Carrier PTV Installation, Start-Up And Service Instructions Manual page 53

Table 32 -- WSHP Troubleshooting (cont)
FAULT
Over/Under Voltage --
Code 7 (Auto Resetting)
Performance Monitor --
Code 8
FP1 and FP2 Thermistors
-- Code 9
No Fault Code Shown
Swapped Thermistor --
Code 9
Unit Short Cycles
Only Fan Runs
Only Compressor Runs
Unit Does Not Operate in
Cooling
Insufficient Capacity/
Not Cooling or Heating
Properly
HEATING
x
x
x
COOLING
X
POSSIBLE CAUSE
Under voltage
Over voltage
SOLUTION
Check power supply and 24 vac voltage before and during operation.
Check power supply wire size.
Check compressor starting.
Check 24 vac and unit transformer tap for correct power supply voltage.
Check power supply voltage and 24 vac before and during operation.
Check 24 vac and unit transformer tap for correct power supply voltage.
Check for poor airflow or overcharged unit.
Check for poor water flow or airflow.
X Swap FP1 and FP2 thermistors.
X Swap FP1 and FP2 thermistors.
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x x
x x
x x
x
x
x
x
x
x
x
Heating mode FP2>125 F
Cooling mode FP1>125 F OR
FP2<40 F
FP1 temperature is higher
than FP2 temperature.
FP2 temperature is higher
than FP1 temperature.
No compressor operation
Compressor overload
Control board
FP1 and FP2 swapped
Dirty air filter
Unit in 'Test Mode'
Unit selection
Compressor overload
Thermostat position
Unit locked out
Compressor overload
Thermostat wiring
Thermostat wiring
Fan motor relay
Fan motor
Reversing valve
Thermostat setup
Thermostat wiring
Dirty filter
Reduced or no airflow in heating
Reduced or no airflow in cooling
Leaky ductwork
Low refrigerant charge
Restricted metering device
Defective reversing valve
Thermostat improperly located
Unit undersized
Scaling in water heat exchanger
Inlet water too hot or cold
X
X
See Scroll Compressor Rotation section.
Check and replace if necessary.
Reset power and check operation.
Reverse position of thermistors.
Check and clean air filter.
Reset power or wait 20 minutes for auto exit.
Unit may be oversized for space. Check sizing for actual load of space.
Check and replace if necessary.
Ensure thermostat set for heating or cooling operation.
Check for lockout codes. Reset power.
Check compressor overload. Replace if necessary.
Check Y and W wiring at heat pump. Jumper Y and R for compressor
operation in Test mode.
Check G wiring at heat pump. Jumper G and R for fan operation.
Check Y and W wiring at heat pump. Jumper Y and R for compressor
operation in test mode.
Jumper G and R for fan operation. Check for line voltage across BR
contacts.
Check fan power enable relay operation (if present).
Check for line voltage at motor. Check capacitor.
Set for cooling demand and check 24 vac on RV coil and at control.
if RV is stuck, run high pressure up by reducing water flow and while
operating, engage and disengage RV coil voltage to push valve.
Check for 'O' RV setup not 'B'.
Check O wiring at heat pump. Jumper O and R for RV coil 'Click'.
Replace or clean.
Check for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
External static too high. Check blower performance per Tables 9-13.
Check for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
External static too high. Check blower performance per Tables 9-13.
Check supply and return air temperatures at the unit and at distant duct
registers if significantly different, duct leaks are present.
Check superheat and subcooling per Tables 20-23.
Check superheat and subcooling per Tables 20-23. Replace.
Set for cooling demand and check 24 vac on RV coil and at control.
If RV is stuck, run high pressure up by reducing water flow and while
operating, engage and disengage RV coil voltage to push valve.
Check location and for air drafts behind thermostat.
Recheck loads and sizing check sensible cooling load and heat pump
capacity.
Perform condenser cleaning.
Check load, loop sizing, loop backfill, ground moisture.
LEGEND
LED -- Light-Emitting Diode
RV -- Reversing Valve
TXV -- Thermostatic Expansion Valve
53