Troubleshooting & Diagnosis Table for Under-Bench RV SystemsUpdated a day ago
This article provides a troubleshooting and diagnosis table for Under-Bench RV Inverter Packaged Heat Pump Air Conditioners.
| Malfunction | Possible Causes |
| If the appliance is not cooling | The current temperature is lower than 64°F (18°C) |
| The set point temperature has been satisfied | |
| Defective thermistor or thermal protection | |
| Low refrigerant | |
| The compressor is damaged | |
| The heat exchanger coils are dirty | |
| The external fan is defective | |
| The Mode button is not in the right position | |
| If the appliance is not hearing | The current temperature is higher than 86°F (30°C) |
| The set point temperature has been satisfied | |
| Defective thermistor or thermal position | |
| Low refrigerant | |
| The compressor is damaged | |
| The heat exchanger coils are dirty | |
| Damaged/stuck 4-way valve | |
| The Mode button is not in the right position | |
| If the airflow is insufficient, or no longer circulates inside the vehicle | The heat exchanger coils are dirty |
| The internal/interior fan is malfunctioning | |
| The air filter is dirty/obstructed | |
| If there is water seeping into the vehicle | The condensate drain hose is cracked, clogged, or is not secured onto the exhaust port |
| If the machine does not start | Defective thermal protection |
| Damaged compressor | |
| There is insufficient power going into the unit | |
| The voltage is too low (less than 100V) | |
| The electric condenser is damaged/malfunctioning | |
| If the machine stops working | Defective thermistor or thermal protection |
| The heat exchanger coils are dirty | |
| The air filter is dirty/obstructed | |
| The external fan is defective | |
| The voltage is too low (less than 100V) | |
| The electric condenser is damaged/malfunctioning |