Thermostats Crestron
CHV-TSTAT and CHV-THSTAT
Local Error Messages
When a critical sensor fails and prevents the safe or intended operation of the HVAC
equipment, an error message flashes on the main screen.
This error message appears as a text message under the line that normally reads
ON
LINE
and
VIEW MSG
. The thermostat messages are shown as follows in
descending priority.
ERROR DESCRIPTION
ERR! NO AT SRC
Indicates that no air temperature source is present,
because all available sensors designated USE have
generated errors during the current read cycle. HVAC
operation is suspended and relays are cleared, except on
SLAB1 type. SLAB1 type cannot generate this error
because it does not have an air temperature USE type.
ERR! NO SB SRC
Indicates that no slab temperature source is present,
because all available sensors designated SLAB have
generated errors during the current read cycle. HVAC
operation is suspended on all slab modes (1, 2, 3, 4A,
4B, 5A, 5B).
ERR! NO HM SRC
Indicates that no humidity sources are present, because
all available sensors designated USE have generated
errors during the current read cycle. Humidifier operation
is suspended and HUM relay is cleared.
ERR! NO OD SRC
Indicates that no outdoor source is present and the setup
says at least one remote is supposed to be providing OD
data (designated OD). This error does not disable HVAC
operation because it is not absolutely essential. All
heatpump modes that use outdoor temperature for
balance point operation will eventually stage or switch to
auxiliary heat and thus prevent the space from freezing.
NOTE:
All of these conditions are self-healing if the sensor begins sending valid
data.
84
•
Thermostats: CHV-TSTAT and CHV-THSTAT
Operations and Installation Guide – DOC. 8163C