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Table 11 – Troubleshooting Guide -- Cooling or Heat Pump Heating Mode
SYMPTOM CAUSE REMEDY
Compressorand Outdoorfanwillnot
start.
Power F ailure Call power company.
Fuse blown or circuit breaker tripped Replacefuseorresetcircuitbreaker.
Defective thermostat, contactor, transformer, or control
relay
Replace component.
Insufficient line voltage Determine causeand correct.
Incorrect or faulty wiring Check wiring diagram and rewire correctly .
Thermostat setting too high Lower thermostat s etting below room temperature.
Compressor willnot start but Outdoor
fan runs.
Faultywiringor loose connectionsincompressorcircuit Check wiring and repair or replace.
Compressor motor burnedout, seized, or internal over-
loadopen
Determine cause Replace compressor.
Defective run/start capacitor, overload, startrelay Determine causean d replace.
Onelegof3---phasepowerdead
Replacef useor reset circuitbreaker. Determine
cause.
Three---phase scroll compressor makes
excessive noise, and there may
be alow pressure differential.
Scroll compressor is rotating in the wrongdirection
Correct the direction ofrotation by reversingthe
3---phase power leadsto the unit.
Compressor cycles (other thannormally
satisfying thermostat).
Refrigerantoverchargeor undercharge
Recoverrefrigerant, evacuate system, andrecharge
to capacities shown on nameplate.
Defective compressor Replace and determine cause.
Insufficient line voltage Determine causeand correct.
Blocked Outdoor Determinecause andcorrect.
Defective run/startcapacitor, overload or startrel ay Determine cause andr eplace.
Defectivethermostat Replace thermostat.
Faulty Outdoor---fan motor or capacitor Replace.
Damaged reversing valve Determinecauseand correct
Restriction in refrigerantsystem Locate restriction andremove.
Compressor operates continuously.
Dirty airfilter Replace filter.
Unitundersizedfor load Decrease load or increase unit size.
Thermostat set too low Reset thermostat.
Low refrigerantcharge Locate leak,repair, andrecharge.
Mechanical damage in compressor. Replace compressor.
Air in system Recoverr efrigerant, evacuate system,and recharge.
Frostedcoilwithincorrect defrostoperation
Check defrost time settings, Reset as necessary
Check defrost temperature switch, Replace as nec-
essary
Outdoor coil dirty or restricted Clean coil or remove restriction .
Excessive head pressure.
Dirty airfilter Replace filter.
Dirty Indoor or Outdoor coil Clean coil.
Refrigerant overcharged Recover excess refrigerant.
Air in system Recoverr efrigerant, evacuate system,and recharge.
Indoor or Outdoor air restricted or air short---cycling Determinecauseand correct.
Head pressure too low.
Low refrigerantcharge Check for leaks,repair, andrecharge.
Compressor IPR leaking Replace compressor.
Restrictioninliquidtube Remove restriction.
Excessive suction pressure.
High heatl oad Checkfor sourceand eliminate.
Compressor IPR leaking Replace compressor.
Refrigerant overcharged Recover excess refrigerant.
Reversing valve hungup or leakinginternally Replace valve
Suction pressure too low.
Dirty airfilter Replace Filter.
Low refrigerantcharge Check for leaks,repair, andrecharge.
Metering device or low si d e restricted Remove source of restriction.
Insufficient Indoor airflow
Increase air quantity. Check filter — replace if neces-
sary.
Temperature too low in conditioned area Reset thermostat.
Outdoor ambientbelow 55°F (12.8°C) Install low---ambient kit.
Field---installed filter---drier restricted Replace.
(Heat) Outdoor coil frosted
Move timer on control board to 30 minutes between
defrost cycles
Compressor runs but outdoor fan does
not
NC (normally closed)contacts on defrostboard open
Check condition of relay on board Replaceif neces-
sary
48EZ --A