Temperature Sensor Failure; Demand Configuration Fault; Air Handler Fault Led - Solid On; Air Handler Fault Led - 2 Flash - Trane ACONT900AC43UA Service Manual

Temperature sensor failure

Comfort Control = No Error Code Displayed
User Interface = TS1 SHORT
Air Handler Fault LED = No Fault Reported
or
Furnace Fault LED = No Fault Reported
Problem Description
• Not active for Phase 1 or Phase 2 communicating
systems
Temperature sensor failure
Comfort Control = No Error Code Displayed
User Interface = TS1 OPEN
Air Handler Fault LED = No Fault Reported
or
Furnace Fault LED = No Fault Reported
Problem Description
• Not active for Phase 1 or Phase 2 communicating
systems
Temperature sensor failure
Comfort Control = No Error Code Displayed
User Interface = TS2 SHORT
Air Handler Fault LED = No Fault Reported
or
Furnace Fault LED = No Fault Reported
Problem Description
• Not active for Phase 1 or Phase 2 communicating
systems
Temperature sensor failure
Comfort Control = No Error Code Displayed
User Interface = TS2 OPEN
Air Handler Fault LED = No Fault Reported
or
Furnace Fault LED = No Fault Reported
Problem Description
• Not active for Phase 1 or Phase 2 communicating
systems
Alert Code Response

Demand configuration fault

Comfort Control = No Error Code Displayed
User Interface = HT CFG ERR
Air Handler Fault LED = 9 Fault
Problem Description
• Number of electric heat stages originally discovered
by the heat detection circuit is different than the
number of heat stages reporting
Possible Causes/Solutions
• Open TCO or heater contactor circuit
• Number of electric heat banks has changed since
start-up
- If electric heaters are being replaced with a different
number of stages, change ISU176 on comfort control
to new value and access user interface on air handler
and force heat re-sense
Air handler fault LED

Air handler fault LED - Solid ON

Comfort Control:
- Err 18
- No Error Code Displayed

Air handler fault LED - 2 Flash

Comfort Control:
- Err 114
Comfort Control:
- No Error Code Displayed
User Interface:
- PM MEM ERR
- PM MISSING
- ID MTR ERR
User Interface:
- PM UNIT ERR
- CAP MISMATCH
- PM DATA ERR
R - A 23