Gibson Heat Pump Troubleshooting

In the tables below you can find the list of possible troubles which you can encounter using your Gibson heat pump. The information given there may be helpful in case of your heat pump not working properly.

The types of defects or breakdowns are various. There are detailed descriptions of possible problems and causes of heat pump not cooling or heat pump fan not spinning. Here you can find some questions which give you the idea what to investigate or to check before addressing to the specialists.

The Gibson heat pump flash codes given in the tables and their descriptions are meant to give you the key to the possible problems you have with your heat pump. Do not try to do any repair if you are not a specialist!

Gibson JT4BD Heat Pump Troubleshooting

ProblemPossible Cause
Unit does not operate immediately after being restarted.Unit control initiates a 3 minute delay at the end of each cycle to protect the compressor from damage.
A whoosh or gurgling noise can be heard at the indoor unit.Sometimes, the refrigerant can be heard in the indoor coil when the outdoor unit starts or stops operation. This is not a malfunction.
Mist is coming out of the indoor unit during cooling operation.This sometimes happens when the indoor temperature and humidity are very high and the air is being cooled quickly. The mist will disappear as the indoor temperature and humidity are lowered.
A creaking or popping noise can be heard when the unit starts or stops.The plastic components of the indoor units sometimes expand and contract when they are heated and cooled.
Unit is not operating.Are the TIMER ON and TIMER OFF features being used incorrectly?
Is power disconnected or has circuit breaker tripped.
Is power shut down?
System is not cooling (or heating) efficiently.Is temperature setting correct?
Are either the air inlet or air outlet blocked on the outdoor or indoor unit?
Is filter dirty?
Is fan at low speed?
Are windows and doors properly shut?
Wireless remote is not working.Is remote in direct line of sight with indoor unit infrared receiver? Has the remote been damaged?
Remove remote control batteries for 30 seconds, then reinsert them. Replace batteries, if necessary.
Water is leaking from indoor unit.Indoor humidity level is very high and water is being blown from indoor coil. This will stop as humidity level is reduced.
Water is leaking from condensate line at indoor unit.Check condensate line outside to make sure it is not obstructed.
Check condensate line to make sure it has not been disconnected from indoor unit.
Water is leaking from the outdoor unit.During operation in high humidity areas, condensate will form on cold outdoor refrigerant pipes.
When heat pump is operating in defrost mode, ice will thaw from around outdoor coil and water will flow from the unit.
Clicking noise heard inside.Sometimes, the sound of the outdoor unit fan or compressor relay can be transmitted in a way that makes it seem to be coming from the indoor unit.
Indoor fan is not working.Heat pump units - In HEAT mode, a timed delay keeps indoor fan off for two minutes to prevent unheated air from being circulated by the indoor fan.
Heat pump units - In HEAT mode, cold outdoor temperatures and high humidity cause frost to accumulate on the outdoor unit. When this happens, the unit will enter a defrost cycle. The indoor fan is off during the 3 - 12 minute cycle.
In DRY mode, indoor fan operation may be stopped to avoid delivery of moist air to the room. Do not adjust temperature setting.

Gibson JT5BD Heat Pump Troubleshooting

FLASH CODEFAULT DEFINITION
On, No FlashStandby
1, PauseLow Stage
2, PauseHigh Stage
Continuous FlashEmergency Mode
16System Communications Failure
25Invalid Model Plug
31High Pressure Switch Trip
32Low Pressure Switch Trip
45Control Fault
46Brown out (230V)
47No 230v with Call to Run
53Outdoor Air Temp Sensor
55Coil Temp Sensor
56Temp Sensor Range Error
71Low Stage Thermal Cutout
72High Stage Thermal Cutout
73Contactor Shorted
74Contactor Open (No 230v to Comp)
81Low Stage Thermal Lockout (4 HRS)
82High Stage Thermal Lockout (4 HRS)
83Low Pressure Lockout (4 HRS)
84High Pressure Lockout (4 HRS)

Gibson 13 SEER Heat Pump Troubleshooting

STATUS INDICATORSTATUS TYPEDIAGNOSTIC DESCRIPTION
C1Operating StatusCooling, 1st Stage
H1Heating, 1st Stage
SCAnti Short Cycle Timer
OFDefrost
- -Power on, no call for operation
1FaultPressure switch, low
2Pressure switch, high
3Temperature Sensor, Ambient
4Temperature Sensor, Coil
5Board
OF (FLASHING)Input ErrorForced defrost - test short applied longer than 11 minutes

Gibson R410A Heat Pump Troubleshooting

Status LEDStatus LED DescriptionStatus LED Troubleshooting Information
Green "POWER”Module has powerSupply voltage is present at module terminals
Red "TRIP”Thermostat demand signal Y is present, but the compressor is not running1. Compressor protector is open
2. Outdoor unit power disconnect is open
3. Compressor circuit breaker or fuse(s) is open
4. Broken wire or connector is not making contact
5. Low pressure switch open if present in system & Compressor contactor has failed open
Yellow “ALERT" Flash Code 1Long Run Time Compressor is running extremely long run cycles1. Low refrigerant charge
2. Evaporator blower is not running
3. Evaporator coil is frozen
4. Faulty metering device
5. Condenser coil is dirty & Liquid line restriction (filter drier blocked if present in system)
7. Thermostat is malfunctioning
8. Comfort Alert Failure
Yellow “ALERT” Flash Code 2System Pressure Trip Discharge or suction pressure out of limits or compressor overloaded1. High head pressure
2. Condenser coil poor air circulation (dirty, blocked, damaged)
3. Condenser fan is not running
4. Return air duct has substantial leakage
5. If low pressure switch present in system, check Flash Codel information
Yellow “ALERT" Flash Code 3Short Cycling Compressor is running only briefly1. Thermostat demand signal is intermittent
2. Time delay relay or control board defective
3. If high pressure switch present go to Rash Code 2 information
4. If low pressure switch present go to Flash Code 1 information
Yellow “ALERT" Flash Code 4Locked Rotor1. Run capacitor has failed
2. Low line voltage (contact utility if voltage at disconnect is low)
• Check wiring connections
1 Excessive liquid refrigerant in compressor 4. Compressor bearings are seized
• Measure compressor oil level
Yellow “ALERT” Flash Code 5Open Circuit1. Outdoor unit power disconnect is open
2. Com pressor circuit breaker or f use(s) is open
3. Compressor contactor has failed open
• Check compressor contactor wiring and connectors
• Check for compressor contactor failure (burned, pitted or open)
• Check wiring and connectors between supply and compressor
• Check for low pilot voltage at compressor contactor coil
4. High pressure switch is open and requires manual reset
5. Open circuit in compressor supply wiring or connections & Unusually long compressor protector reset time due to extreme ambient temperature
6. Compressor windings are damaged
• Check compressor motor winding resistance
Yellow “ ALERT " Flash Code 6Open Start Circuit Current only in run circuit1. Run capacitor has failed
2. Open circuit in compressor start wiring or connections
• Check wiring and connectors between supply and the compressor “S” terminal
1 Compressor start winding is damaged
• Check compressor motor winding resistance
Yellow "ALERT” Flash Code 7Open Run Circuit Current only in start circuit1. Open circuit in compressor run wiring or connections
• Check wiring and connectors between supply and the compressor “R" terminal
2. Compressor run winding is damaged
• Check compressor motor winding resistance
Yellow “ ALERT " Flash Code 8Welded Contactor Compressor always runs1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
Yellow "ALERT" Flash Code 9Low Voltage Control circuit« 17VAC1. Control circuit transformer is overloaded
2. Low line voltage (contact utility if voltage at disconnect is low)
• Check wiring connections

Gibson KG7S Heat Pump Troubleshooting

GREEN LEDRED LEDDIAGNOSTIC
OffOffControl Fault (No Power)
OnOnNormal Operation
OnFlashMotor Fault
FlashOnTwin Fault (no motor fault)
FlashFlashCommunications Fault
OffOffControl Fault (No Power)
OnOnNormal Operation
OnFlashMotor Fault
FlashFlashCommunications Fault

Gibson Heat Pump Troubleshooting

ALERT CODEALERT CONDITION
Normal Run Solid YellowNormal operation, no trip
Code l Yellow Flash 1Long run time. Compressor is on running for more than 18 hours.
Code 2 Yellow Flash 2Compressor (pressure) trip. Compressor runs for 12 sec to 15 min followed by a compressor trip condition lasting for more than 7 min.
Code 3 Yellow Flash 3Pressure switch cycling. Compressor runs for 12 sec to 15 min followed by a compressor trip lasting between 35 sec to 7 min.
Code 4 Yellow Flash 4Locked rotor. Compressor trips within a compressor run time of 12 sec and does not start within 35 sec.
Code 5 Yellow Flash 5Compressor (moderate run) trip. Compressor runs for 15 min to 18 hrs followed by a compressor trip lasting longer than 7 min.
Code 9 Red Flash 9The current to the PROT terminal is greater than 2A.
Trip Solid RedDemand is present, but compressor is not running.