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® 2018 Valco Companies, Inc.
APPENDIX 4 - Troubleshooting
1. Power/Display
No Display.
1.1a
Verify the controller has power by turning a toggle switch to ON. If a light comes on,
try step 1.1b.
If no light, you probably do not have power coming to the controller. Check 1.2a.
1.1b
Display is too light. Press DISPLAY DARK on controller keypad for several seconds.
1.1c
A row of dark boxes means that no software exists on the HMI display board. Power
down and insert a SD card with a current update file on it. Obtain from
VAL-CO
®
Service. Power up, wait 20 minute for update to complete. Power down reinstall
operating SD card. Power up.
1.1d
Replace HMI display board
No Power.
1.2a
Circuit breakers are tripped or turned off.
1.2b
Fuse on the controller power supply is blown. Replace
with equivalent.
1.2c
Terminal connections on power supply are not tight.
Display light keeps
turning off.
1.3a
Normal operation. It’s programmed to turn off one minute after you’re done using the
keypad. This will add years to its useful life and save electricity.
2. Sensor Readings
Temperature reading is
N/A or
–412
°
.
2.1a
Air sensor is disconnected or wire is cut. Check continuity in cable/sensor. Resistance
through the cable and sensor should be about 1100 ohms. If higher check for cable,
splice, or sensor damage.
2.1b
Temperature is beyond the operating range (Outside –60
°
F to 120
°
F, Inside 30
°
F
to
130
°
F).
2.1c
Sensor is defective. Connect new sensor.
2.1d
If readings are N/A, verify that sensor is installed by checking the List Control
Devices menu.
2.1e
Replace Interconnect board
Temperature reading is
wrong.
2.2a
Check temperature at sensor with an accurate thermometer.
2.2b
Wrong wire gauge input. Read wire gauge from wire and input in Sensor Calibration
& Setting menu for all air sensors.
2.2c
Wrong cable length input. Check cable length to each sensor and input to Sensor Cali-
bration & Setting menu.
2.2d
Mis-calibrated sensor. Adjust by adding/subtracting cable length. Add about 7 feet
(varies by wire gauge) to drop the reading by 0.1 degree F. Subtract length to increase
reading. Offset in degrees may be entered if software version 2.13 or higher.
2.2e
Sensors mis-numbered in programming. Verify position of sensors by dipping in water
then swinging rapidly to cool them. Within 20 seconds, you should see a noticeably
cooler reading for that sensor (Current Status menu). If sensors are misnumbered, a
different sensor reading will drop. To correct, you must rewire the sensors in question
to the proper input channels.
2.2f
Sensor or connection splice is bad. Cut sensor above splice. Cut off splice. Reconnect
and check to see if sensor is working. If not, replace sensor.
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