Heat Pump Troubleshooting; General Approach To Fault Isolation; Controller Diagnostic Codes - Trane Thermafit AXM Installation, Operation And Maintenance Manual

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 14. Interface panel diagnostic code key
Alarm
UI1 sensor failure
UI2 sensor failure
UI3 sensor failure
UI4 sensor failure
UI5 sensor failure
UI7 sensor failure
UI8 sensor failure
UI9 sensor failure
UI10 sensor failure
UI11 sensor failure
cpCOe #1 UI1 sensor failure
cpCOe #1 UI2 sensor failure
cpCOe #1 Offline Alarm
cpCOe #1 wrong config Alarm
cpCOe #2 UI1 sensor failure
cpCOe #2 UI2 sensor failure
cpCOe #2 UI7 sensor failure
cpCOe #2 UI8 sensor failure
cpCOe #2 Offline Alarm
cpCOe #2 wrong config Alarm
Compressor 1 External Fault
CoreSense 1 Warning
CoreSense 1 Fault
60
and repairing heat pump components 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.
Type
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
Auto Reset
User Reset
Action
Shuts down Circuit 1 (a)
Shuts down Circuit 1
Shuts down local cooling control
Shuts down local heating control
Locks out module
Warning
Warning
Locks out module
Warning
Warning
Shuts down Circuit 2 (a)
Shuts down Circuit 2
Control panel heating/cooling control is disabled
Warning
Warning
Warning
Warning
Modules switch into Stand-alone Mode
Modules switch into Stand-alone Mode
Switches from Remote SP to Local if used
Switches from Remote SP to Local if used
Modules switch into Stand-alone Mode
Warning
Shuts down compressor 1
Warning
Shuts down compressor 1
(b)
(b)
(c)
(c)
(c)
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