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Heat Pump Troubleshooting
General Approach to Fault
Isolation
Trane manufactures heat pump with embedded fault
detection and diagnostics in each module's controller that
offers continuous dedicated monitoring to record and report
faults as they occur in real time allowing repairs to be
performed in a timely manner.
Various faults occurring in a building's HVAC system can
lead to unnecessary energy consumption and poor thermal
comfort for a building's occupants. Fault detection and
isolation plays a significant role in monitoring, maintaining,
Table 11. Interface panel diagnostic code key
ALARM
c.pCOe UI1 sensor failure
c.pCOe UI2 sensor failure
c.pCOe UI9 sensor failure
c.pCOe UI10 sensor failure
c.pCOe Offline Alarm
c.pCOe wrong config Alarm
UI1 sensor failure
UI2 sensor failure
UI3 sensor failure
UI3 sensor failure
UI4 sensor failure
UI4 sensor failure
UI5 sensor failure
UI6 sensor failure
UI7 sensor failure
UI8 sensor failure
UI11 sensor failure
UI12 sensor failure
Compressor 1 overload
Compressor 2 overload
EVD offline
EVD System Alarm
EVD Driver A Alarm
54
and repairing heat pump to improve operator safety and
minimize operating costs.
Fault detection is recognizing that a problem has occurred,
even if the root cause is not yet known. Fault isolation is the
process of reducing potential causes to determine the most
likely source of heat pump failure.
Controller Diagnostic Codes
The following table assists in explaining the alarm codes
that appear in the remote interface panel in the event of an
alarm. The alarm history is accessed by pressing the alarm
log key.
RESET
Auto
Shuts down Circuit 2 if Low Pressure sensor selected for Suction Pressure Alarm
Auto
Shuts down Circuit 2
Auto
Warning
Auto
Warning
Auto
Shuts down Circuit 2
Auto
Warning
Auto
Shuts down circuit 1 if Low Pressure sensor selected for Suction Pressure Alarm
Auto
Shuts down Circuit 1
Auto
Shuts down local cooling control if Module is in Stand-alone Mode and
respective Entering / Leaving Water sensor selected for Temperature Control
Auto
Shuts down local heating control if Module is in Stand-alone Mode and
respective Entering / Leaving Water sensor selected for Temperature Control
Auto
Locks out module
Auto
Warning
Auto
Warning
Auto
Warning
Auto
Modules switch into Stand-alone Mode if both respective Cooling / Heating Mode
selected and respective Entering / Leaving Water sensor selected for
Temperature Control
Auto
Modules switch into Stand-alone Mode if both respective Cooling / Heating Mode
selected and respective Entering / Leaving Water sensor selected for
Temperature Control
Auto
Control panel heating / cooling control is disabled
Auto
Warning
User
Shutdown compressor 1
User
Shutdown compressor 2
Auto
Warning
Auto
Warning
Auto
Warning
ACTION
ARTC-SVX006A-EN
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