Carrier AQUAZONE 50PSH Installation And Service Instructions Manual page 56

FAULT HEATING
Condensate Fault —
Code 6
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
LEGEND
LED — Light-Emitting Diode
RV — Reversing Valve
TXV — Thermostatic Expansion Valve
Table 39 — WSHP Troubleshooting (cont)
COOLING POSSIBLE CAUSE
X X Blocked drain
X X Improper trap
X Poor drainage
X Moisture on sensor
X X Under voltage
X X Over voltage
X Heating mode FP2>125 F
X Cooling mode FP1>125 F OR
FP2< 40 F
X FP1 temperature is higher
than FP2 temperature.
X FP2 temperature is higher
than FP1 temperature.
X X No compressor operation
X X Compressor overload
X X Control board
X X FP1 and FP2 swapped
X X Dirty air filter
X X Unit in 'Test Mode'
X X Unit selection
X X Compressor overload
X X Thermostat position
X X Unit locked out
X X Compressor overload
X X Thermostat wiring
X X Thermostat wiring
X X Fan motor relay
X X Fan motor
X Reversing valve
X Thermostat setup
X Thermostat wiring
X X Dirty filter
X Reduced or no airflow in
heating
X Reduced or no airflow in
cooling
X X Leaky ductwork
X X Low refrigerant charge
X X Restricted metering device
X Defective reversing valve
X X Thermostat improperly located
X X Unit undersized
X X Scaling in water heat exchanger
X X Inlet water too hot or cold
Check for blockage and clean drain.
Check trap dimensions and location ahead of vent.
Check for piping slope away from unit.
Check slope of unit toward outlet.
Poor venting. Check vent location.
Check for moisture shorting to air coil.
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.
Swap FP1 and FP2 thermistors.
Swap FP1 and FP2 thermistors.
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 11-13.
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 11-13.
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 20-30.
Check superheat and subcooling per Tables 20-30. 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.
56
SOLUTION