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Manafacture: Carrier File size: 2.05 mb File name: Language of manual:

Clock gas meter for input. If too low, increase manifold pressure, or replace with correct orifices. Unit undersized for application Replace with proper unit — or add additional unit Restricted airflow Clean or replace filter — or remove any restriction. Blower speed too low Use faster speed tap Check temperature rise. Limit switch cycles main burners Dirty air filters — clean or replace. Registers closed, restricted ductwork — open or remove restriction. Check temperature rise. Check heat anticipator setting on thermostat — readjust. Poor flame characteristics. Incomplete combustion results in: Aldehyde odors, CO, sooting flame — floating flame Check all screws around flue outlets and burner compartment — tighten. LACK OF COMBUSTION AIR. Cracked heat exchanger — replace. Overfired furnace — reduce input, or change orifices. Check vent for restriction — clean as required Check orifice for burner alignment. GR — Ground LP — Liquid Propane 21 Table 12 — Cooling Troubleshooting Chart SYMPTOM CAUSE REMEDY Compressor and condenser fan will not start. Power failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer or control relay Replace component. Insufficient line voltage Determine cause and correct. Incorrect or faulty wiring Check wiring diagram and rewire correctly. Thermostat setting too high Lower thermostat setting below room temperature Compressor will not start but condenser fan runs. Faulty wiring or loose connections in compressor circuit Check wiring and repair or replace. Compressor motor burner out, seized or internal overload open Determine cause. Replace compresor. Defective run/start capacitor, overload, start relay Determine cause and replace. One leg of 3-phase power dead Replace fuse or reset circuit breaker. Determine cause. Compressor cycles (other than normally satisfying thermostat). Refrigerant overcharge or undercharge Blow refrigerant, evacuate system and recharge to nameplate. Defective compressor Replace and determine cause Insufficient line voltage Determine cause and correct Blocked condenser Determine cause and correct. Defective run/start capacitor, overload or start relay Determine cause and replace. Defective thermostat Replace thermostat. Faulty condenser fan motor or capacitor Replace. Restriction in refrigerant system Locate restriction and remove. Compressor operates continuously. Dirty air filter Replace filter. Unit undersized for load Decrease load or increase unit size. Thermostat set too low Reset thermostat. Low refrigerant charge Locate leak, repair and recharge. Leaking valves in compressor Replace compressor. Air in system Blow refrigerant, evacuate system and recharge. Condenser coil dirty or restricted Clean coil or remove restriction. Excessive head pressure. Dirty air filter Replace filter. Dirty condenser coil Clean coil. Refrigerant overcharged Purge excess refrigerant. Air in system Blow refrigerant, evacuate system and recharge. Condenser air restricted or air short-cycling Determine cause and correct. Head pressure too low. Low refrigerant charge Check for leaks, repair and recharge. Compressor valves leaking Replace compressor Restriction in liquid tube Remove restriction. Excessive suction pressure. High heat load Check for source and eliminate. Compressor valves leaking Replace compressor Refrigerant overcharged Purge excess refrigerant. Suction pressure too low. Dirty air filter Replace filter Low refrigerant charge Check for leaks, repair and recharge. Metering device or low side restricted Remove source of restriction. Insufficient evaporator airflow Increase air quantity. Check filter — replace if necessary. Temperature too low in conditioned area Reset thermostat. Outdoor ambient below 55 F Install low-ambient kit. Field-installed filter-drier restricted Replace. 22 Air Filter A CAUTION Never operate the unit without a suitable air filter in the return-air duct system. Always replace the filter with the same dimensional size and type as originally installed. See Table 1 for recommended filter sizes. Inspect air filter(s) at least once each month and replace (disposable-type) or clean (cleanable-type) at least twice during each heating and cooling season or whenever the filter(s) becomes clogged with dust and lint. Replace filters with the same dimensional size and type as originally provided, when necessary. Unit Top Removal A CAUTION Condenser fan and motor are fastened to the unit top. When removing the top, use extreme care to not pull the fan motor leads loose. NOTE: When performing maintenance or service procedures that require removal of the unit top, be sure to perform all of the routine maintenance procedures that require top removal, including: inspection of the heat exchanger area, coil inspection and cleaning, and condensate...

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