User`s manual

Watlow EZ-ZONE™ RUI/Gateway • 21 • Appendix
Appendix
Troubleshooting
Indication Description Possible Cause(s) Corrective Action
No Display No display indication or LED
illumination
• Power to RUI (Remote User Interface)
is off
• Fuse open
• Breaker tripped
• Safety interlock switch open
• Separate system limit control acti-
vated
• Wiring error
• Incorrect voltage to controller
• Turn on power.
• Replace fuse.
• Reset breaker.
• Close interlock switch.
• Reset limit.
• Correct wiring issue.
• Apply correct voltage.
EZ-Key doesn’t work EZ-Key does not activate re-
quired function
• Keypad malfunction • Replace or repair the RUI.
[``no] upper display
[`dEu] lower display
The RUI (Remote User Inter-
face) will not communicate
with the controller at the
selected zone.
• Communications wired incorrectly
• Communications wires routed with
power wires
• Zone address set out of range
• RUI or controller defective
• Check and correct wiring.
• Check and correct wiring.
• Check zone range and address.
• Replace or repair RUI or controller.
[uAL;h]
Value is too large to be dis-
played (≥ 1000.0).
• Scaling is out of range • Check scaling.
• Call technical support.
[uAL;L]
Value is too small to be dis-
played (≤ -2000.0).
• Scaling is out of range • Check scaling.
• Call technical support.
A