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Table 28. Potential unit issues and solutions (continued)
Problem
Excess dirt in unit
Microbial growth (mold)
Table 29. Compressor alarming
Diagnostic: Compressor (1-4) Discharge Pressure Sensor Failure (In Alarm)
Notification Class
HVAC Critical Alarm.
Diagnostic: Compressor (1-4) Discharge Pressure Sensor Failure (In Fault)
Notification Class
HVAC Critical Alarm.
PKG-SVX027C-EN
Missing filters Filter bypass
Standing water in drain pan
Action
Compressor will be locked
The Pressure sensor is
out and prevented from
calculated to be in fault
running until this
and the unit has locked
diagnostic is cleared.
out the compressor from
operation.
Action
Compressor will be locked
The Pressure sensor is
out and prevented from
reading either Above or
running until this sensor is
Below its minimum value,
in a normal state.
resulting in a Fault
Condition after 3 point
updates.
Possible Cause
Typical Causes
Reason
•
Sensor has lost its 5
Vdc Source Signal.
Verify that the sensor
has 5 Vdc.
•
Sensor is not wired
properly: Verify
wiring to the XM
Module.
•
XM Module is not
communicating.
Ensure that the XM
Module is up and
talking to the UC600.
•
System has no
charge: Verify that
the system has a
refrigerant charge.
•
Sensor has failed.
Typical Causes
Reason
•
Sensor has lost its 5
Vdc Source Signal.
Verify that the sensor
has 5 Vdc.
•
Sensor is not wired
properly: Verify
wiring to the XM
Module.
•
XM Module is not
communicating.
Ensure that the XM
Module is up and
talking to the UC600.
System has no
charge: Verify that
the system has a
refrigerant charge.
•
Sensor has failed.
D D i i a a g g n n o o s s t t i i c c s s
Remedy
Replace filters Reduce filter bypass
See "Standing water in drain pan" above
Reset Required
Manual Reset required
once the sensor is in a
Normal State. User must
toggle the Compressor
(1-4) Failure Reset.
Reset Required
None, fault clears once
sensor is in a normal
state.
77
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