Carrier AQUAZONE 50PSW036-360 Installation And Service Instructions Manual page 21

FAULT HEATING
Main Power Problems
HP Fault — Code 2
High Pressure
LP/LOC Fault — Code 3
Low Pressure/Loss of
Charge
FP1 Fault — Code 4
Source Water Freeze
Protection
FP2 Fault — Code 5
Load Coil Freeze
Protection
Over/Under Voltage —
Code 7
(Auto Resetting)
Performance Monitor —
Code 8
No Fault Code Shown
Unit Short Cycles
Unit Does Not Operate in
Cooling
Insufficient Capacity/
Not Cooling or Heating
Properly
High Head Pressure
Low Suction Pressure
LEGEND
FP — Freeze Protection
HP — High Pressure
LED — Light-Emitting Diode
LOC — Loss of Charge
LP — Low Pressure
RV — Reversing Valve
Table 13 — Troubleshooting
COOLING POSSIBLE CAUSE
X X Green Status LED Off
X Reduced or no water flow in
cooling
X Water temperature out of range
in cooling
X X Overcharged with refrigerant
X X Bad HP switch
X X Insufficient charge
X Compressor pump down at
start-up
X Reduced or no water flow in
heating
X Inadequate antifreeze level
X Improper freeze protect setting
(–1.1 C vs –12.2 C)
X Water temperature out of range Bring water temperature within design parameters.
X X Bad thermistor
X Reduced or no water flow in
heating
X Improper freeze protect setting
(–1.1 C vs –12.2 C)
X Water temperature out of range Bring water temperature within design parameters.
X X Bad thermistor
X X Under voltage
X X Over voltage
X Heating mode FP2>51.7 C
X Cooling mode FP1>51.7 C OR
FP2< 4.4 C
X X No compressor operation
X X Compressor overload
X X Control board
X X Unit in Test mode
X X Unit selection
X X Compressor overload
X Reversing valve
X Thermostat setup
X Thermostat wiring
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 Perform scaling check and clean if necessary.
X X Inlet water too hot or cold
X Scaling in water heat exchanger Perform scaling check and clean if necessary.
X X Unit overcharged
X X Non-condensables in system
X X Restricted metering device
X Reduced water flow in heating
X Water temperature out of range Bring water temperature within design parameters.
Check line voltage circuit breaker and disconnect.
Check for line voltage between L1 and L2 on the contactor.
Check for 24-vac between R and C on controller.
Check primary/secondary voltage on transformer.
Check pump operation or valve operation/setting.
Check water flow adjust to proper flow rate.
Bring water temperature within design parameters.
Check superheat/subcooling vs. typical operating condition.
Check switch continuity and operation. Replace.
Check for refrigerant leaks.
Check charge and start-up water flow.
Check pump operation or water valve operation/setting.
Plugged strainer or filter. Clean or replace.
Check water flow adjust to proper flow rate.
Check antifreeze density with hydrometer.
Clip JW3 jumper for antifreeze (–12.2 C) use.
Check temperature and impedance correlation.
Check pump operation or water valve operation/setting.
Plugged strainer or filter. Clean or replace.
Check water flow adjust to proper flow rate.
Clip JW3 jumper for antifreeze (–12.2 C) use.
Check temperature and impedance correlation.
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 overcharged unit.
Check for poor water flow or airflow.
See scroll compressor rotation section.
Check and replace if necessary.
Reset power and check operation.
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.
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 operat-
ing 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.
Check superheat and subcooling.
Check superheat and subcooling. Replace.
Perform RV touch test.
Check location and for air drafts behind thermostat.
Recheck loads and sizing. Check sensible cooling load and heat pump
capacity.
Check load, loop sizing, loop backfill, ground moisture.
Check superheat and subcooling. Reweigh in charge.
Vacuum system and reweigh in charge.
Check superheat and subcooling. Replace.
Check pump operation or water valve operation/setting.
Plugged strainer or filter. Clean or replace.
Check water flow adjust to proper flow rate.
21
SOLUTION