Carrier AQUAZONE 50PCH Installation And Service Instructions Manual page 41

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
Water Freeze Protection
FP2 Fault — Code 5
Air Coil Freeze
Protection
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
Unit Short Cycles
Only Fan Runs
LEGEND
RV — Reversing Valve
Table 32 — 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 Reduced or no airflow in heat-
ing
X Air temperature out of range in
heating
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 set-
ting (30F vs 10F)
X Water temperature out of
range
X X Bad thermistor
X Reduced or no airflow in cool-
ing
X Air temperature out of range
X Improper freeze protect set-
ting (30F vs 10F)
X X Bad thermistor
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 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
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 for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
Dirty air coil — construction dust etc.
External static too high. Check Tables 8-10.
Bring return-air temperature within design parameters.
Check superheat/subcooling vs typical operating condition Tables 15-25.
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 JW2 jumper for antifreeze (10F) use.
Bring water temperature within design parameters.
Check temperature and impedance correlation.
Check for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
External static too high. Check Tables 8-10.
Too much cold vent air. Bring entering-air temperature within design
parameters.
Normal airside applications will require 30 F only.
Check temperature and impedance correlation.
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 on page 28.
Check and replace if necessary.
Reset power and check operation.
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.
41
SOLUTION