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