Carrier GT-PX Split Series Installation, Operation & Maintenance Instructions Manual

R e s i d e n t i a l S p l i t - 6 0 H z R 2 2 & R 4 1 0 AR e v. : 5 J u n e , 2 0 0 846 W a t e r- S o u r c e H e a t i n g a n d C o o l i n g S y s t e m sFault Htg Clg Possible Cause SolutionMain power Problems X X Green Status LED Off Check Line Voltage circuit breaker and disconnectCheck for line voltage between L1 and L2 on the contactorCheck for 24VAC between R and C on CXM/DXMCheck primary/secondary voltage on transformerHP Fault-Code 2 X Reduced or no water flow Check pump operation or valve operation/settingHigh pressure in cooling Check water flow adjust to proper flow rateX Water Temperature out of range incooling Bring water temp within design parametersX Reduced or no Air flow Check for dirty air filter and clean or replacein heating Check fan motor operation and airflow restrictionsDirty Air Coil- construction dust etc.Too high of external static. Check static vs blower tableX Air Temperature out of range inheating Bring return air temp within design parametersX X Overcharged with refrigerant Check superheat/subcooling vs typical operating conditiontableX X Bad HP Switch Check switch continuity and operation. ReplaceLP/LOC Fault-Code 3 X X Insufficient charge Check for refrigerant leaksLow Pressure/Loss of Charge X Compressor pump down at start-up Check charge and start-up water flowFP1 Fault - Code 4 X Reduced or no water flow Check pump operation or water valve operation/settingWater Coil lowtemperature limit in heating Plugged strainer or filter. Clean or replace.Check water flow adjust to proper flow rateX Inadequate anti-freeze level Check antifreeze density with hydrometerX Improper temperature limit setting(30°F vs 10°F [-1°C vs -12°C]) Clip JW3 jumper for antifreeze (10°F [-12°C]) useX Water Temperature out of range Bring water temp within design parametersX X Bad thermistor Check temp and impedance correlation per chartFP2 fault - Code 5 X Reduced or no Air flow Check for dirty air filter and clean or replaceAir Coil lowtemperature limitin cooling Check fan motor operation and airflow restrictionsToo high of external static. Check static vs blower tableX Air Temperature out of range Too much cold vent air? Bring entering air temp withindesign parametersX Improper temperature limit setting(30°F vs 10°F [-1°C vs -12°C]) Normal airside applications will require 30°F [-1°C] onlyX X Bad thermistor Check temp and impedance correlation per chartCondensate Fault-Code 6 X X Blocked Drain Check for blockage and clean drainX X Improper trap Check trap dimensions and location ahead of ventX Poor Drainage Check for piping slope away from unitCheck slope of unit toward outletPoor venting. Check vent locationX Moisture on sensor Check for moisture shorting to air coilOver/Under Voltage-Code 7 X X Under Voltage Check power supply and 24VAC voltage before and duringoperation.(Auto resetting) Check power supply wire sizeCheck compressor starting. Need hard start kit?Check 24VAC and unit transformer tap for correct powersupply voltageX X Over Voltage Check power supply voltage and 24VAC before and duringoperation.Check 24VAC and unit transformer tap for correct powersupply voltageUnit PerformanceSentinel-Code 8 X Heating mode FP2>125°F [52°C] Check for poor air flow or overcharged unit.X Cooling Mode FP1>125°F [52°C]OR FP2< 40ϒF [4ϒC] Check for poor water flow, or air flowNo Fault Code Shown X X No compressor operation See "Only fan operates"X X Compressor Overload Check and Replace if necessaryX X Control board Reset power and check operationUnit Short Cycles X X Dirty Air Filter Check and Clean air filterX X Unit in "Test Mode" Reset power or wait 20 minutes for auto exit.X X Unit selection Unit may be oversized for space. Check sizing for actualload of space.X X Compressor Overload Check and Replace if necessaryOnly Fan Runs X X Thermostat position Insure thermostat set for heating or cooling operationX X Unit locked out Check for lockout codes. Reset power.X X Compressor Overload Check compressor overload. Replace if necessary.X X Thermostat wiring Check thermostat wiring at heat pump. Jumper Y and Rfor compressor operation in test mode.Functional Troubleshooting