| Diagnostic functional operation |
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| Number of |
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Check |
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| Determination and action | abnormalities | Detailed | |
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code |
| Backup | Automat | for | item | ||
Operational cause |
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| present | ic reset |
| confirmation |
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| Pressure switch operation |
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| 1. Almost no or little water flow. |
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| The pressure switch operates for 300 |
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| 2. Defect of the flow switch. |
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A07 | sec continuously during the heat pump | O | × | 3. | 1 | 79 | |
| operation. |
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| conditions. |
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| 4. Defect in the pressure switch. |
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| Low pressure sensor operation error |
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| 1. Almost no or little water flow. |
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| The low pressure sensor detected 0.2 |
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| 2. Defect of the flow switch. |
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A08 | MPa or less. | O | × | 3. | 8 | 80 | |
| defrosting (a lot of frost formation) |
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| under the above conditions. |
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| 4. Defect in the low pressure sensor. | 2 |
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| Overheat protection operation |
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| 1. No water (heating without water) or |
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| When the thermostat of the backup |
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| no water flow. | 2 |
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A09 | heater activates during the operation of | O | × | 2. Defect of the flow switch. |
| 81 | |
the heat pump or backup heater. |
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| When the thermostat operation is |
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| 3. Defect of the backup heater (poor | 1 |
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| automatic reset thermostat). |
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| activated while it has been stopped. |
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| Operation of the release protection | Heating |
| 1. Almost no water flow. |
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| When the TWO release counts to 10. | Cooling |
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| 2. Defect of the flow switch. |
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A11 |
| × | × | 10 | 82 | ||
| 3. Check the water outlet temperature | ||||||
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| Hot water |
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| sensor (TWO). |
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| Heating, hot water heater |
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| 1. Activated by a large load of heating |
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| The antifreeze control is detected under |
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| or hot water supply. |
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| the condition of TWI<20°C while |
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| 2. Check the heater power circuit |
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A12 | TWI>15°C, TTW>20°C is not detected | O | O | (backup or hot water cylinder | 1 | 83 | |
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| after the heater backup. |
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| heater). |
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| • Power supply voltage, breaker, |
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| power supply connection |
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| Regular communication error |
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| between hydro unit and remote |
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E03 | controller | × | O | 1. Check remote control connection. | 1 | — | |
When there is no regular communication | 2. Defect in the remote control. | ||||||
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| from the remote control for 3 min, or |
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| when no remote control is equipped. |
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| Regular communication error |
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| 1. Check the serial circuit. |
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E04 | between hydro unit and outdoor unit | O | O | • Miswiring of the crossover between | 1 | 84 | |
The serial signal cannot be received | the water heat exchanger and the | ||||||
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| from outdoor. |
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| outdoor unit |
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| TC sensor error |
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| 1. Check the resistance value and |
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F03 | Open or short circuit in the heat | O | O | connection of the heat exchange | 1 | 85 | |
| exchange temperature sensor. |
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| temperature sensor (TC). |
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| TWI sensor error |
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| 1. Check the resistance value and |
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F10 | Open or short circuit in the water inlet | O | O | connection of the water inlet | 1 | 86 | |
| temperature sensor. |
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| temperature sensor (TWI). |
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| TWO sensor error |
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| 1. Check the resistance value and |
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F11 | Open or short circuit in the water outlet | × | O | connection of the water outlet | 1 | 87 | |
| temperature sensor. |
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| temperature sensor (TWO). |
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| TTW sensor error |
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| 1. Check the resistance value and |
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F14 | Open or short circuit in the hot water | × | O | connection of the hot water cylinder | 1 | 87 | |
| cylinder sensor. |
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| sensor (TTW). |
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