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TROUBLESHOOTING GUIDE
PROBLEM
CAUSE SOLUTION
The display doesn't work.
The circuit breaker on the service panel is off or tripped.
Reset the circuit breaker.
The wiring is incorrect.
Fix the wiring.
Replace the fuse.
The input fuse is open.
The voltage selector switch is in the wrong position.
Set the switch to the correct position.
Plug the cable.
The display board interconnect cable is unplugged from the power supply board.
The display shows the letter "P"
Probe # 1 is improperly connected.
The Defective
Probe Pilot
Light is on.
One or more probes are defective.
Fix the probe's connection.
Follow the procedure described in DEFECTIVE PROBES to identify and replace the defective probe.
The display shows sudden variations in the room temperature.
A variation in resistance is induced on a probe.
There is electrical noise near an extended probe cable.
Make sure the probes are dry and move them away from drafts and sources of radiant heating.
Do not run probe cables next to other power cables. When crossing other power cables, cross at 90 o
.
TC5-1N5FAB.rev.05
57
TC5-1N5FAB
PROBLEM
CAUSE SOLUTION
Stage 1 fans are not running.
The wiring is incorrect.
Correct the wiring. In particular, make sure two different lines are connected to each motor: line L1 modulated by the controller should be combined with another line (N for 115V or L2 for 230V) to activate the motor. Also, be sure the Stage 1 COMMON is supplied by line L1.
Replace the fuse.
The Stage's fuse is open.
The display board interconnect cable is not plugged into the power supply board properly.
Make sure the cable is firmly plugged in with the tabs in place.
The minimum speed is too low.
The fan motor is defective.
Adjust the minimum speed to a higher value.
Check if motor is defective by connecting it to an alternate power supply. Replace the motor if it still doesn't operate.
58
TC5-1N5FAB.rev.05
TC5-1N5FAB
PROBLEM
CAUSE SOLUTION
Stage 1 fans run continuously at full speed.
The wiring is incorrect.
The ambient temperature is above the set point.
Fix the wiring.
Adjust the set point to the desired value.
Stage 1 fans run erratically.
The selected motor curve is inappropriate.
The differential is too small.
Select an appropriate motor curve.
Adjust the differential to a higher value.
The time on or time off is too short.
Adjust the time on or time off to a higher value.
Stage 1 fans do not stop running when the controller is operating in minimum ventilation cycle.
Time off is set to zero.
Set time off to a value other than zero.
The wiring is incorrect.
Correct the wiring. In particular, make sure two different lines are connected to each motor: line L1 modulated by the controller should be combined with another line (N for 115V or
L2 for 230V) to activate the motor.
Also, be sure the stage 1
COMMON is supplied by line L1.
Humidity compensation is activated and relative humidity exceeds set point.
Adjust set point or deactivate compensation as required.
TC5-1N5FAB.rev.05
59
TC5-1N5FAB
PROBLEME CAUSE SOLUTION
One of the other stages is not operating.
The Stage's fuse is open.
The display board interconnect cable is not plugged into the power supply board properly.
The wiring is incorrect.
Replace the fuse.
Make sure the cable is firmly plugged in with the tabs in place.
Correct the wiring. In particular, make sure two different lines are connected to each motor: line L1 modulated by the controller should be combined with another line (N for 115V or L2 for 230V) to activate the motor or heating unit. Also, make sure the
Stage COMMON is supplied by line L1.
The fan motor or heating unit is defective.
Verify if the motor or heating unit is defective by connecting it to an alternate power supply.
Replace the motor or heating unit If it still is not operating.
The controller is defective.
Listen to see if there is a clicking sound when the Stage's pilot light turns on. If there is no clicking sound, contact your distributor to repair the controller.
60
TC5-1N5FAB.rev.05
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