The tables below are the lists of possible issues which you may encounter having Goodman heat pump not working. There are the descriptions for different Goodman modifications – GPC1336M41, R 410A, and N2H3.
The tables contain symptoms (heat pump not cooling), possible causes and remedies for them. In case, for instance, of heat pump fan not spinning properly, you may do some things to fix the problem without doing the repair.
If the symptom and description show that the heat pump needs serious repair, or the actions described are too complicated for you, do not do it by yourself and call the specialist to do it.
Goodman GPC1336M41 Heat Pump Troubleshooting
| SYMPTOM | POSSIBLE CAUSE | REMEDY |
|---|---|---|
| High head - low suction | a. Restriction in liquid line or flowrator | a. Remove or replace with proper size flowrator. |
| High head - high or normal suction | a. Dirty condenser coi | a. Clean coil. |
| b. Overcharged | b. Correct System charge. | |
| c. Condenser fan not running | c. Repair or Replace. | |
| Low head - high suction | a. Incorrect flowrator | a. Replace with correct flowrator. |
| b. Defective compressor valves | b. Replace compressor. | |
| c. Flowrator not seating properly | c. Check for debris under flowrator or deformed flowrator. Remove debris or replace flowrator. | |
| d. Defective reversing valve | d. Replace reversing valve. | |
| Unit will not run | a. Power off or loose electrical connection | a. Check for unit voltage at contactor in unit. |
| b. Thermostat out of calibration set too high | b. Reset. | |
| c. Defective contactor | c. Check for 24 volts at contactor coil replace if contacts are open. | |
| d. Blown fuses or tripped breaker | d. Replace fuse or reset breaker. | |
| e. Transformer defective | e. Check wiring - replace transformer. | |
| f. High or low pressure control open (Optional) | f. Reset high pressure control or check unit charge. High pressure control opens at 610 psig. Low pressure control opens at 22 psig. | |
| g. Compressor overload contacts open | g. Replace compressor. | |
| NOTE: Wait at least 2 hours for overload to reset. | ||
| Condenser fan runs, compressor doesn’t | a. Loose connection | a. Check for unit voltage at compressor check & tighten all connections. |
| b. Compressor stuck, grounded or open vending open internal overload | b. Wait at least 2 hours for overload to reset If still open, replace the compressor. | |
| c. Low voltage connection | c. At compressor terminals, voltage must be within 10 % of nameplate volts when unit is operating. | |
| d. Capacitor weak, open, or shorted | d. Check capacitor. If defective, replace. | |
| Low suction - cool compressor Iced evaporator coil | a. Low indoor airflow | a. Increase speed of blower or reduce restriction - replace air filters. |
| Compressor short cycles | a. Defective overload protector | a. Replace - check for correct voltage. |
| b. Unit cycling on low pressure control | b. Check refrigerant charge and/or airflow. | |
| Registers sweat | a. Low airflow | a. Increase speed of blower or reduce restriction replace air filters. |
| High suction pressure | a. Excessive load | a. Recheck load calculation. |
| b. Defective compressor | b. Replace. | |
| c. Reversing valve not seating properly. | c. Replace. | |
| Insufficient cooling | a. Improperly sized unit | a. Recalculate load. |
| b. Improper airflow | b. Check - shouId be approximately 400 CFM per ton. | |
| c. Incorrect refrigerant charge. | c. Charge per procedure attached to unit service panel. | |
| d. Incorrect voltage | d. At compressor terminals, voltage must be within 10% of nameplate volts when unit is operating. |
Goodman R 410A Heat Pump Troubleshooting
| Symptom | Descr | Cause | Action | Cautions |
|---|---|---|---|---|
| - Motor rocks slightly when starting. | - This is normal start-up for variable speed motor. | — | — | — |
| - Motor won't start. | - No movement. | - Manual disconnect switch off or door switch open. | - Check 230 Vac power at motor. | - Turn power OFF prior to repair. |
| - Blown fuse or circuit breaker. | - Check low voltage (24 Vac R to C) at motor. | Wait 5 minutes after disconnecting power before opening motor. | ||
| - 24 Vac wires miswired. | - Check low voltage connections (G, Y, W, R, C) at motor. | - Handle electronic motor/ control with care. | ||
| - Unseated pins in wiring harness connectors. | - Check for unseated pins in connectors on motor harness. | |||
| - Bad motor/ control module. | - Test with a temporary jumper between R - G. | |||
| - Moisture present in motor or control module. | ||||
| - Motor rocks, but won’t start. | - Loose motor mount. | - Check for loose motor mount. | - Turn power OFF prior to repair. | |
| - Blower wheel not tight on motor shaft. | - Make sure blower wheel is tight on shaft. | Wait 5 minutes after disconnecting power before opening motor. | ||
| - Bad motor/ control module. | - Perform motor/ control replacement check, ECM motors only. | - Handle electronic motor/ control with care. | ||
| - Motor oscillates up & down while being tested off of blower. | - It is normal for motor to oscillate with no load on shaft. | — | — | — |
| - Motor starts, but runs erratically. | - Varies up and down or intermittent. | - Variation in 230 Vac to motor. | - Check line voltage for variation or “sag". | - Turn power OFF prior to repair. |
| - Unseated pins in wiring harness connectors. | - Check low voltage connections (G, Y, W, R, C) at motor, unseated pins in motor harness connectors. | |||
| - Erratic CFM command from "BK" terminal. | - Check-out system controls - Thermostat. | |||
| - Improper thermostat connection or setting. | - Perform Moisture Check. | |||
| - Moisture present in motor/ control module. | ||||
| - "Hunts" or "puffs" at high CFM (speed). | - Incorrect or dirty filters). | - Does removing panel or filter reduce "puffing’’? | - Turn power OFF prior to repair. | |
| - Incorrect supply or return ductwork. | - Check/ replace filter. | |||
| - Incorrect blower speed setting. | - Check/ correct duct restrictions. | |||
| - Adjust to correct blower speed setting. | ||||
| - Motor starts, but runs erratically. | - Stays at low CFM despite system call for cool or heat CFM. | - 24 Vac wires miswired or loose. | - Check low voltage (Thermostat) wires and connections. | - Turn power OFF prior to repair. Wait 5 minutes after disconnecting power before opening motor. |
| - "R" missing/ not connected at motor. | - Verify fan is not in delay mode - wait until delay complete. | - Handle electronic motor/ control with care. | ||
| - Fan in delay mode. | - Perform motor/ control replacement check. ECM motors only. | |||
| - Stays at high CFM. | - "R" missing/ not connected at motor. | - Is fan in delay mode? - wait until delay time complete. | - Turn power OFF prior to repair. Wait 5 minutes after disconnecting power before opening motor. | |
| - Fan in delay mode. | - Perform motor/ control replacement check. ECM motors only. | - Handle electronic motor/ control with care. | ||
| - Blower won’t shut off. | - Current leakage from controls into G, Y, or W. | - Check for Triac switched t'stat or solid state relay. | - Turn power OFF prior to repair. | |
| - Excessive noise. | - Air noise. | - High static creating high blower speed. | - Check/ replace filter. | - Turn power OFF prior to repair. |
| - Incorrect supply or return ductwork. | - Check/ correct duct restrictions. | |||
| - Incorrect or dirty filter(s). | - Adjust to correct blower speed setting. | |||
| - Incorrect blower speed setting. | ||||
| - Noisy blower or cabinet. | - Loose blower housing, panels, etc. | - Check for loose blower housing, panels, etc. | - Turn power OFF prior to repair. | |
| - High static creating high blower speed. | - Check for air whistling thru seams in ducts, cabinets or panels. | |||
| - Air leaks in ductwork, cabinets, or panels. | - Check for cabinet/ duct deformation. | |||
| - "Hunts" or "puffs" at high CFM (speed). | - High static creating high blower speed. | - Does removing panel or filter reduce "puffing"? | - Turn power OFF prior to repair. | |
| - Incorrect or dirty filter(s). | - Check/ replace filter. | |||
| - Incorrect supply or return ductwork. | - Check/ correct duct restrictions. | |||
| - Incorrect blower speed setting. | - Adjust to correct blower speed setting. | |||
| - Evidence of Moisture. | - Motor failure or malfunction has occurred and moisture is present. | - Moisture in motor/ control module. | - Replace motor and perform Moisture Check. | - Turn power OFF prior to repair. Wait 5 minutes after disconnecting power before opening motor. |
| - Handle electronic motor/ control with care. |
Goodman N2H3 Heat Pump Troubleshooting
| Status LED | Status LED Description | Status LED Troubleshooting Information |
|---|---|---|
| Green “POWER” | Module has power | Supply voltage is present at module terminals |
| Red “TRIP” | Thermostat demand signal Y1 is present, but the compressor is not running | 1. 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 | ||
| 6. Compressor contactor has failed open | ||
| Yellow “ALERT” Flash Code 1 | Long Run Time Compressor is running extremely long run cycles | 1. Low refrigerant charge |
| 2. Evaporator blower is not running | ||
| 3. Evaporator coil is frozen | ||
| 4. Faulty metering device | ||
| 5. Condenser coil is dirty | ||
| 6. Liquid line restriction (filter drier blocked if present in system) | ||
| 7. Thermostat is malfunctioning | ||
| Yellow “ALERT” Flash Code 2 | System Pressure Trip Discharge or suction pressure out of limits or compressor overloaded | 1. 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 Code 1 information | ||
| Yellow “ALERT” Flash Code 3 | Short Cycling Compressor is running only briefly | 1. Thermostat demand signal is intermittent |
| 2. Time delay relay or control board defective | ||
| 3. If high pressure switch present go to Flash Code 2 information | ||
| 4. If low pressure switch present go to Flash Code 1 information | ||
| Yellow “ALERT” Flash Code 4 | Locked Rotor | 1. Run capacitor has failed |
| 2. Low line voltage (contact utility if voltage at disconnect is low) | ||
| 3. Excessive liquid refrigerant in compressor | ||
| 4. Compressor bearings are seized | ||
| Yellow “ALERT” Flash Code 5 | Open Circuit | 1. Outdoor unit power disconnect is open |
| 2. Compressor circuit breaker or fuse(s) is open | ||
| 3. Compressor contactor has failed open | ||
| 4. High pressure switch is open and requires manual reset | ||
| 5. Open circuit in compressor supply wiring or connections | ||
| 6. Unusually long compressor protector reset time due to extreme ambient temperature | ||
| 7. Compressor windings are damaged | ||
| Yellow “ALERT” Flash Code 6 | Open Start Circuit Current only in run circuit | 1. Run capacitor has failed |
| 2. Open circuit in compressor start wiring or connections | ||
| 3. Compressor start winding is damaged | ||
| Yellow “ALERT” Flash Code 7 | Open Run Circuit Current only in start circuit | 1. Open circuit in compressor run wiring or connections |
| 2. Compressor run winding is damaged | ||
| Yellow “ALERT” Flash Code 8 | Welded Contactor Compressor always runs | 1. Compressor contactor has failed closed |
| 2. Thermostat demand signal not connected to module | ||
| Yellow “ALERT” Flash Code 9 | Low Voltage Control circuit < 17VAC | 1. Control circuit transformer is overloaded |
| 2. Low line voltage (contact utility if voltage at disconnect is low) |