration error
CONFIG FLT
ERR160
ERR 160.0
User Display
11
15
Configuration group index or evap
temperature sensor type are not
configured
PM programming or internal
communication error
161
Evaporator temperature sensor fault
ET SEN ERR
ERR161
ERR 161.0
User Display
11
3
Indoor coil temperature sensor reading is
out of range, indicates open or short
Sensor open / shorted, unplugged, wiring
harness problem
161
Gas temperature sensor fault
GT SEN ERR
ERR161
ERR 161.01
User Display
11
4
Indoor coil temperature sensor reading is
out of range, indicates open or short
Sensor open / shorted, unplugged, wiring
harness problem
163
Indoor EEV control fault
EEV CNTL FLT
ERR163
ERR 163.0
User Display
11
2
EEV electric motor drive or feedback or 12
V failure detected
EEV motor drive or motor feedback or 12v
failure
164
Indoor EEV fault
EEV CLSE
ERR
ERR164
ERR 164.0
User Display
11
6
EEV migrated to 'Close' position but
superheat is not at the desired set point,
valve is not responding to a change in
position
Possible stuck valve, ET/GT sensor
calibration
164
Indoor electronic expansionvValve fault
EEV OPEN
ERR
ERR164
ERR 164.01
User Display
11
6
EEV migrated to 'Open' position but
superheat is not at the desired set point,
valve is not responding to a change in
position
Possible stuck valve, ET/GT sensor
calibration
166
Superheat is flooding fault
SYSTEM4 ERR
ERR166
ERR 166.0
User Display
11
10
System 4 - Low superheat
Stuck valve, ET/GT sensor calibration,
restricted distributor line that ET is
connected to
167
Indoor electronic expansion valve
control is not controlling because
outdoor status is unknown
OD DATA MISS
ERR167
ERR 167.0
User Display
11
16
OD status unknown to EVC
If Comm LED on OD unit is flashing the
correct device count, replace AFC
outdoor status is unknown
,
p
168
Indoor heat demand is not available to
hydronic heat control
HH FAULT
ERR168
ERR 168.0
User Display
12
6
Hydronic Heat is not controlling because
Indoor heat demand is not received
If Unit LED on HHC is flashing once every
four seconds, replace HHC
169
Hydronic heat control configuration
fault
HH CONFIG
ERR169
ERR 169.0
User Display
12
5
Hydronic heat capacity is unknown to
hydronic heat control
Dip switch on HHC not set (replacement
control only)
170
Hydronic heat control freeze condition
detected
HH FRZ DET
ERR170
ERR 170.0
User Display
12
2
Hydronic heat coil freeze detected
Hydronic coil freeze inlet temperature
sensor reading is less than 38ºF
171
Communication inactive fault
BLW COMM
ERR
ERR171
ERR 171.0
Critical
4*
Blower Communication is not detected
Faulty wiring harness, VS motor
172
Display Assembly stuck key
KEY FAULT
ERR172
ERR 172.0
User Display
Display Assembly has a stuck key
Faulty Display Assembly
173
Open coil freeze sensor (hydronic heat
only)
HH FRZ OPEN
ERR173
ERR 173.01
User Display
12
4
Hydronic coil freeze inlet temperature
sensor open condition detected
Sensor open, unplugged, wiring harness
open
173
Shorted coil freeze sensor (hydronic
heat only)
HH FRZ
SHORT
ERR173
ERR 173.0
User Display
12
3
Hydronic coil freeze inlet temperature
sensor short condition detected
Sensor short, wiring harness shorted
Notes:
1. * AFC STATUS LED will be solid ON during this fault
•
2. COMM LED (amber) will flash the number of communicating devices connected
3. BM LED should be ON Solid when power is applied
4. STATUS LED will flash once per second in Idle mode.
Once a thermostat demand is received, it will flash 1 time/100 CFM requested
5. UNIT LED (blue) will flash once every four seconds when communications are norma
