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BCX-SVX002A-EN
Table 43. Troubleshooting recommendations (continued)
Symptom Probable Cause Recommended Action
Low refrigerant coil capacity Incorrect airflow Check fan operating condition.
Expansion valve is not operating properly or is sized
incorrectly
Check sensing bulb temperature.
Verify valve operation.
Verify proper valve size.
Incorrect refrigerant charge Verify refrigerant charge and adjust if necessary.
Condensing unit failure Verify condensing unit operation.
Coil is piped incorrectly Verify coil piping (see “Piping and Connections,” p. 53.)
Clogged refrigerant line filter Change filter core.
Failure of suction/liquid line components Verify component operation
Dirty fin surface Clean the fin surface.
Do not use steam to clean refrigerant coils.
Fin frosting Verify defrost cycle operation.
Verify frostat operation.
Verify refrigerant charge.
Drain pan is overflowing Plugged drain line Clean drain line
Unit not level Level unit
Improper trap design Design trap per unit installation instructions
Standing water in drain pan Improper trap design Design trap per unit installation instructions
Unit not level Level unit
Plugged drain line Clean drain line
Wet interior Coil face velocity too high Reduce fan speed
Improper trap design Design trap per unit installation instructions
Drain pan leaks/overflows Repair leaks
Condensation on surfaces Insulate surfaces
Excess dirt in unit Missing filters Replace filters
Filter bypass Reduce filter bypass by ensuring all blockoffs are in place.
Microbial growth (mold)
inside air handler
Standing water in drain pan See "Standing water in drain pan" above
Wireless Zone Sensors (WZS)
The receiver for all models has four LEDs: LED1, LED2,
LED3, and LED5. The following figure shows their
locations.
Note: To view LEDs on a flush mount receiver on a fan coil
unit, the front panel of the unit must be removed.
Diagnostics and Troubleshooting
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