Model reference
Carrier FB4C
HVAC
1 document11 error codes
Available documentation
Service Manual
- Residential Fan Coil Units Service and Maintenance Instructions33 pg
MyPros+ Max
Diagnose your Carrier FB4C.
- Step-by-step diagnostics from the service manual
- Test values, resistance specs, and wiring references
- Verified part numbers when replacement is needed
Start diagnosing
$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax
Error codes (11)
CodeMeaning
16System communication fault25Invalid motor / model selection26Invalid heater size27Invalid outdoor unit size36Heater output not sensed when energized37Heater output sensed on when not energized41Blower motor fault44Motor communication fault45Control board test fault46Brownout condition53Outdoor air temperature sensor faultRelated Carrier hvac models
75,000+ service documents · 20,000+ error codes · 100+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax