Distech Controls RT Series User Manual

30
Troubleshooting guide
All models
Symptom
Possible Cause
Corrective Action
No display on the
thermostat
Absent or incorrect supply
voltage
1. Check power supply voltage between C & RC to be
from 19-30 Vac
2. Check for tripped fuse or circuit breaker
Overloaded power
transformer
Verify that the transformer used is powerful enough
(enough VA’s) to supply all controlled devices
including the thermostat
Keyboard menu does
not access all functions
Keyboard locked
Change configuration parameter LOCKOUT to value
“0” to access all levels of the menu
Temperature setpoints
revert to original value
after a certain time
period
Temporary setpoint option
selected
1. The thermostat needs to be in Permanent setpoint
mode for the new setpoint to be kept and memory
and used all the time
2. Go to the Set temperature menu.
3. The last prompt is setpoint type. Set it to
Permanent setpoint
Thermostat will not call
for heating
Wrong mode selected
Select heating mode
Thermostat in Unoccupied
mode
Select Override to force the thermostat Occupied
heating setpoint
Anticycle delay active
Wait, the anticycling period will end and the
equipment will start
Heating setpoint is satisfied
Raise the Heating setpoint
Heating lockout attained
1. Mode is locked out based on outside air
temperature
2. Change configuration parameter H Lock to value
120 °F ( 49 °C ) to by-pass lockout
Wiring error
1. Start the Fan by forcing the Fan ON mode
2. Put a jumper across terminals RH & W1. The
heating should come ON. If it does not, verify wiring
and check if a jumper is required between RC & RH
Thermostat will not call
for cooling
Wrong mode selected
Select cooling mode
Thermostat in Unoccupied
mode
Select Override to force the thermostat Occupied
cooling setpoint
Anticycle delay active
Wait, the anticycling period will end and the
equipment will start
Cooling setpoint is satisfied
Lower the cooling setpoint
Cooling lockout attained
1. Mode is locked out based on outside air
temperature
2. Change configuration parameter C Lock to value -
40 °F ( -40 °C ) to by-pass lockout
Wiring error
1. Start the Fan by forcing the Fan ON mode
2. Put a jumper across terminals RC & Y1. The
cooling should come ON. If it does not, verify wiring
The thermostat will not
turn on the fan
Wrong mode selected
1. Start the Fan by forcing the Fan ON mode
2. Put a jumper across terminals RC & G. The fan
should come ON. If it does not, verify wiring
Wiring error
Digital display shows
missing digits or erratic
segments
Defective display
Replace thermostat

Distech Controls RT Series Specifications

General

Brand	Distech Controls
Model	RT Series
Category	Thermostat
Language	English