9-3-4. How to diagnose by error code
Defect mode detected by the water heat exchange
|
|
|
|
|
|
|
|
|
|
|
|
| O ... Possible | ||
|
|
|
|
|
|
|
|
|
|
|
|
| × .... Not possible | ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
| Diagnostic functional operation |
|
| Number of |
| ||||
Check |
|
|
|
|
|
|
|
|
|
|
| Determination and action | abnormalities | Detailed | |
|
|
|
|
|
|
|
|
|
|
| |||||
code |
|
|
|
|
|
|
|
|
| Backup | Automat | for | item | ||
|
|
|
|
|
| Operational cause |
| ||||||||
|
|
|
|
|
|
| present | ic reset |
| confirmation |
| ||||
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| Pump or flowing quantity error |
|
|
|
|
| |||||||||
| 1) Detected by TC sensor |
|
|
|
|
| |||||||||
| TC |
|
| 63°C is detected in the heating or |
|
|
| 4 | 74 | ||||||
|
|
|
|
| |||||||||||
| hot water supply heat pump operation |
|
|
|
|
| |||||||||
| (except for defrosting). |
|
| 1. Almost no or little water flow. |
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
| • Not enough vent air |
|
| |
| 2)Detected by flow switch abnormality |
|
|
|
| ||||||||||
|
|
| • Dirt clogging in the water piping |
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| When no signal of the flow switch is |
|
| system. | 2 | 74 | |||||||||
| showing 2 min after the |
|
| ||||||||||||
|
|
| • The water piping is too long. |
|
| ||||||||||
| operation started. |
|
|
|
| ||||||||||
|
|
| • Installation of buffer tank and |
|
| ||||||||||
A01 |
|
|
|
|
|
|
|
|
|
|
|
|
| ||
3)Detection of chattering abnormality in | × | × | secondary pump |
|
| ||||||||||
|
|
|
|
| |||||||||||
| the flow switch input |
|
|
|
|
| |||||||||
| Chattering detection: Detects input |
|
|
| 4 | 74 | |||||||||
| changes (OFF⇔ON) 4 times within |
|
|
|
|
| |||||||||
| 10 seconds during operation. |
|
|
|
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| 4)Disconnection of the flow switch |
|
|
|
|
| |||||||||
| connector |
|
| 1. Disconnection of the flow switch |
|
| |||||||||
| When the stopped |
|
| connector. | 2 | 74 | |||||||||
| its operation, the flow switch status is |
|
| 2. Defect of the flow switch. |
|
| |||||||||
| detecting "water flow". |
|
|
|
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| Temperature increase error (heating) | Heating |
| 1. Check the water inlet, water outlet |
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
| and heater outlet (TWI, TWO, THO) |
|
| ||
| When one of the TWI, TWO and THO | O |
|
|
| ||||||||||
A02 |
|
|
|
|
|
|
|
|
| O | sensors. | 1 | 75 | ||
sensors exceeds 70°C. | Hot water | ||||||||||||||
|
|
|
|
| |||||||||||
|
|
|
|
|
|
|
|
|
|
| 2. Defect of the backup heater (defect |
|
| ||
|
|
|
|
|
|
|
|
|
| × |
|
|
| ||
|
|
|
|
|
|
|
|
|
|
| automatic reset thermostat). |
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| Temperature increase error (hot water | Heating |
| 1. Check the hot water cylinder sensor |
|
| |||||||||
A03 | supply) |
|
|
|
| O | O | (TTW). | 1 | 76 | |||||
When the TTW sensor exceeds 85°C. | Hot water | 2. Check the hot water cylinder thermal | |||||||||||||
|
|
|
| ||||||||||||
|
|
|
|
|
|
|
|
|
| × |
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| Antifreeze operation |
|
| 1. Almost no or little water flow. |
|
| |||||||||
| 1)TWO>20°C condition: |
|
| • Dirt clogging in the water piping |
|
| |||||||||
|
|
|
|
|
| ||||||||||
| 2×TC+TWO < |
|
| system. |
|
| |||||||||
|
|
|
|
|
| ||||||||||
| 2)TWO |
| 20°C condition: |
|
| • The water piping is too long. |
|
| |||||||
|
|
|
| 2. Check the heater power circuit. |
|
| |||||||||
| TC+TWO < 4°C is detected. |
|
| Heating2 |
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
| • Power supply voltage, breaker, |
| ||
A04 | 3)TWI |
|
| 10°C is detected during | O | × | Hot water2 | 77 | |||||||
|
| power supply connection | |||||||||||||
defrosting. | |||||||||||||||
|
|
| Cooling4 |
| |||||||||||
|
|
|
|
|
|
|
|
|
|
|
| 3. Set the presence of the backup |
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| heater. |
|
| |
|
|
|
|
|
|
|
|
|
|
|
| 4. Check the water inlet, water outlet |
|
| |
|
|
|
|
|
|
|
|
|
|
|
| and heat exchange (TWI, TWO, TC) |
|
| |
|
|
|
|
|
|
|
|
|
|
|
| sensors. |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
| Piping antifreeze operation |
|
| 1. Check the heater power circuit. |
|
| |||||||||
| Activating the heater under the condition |
|
| • Power supply voltage, breaker, |
|
| |||||||||
| of TWO<4orTWI<4orTHO<4 does not |
|
| power supply connection |
|
| |||||||||
|
|
|
|
|
| ||||||||||
A05 | achieve TWO,TWI,THO |
| 5°C after 30 | O | O | 2. Check the water inlet, water outlet | 1 | 78 | |||||||
| |||||||||||||||
| min elapsed. |
|
| and heater outlet sensors (TWI,. |
|
| |||||||||
|
|
|
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
| TWO, THO). |
|
| |
|
|
|
|
|
|
|
|
|
|
|
| 3. Disconnection of the backup heater. |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
67