List of error codes for the Panasonic Aquarea T-CAP H Series air-to-water heat pump
List of error codes for the air-to-water heat pump – Panasonic Aquarea T-CAP H Series
Download the manual for the Panasonic Aquarea T-CAP H Series air-to-water heat pump
Turn off the power before troubleshooting
| Symptom | Cause |
| You hear the sound of water flowing during operation. | •Refrigerant flowing inside the unit. |
| Operation slows down a few minutes after restarting the unit. | •This slowdown is a compressor protection feature. |
| The outdoor unit gives off steam or water. | •Condensation or evaporation occurring in the pipes. |
| Steam comes out of the outdoor unit in heating mode. | •This is caused by the defrost operation of the heat exchanger. |
| The outdoor unit does not operate. | •This is caused by the system’s protection control when the outdoor temperature is outside the operating range. |
| The system stops operating. | •This is caused by the system’s protection control. When the water inlet temperature is below 10°C, the compressor stops and the backup heater turns on. |
| The system is slow to heat up. | •When the panel and floor are heated at the same time, the hot water temperature may drop, which can reduce the system’s heating capacity.
•When the outdoor air temperature is low, the system may need more time to heat up. •The outdoor unit’s exhaust or intake is blocked by an obstruction, such as a buildup of snow. •When the preset water outlet temperature is low, the system may need more time to heat up. |
| The system does not heat up instantly. | •The system will take some time to heat the water if it starts operating with cold water. |
| The electric backup heater turns off automatically when disabled. | •This is caused by the indoor unit’s heat exchanger protection control. |
| The system starts operating automatically when the Clock is not set. | •The sterilization program has been set. |
| Loud refrigerant noises continue to be heard for several minutes. | •These are caused by the protection control during defrost operation at an outdoor ambient temperature below -10°C. |
| *1 COOL mode is unavailable. | •The system is locked to operate in HEAT mode only. |
Check the following before calling for service.
| Symptom | Check |
| HEAT/*1 COOL mode does not work efficiently. | •Set the temperature correctly.
•Close the heating/cooling panel valve. •Clear any obstructions from the outdoor unit’s air intake and outlet vents. |
| The unit makes noise during operation. | •The outdoor or indoor unit was installed at a slant.
•Close the cover properly. |
| The system does not operate. | •The circuit breaker is tripped/activated. |
| The operation indicator is not lit, or nothing is displayed on the remote control. | •Check whether the power supply is working properly or if there has been a power outage. |
*1 The system is locked to operate without COOL mode. It can only be unlocked by our authorized installers or our authorized
service centers.
*2 Only displayed when COOL mode is unlocked (i.e., when COOL mode is available).
Error codes
| H12 | Incompatible capacity |
| H15 | Compressor sensor fault |
| H20 | Circulator pump fault |
| H23 | Refrigerant sensor fault |
| H27 | Service valve fault |
| H28 | Solar sensor fault |
| H31 | Pool sensor fault |
| H36 | Buffer tank sensor fault |
| H38 | Brand compatibility fault |
| H42 | Low pressure protection |
| H43 | Zone 1 sensor fault |
| H44 | Zone 2 sensor fault |
| H62 | Water flow fault |
| H63 | Low pressure sensor fault |
| H64 | High pressure sensor fault |
| H65 | Defrost water circulation error |
| H67 | Outdoor thermistor fault 1 |
| H68 | Outdoor thermistor fault 2 |
| H70 | Heating element OLP fault |
| H72 | DHW tank sensor fault |
| H74 | Board communication fault |
| H75 | Low water temperature protection |
| H76 | Remote control-indoor unit communication fault |
| H90 | Indoor/outdoor communication fault |
| H91 | DHW tank heating element OLP fault |
| H95 | Power supply wiring fault |
| H98 | High pressure protection |
| H99 | Indoor freeze prevention |
| F12 | Pressure switch activated |
| F14 | Compressor rotation fault |
| F15 | Blocked fan motor fault |
| F16 | Current protection |
| F20 | Compressor overload protection |
| F22 | Module transistor overload protection |
| F23 | DC PIC fault |
| F24 | Refrigerant cycle fault |
| F25 | *1 Heating/cooling cycle fault |
| F27 | Pressure switch fault |
| F29 | Low flow overheat |
| F30 | Water outlet sensor fault :2 |
| F32 | Internal thermostat fault |
| F36 | Outdoor sensor fault |
| F37 | Water return sensor fault |
| F40 | Outdoor discharge sensor fault |
| F41 | Power factor correction fault |
| F42 | Heat exchanger outdoor sensor fault |
| F43 | Outdoor defrost sensor fault |
| F45 | Water outlet sensor fault |
| F46 | Current transformer disconnection |
| F48 | Evaporator outlet sensor fault |
| F49 | Bypass outlet sensor fault |
| F95 | *1 High pressure fault in cooling |