Troubleshooting
78 RT-SVX21AC-EN
Table 27. Fault detection and diagnostic codes
Failures
Primary Fault Codes Information Code
Mixed Air
Temp
Sensor
Fail
Outd
oor
Tem
p
Sensor
Fail
Economizer
A
ctuator
Fau
lt
RTEM
Com
m
Fail
Pressure
De
ad band
Fail
(If Used)
Temp
Se
nsor
Fail
(If Used)
Airflow
Sensor Fail
(If U
sed)
Sp
ace
Press Dead
ban
d Fail
(If Used)
Unit Fails
to
Ec
onomize
Unit
Economizing
When It
Should Not
Damper
Positio
n %
Indica
ted
Damper stuck
at Mini
mum
X X
(a)
X(a) X(a) X X
Damper Stuck
Open
X X(a) X(a) X(a) X X
Mixed Sensor
Failure
X X
Supply Air
Sensor Failure
X X
Outdoor Air
Temperature
Fail
X X
Power loss to
RTEM
X
Failed or Power
Loss to
Actuator
X X
Mechanical
Failure of
Actuator
X
(a) If goes out of range.
Table 28. Low leak economizer sensor values
Sensor Values Data
Temp °F Resistance (K ohms) Temp °F Resistance (K ohms) Temp °F Resistance (K ohms)
40 26.097 54 17.847 68 12.435
41 25.383 55 17.382 69 12.126
42 24.690 56 16.930 70 11.827
43 24.018 57 16.491 71 11.535
44 23.367 58 16.066 72 11.252
45 22.736 59 15.654 73 10.977
46 22.132 60 15.253 74 10.709
47 21.530 61 14.864 75 10.448
48 20.953 62 14.486 76 10.194
49 20.396 63 14.119 77 9.949
50 19.854 64 13.762 78 9.710
51 19.330 65 13.416 79 9.477
52 18.821 66 13.078 80 9.250
53 18.327 67 12.752 81 9.030
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