Table 29 — Troubleshooting

FAULT

HEATING

COOLING

POSSIBLE CAUSE

SOLUTION

Main Power Problems

X

X

Green Status LED Off

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.

HP Fault — Code 2

 

X

Reduced or no water flow in

Check pump operation or valve operation/setting.

High Pressure

 

 

cooling

 

 

 

Check water flow adjust to proper flow rate.

 

 

 

 

 

 

X

Water temperature out of

Bring water temperature within design parameters.

 

 

 

range in cooling

 

 

X

 

Reduced or no airflow in heat-

Check for dirty air filter and clean or replace.

 

 

 

ing

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

Dirty air coil — construction dust etc.

 

 

 

 

External static too high. Check Tables 8-11.

 

X

 

Air temperature out of range in

Bring return-air temperature within design parameters.

 

 

 

heating

 

 

X

X

Overcharged with refrigerant

Check superheat/subcooling vs typical operating condition Tables 16-22.

 

X

X

Bad HP switch

Check switch continuity and operation. Replace.

LP/LOC Fault — Code 3

X

X

Insufficient charge

Check for refrigerant leaks.

Low Pressure/Loss of

 

 

 

 

X

 

Compressor pump down at

Check charge and start-up water flow.

Charge

 

 

 

start-up

 

 

 

 

 

FP1 Fault — Code 4

X

 

Reduced or no water flow in

Check pump operation or water valve operation/setting.

Water Freeze Protection

 

 

heating

 

 

 

Plugged strainer or filter. Clean or replace.

 

 

 

 

 

 

 

 

Check water flow adjust to proper flow rate.

 

X

 

Inadequate antifreeze level

Check antifreeze density with hydrometer.

 

X

 

Improper freeze protect set-

Clip JW2 jumper for antifreeze (10 F) use.

 

 

 

ting (30 F vs 10 F)

 

 

X

 

Water temperature out of

Bring water temperature within design parameters.

 

 

 

range

 

 

X

X

Bad thermistor

Check temperature and impedance correlation.

FP2 Fault — Code 5

 

X

Reduced or no airflow in cool-

Check for dirty air filter and clean or replace.

Air Coil Freeze

 

 

ing

 

 

 

Check fan motor operation and airflow restrictions.

Protection

 

 

 

 

 

 

External static too high. Check Tables 8-11.

 

 

 

 

 

 

X

Air temperature out of range

Too much cold vent air. Bring entering-air temperature within design

 

 

 

 

parameters.

 

 

X

Improper freeze protect set-

Normal airside applications will require 30 F only.

 

 

 

ting (30 F vs 10 F)

 

 

X

X

Bad thermistor

Check temperature and impedance correlation.

Condensate Fault —

X

X

Blocked drain

Check for blockage and clean drain.

Code 6

X

X

Improper trap

Check trap dimensions and location ahead of vent.

 

 

 

X

Poor drainage

Check for piping slope away from unit.

 

 

 

 

Check slope of unit toward outlet.

 

 

 

 

Poor venting. Check vent location.

 

 

X

Moisture on sensor

Check for moisture shorting to air coil.

Over/Under Voltage —

X

X

Under voltage

Check power supply and 24 vac voltage before and during operation.

Code 7

 

 

 

Check power supply wire size.

(Auto Resetting)

 

 

 

 

 

 

Check compressor starting.

 

 

 

 

 

 

 

 

Check 24 vac and unit transformer tap for correct power supply voltage.

 

X

X

Over voltage

Check power supply voltage and 24 vac before and during operation.

 

 

 

 

Check 24 vac and unit transformer tap for correct power supply voltage.

Performance Monitor —

X

 

Heating mode FP2>125 F

Check for poor airflow or overcharged unit.

Code 8

 

X

Cooling mode FP1>125 F OR

Check for poor water flow or airflow.

 

 

 

 

 

FP2< 40 F

 

FP1 and FP2

X

 

FP1 temperature is higher

Swap FP1 and FP2 thermistors.

Thermistors —

 

 

than FP2 temperature.

 

Code 9

 

 

 

 

 

X

FP2 temperature is higher

Swap FP1 and FP2 thermistors.

 

 

 

 

 

than FP1 temperature.

 

No Fault Code Shown

X

X

No compressor operation

See scroll compressor rotation section on page 28.

 

X

X

Compressor overload

Check and replace if necessary.

 

X

X

Control board

Reset power and check operation.

Unit Short Cycles

X

X

Dirty air filter

Check and clean air filter.

 

X

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 actual load of space.

 

X

X

Compressor overload

Check and replace if necessary.

Only Fan Runs

X

X

Thermostat position

Ensure thermostat set for heating or cooling operation.

 

X

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 Y and W wiring at heat pump. Jumper Y and R for compressor

 

 

 

 

operation in Test mode.

LEGEND

 

 

 

 

RV — Reversing Valve

 

 

 

 

41

Page 41
Image 41
Carrier PCV015-060 Troubleshooting, Reduced or no airflow in heat, Air temperature out of range, Cooling mode FP1125 F or

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