34
INTER 2V4SA, rev.02
INTER 2V4SA
13.
Troubleshooting
PROBLEM
CAUSE
SOLUTION
The display doesn't work. The circuit breaker on the ser-
vice panel is off or tripped.
Reset the circuit breaker.
The wiring is incorrect.
Fix the wiring.
The input fuse is open.
Replace the fuse.
The voltage selector switch is in
the wrong position.
Set the switch to the correct position.
The display board interconnect
cable is unplugged from the
power supply board.
Plug the cable.
The display shows the
letter "P"
Probe # 1 not properly con-
nected
Connect probe #1 correctly
The Defective Probe Pilot
Light is on.
One or more probes are defec-
tive.
Follow the procedure described in
DEFECTIVE PROBES to identify and
replace the defective probe.
The display shows sud-
den variations in room
temperature.
A variation in resistance is
induced on a probe.
Make sure the probes are dry and move
them away from drafts and sources of
radiant heating.
There is electrical noise near an
extended probe cable.
Do not run probe cables next to other
power cables. When crossing other
power cables, cross at 90°.
Stage 1 or 2 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 and 2 COMM is sup-
plied by line L1.
The Stage's fuse is open.
Replace the fuse.
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.
Adjust the minimum speed to a higher
value.
The fan motor is defective.
Check if motor is defective by con-
necting it to an alternate power supply.
Replace the motor if it still doesn't
operate.
Stage 1 or 2 fans run
continuously at full
speed.
The wiring is incorrect.
Fix the wiring.
The ambient temperature is
above the set point.
Adjust the set point to the desired
value.
7
INTER 2V4SA, rev.02
INTER 2V4SA
3.3. Controller Status LEDS
LED
Meaning
VARIABLE STAGE 1
Turns on when variable fan stage 1 fans is active.
VARIABLE STAGE 2
Turns on when variable fan stage 2 fans is active.
STAGES 3-6
Turns on when fan stage 3-6 is active.
MIST
Turns on when the mist stage is active.
HEATER 1
Turns on when heating stage 1 is active.
HEATER 2
Turns on when heating stage 2 is active.
RH COMPENSATION
Turns on when a RH compensation function is on.
TEMP RAMP
Turns on when the temperature ramp is enabled.
MIN SPEED RAMP
Turns on when the minimum speed ramp is enabled
PROBE DEFECT
Turns on when a probe is defective.
ALARM
Turns on when an alarm condition is detected.
