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8. MAINTENANCE AND REPAIRS
Under normal conditions, a suitable heat pump can heat up the tub water by 1°C to 2°C per
hour. It is therefore normal that you do not feel any difference in temperature at the outlet
level when the heat pump is on.
A heated tub must be covered and insulated to avoir any heat loss.
8.3
Breakdown and faults
In the event of a problem, the heat pump's screen displays an error code instead of temperature
indications. Please consult the table below to find the possible causes of a fault and the actions to
be taken.
Code
Malfunction or protection
Insufficient water flow fault
d1
Intlet water temperature sensor
d2
failure
Outlet water temperature sensor
d4
failure
The water temperature difference
d5
between inlet and outlet is
abnormal
Water temperature protection
d6
Anti-freeze in winter
d7
Communication failure
C5
Outdoor coil temperature
E3
sensor failure T3
Outdoor temperature sensor
E7
failure
Discharge temperature sensor
E8
failure
Communication failure between
EC
drive board and main PCB
Outdoor EEPROM failure
EE
84 | EN
Troubleshooting
1. Check that the water flow switch is not loosely mounted and
wiring is not loose
2. Check that all stop valves in the water circuit are fully open.
3. Check if the water circuit filter needs to be cleaned.
4. Check the system water resistance to make sure it is not too
high for the pump.
5. Check whether the water level in the titanium tube heat
exchanger meets the requirements.
1. Check the resistance of the sensor.
2. The sensor connector is loosen. Reconnect it.
3. The sensor connector is wet or there is water in. Remove the
water,make the connector dry. Add waterproof adhesive.
4. The sensor failure, change a new sensor.
1.Check that all stop valves in the water circuit are fully open.
2. Check if the water circuit filter needs to be cleaned.
3. Check the system water resistance to make sure it is not too
high for the pump.
4. Check whether the water level in the titanium tube heat
exchanger meets the requirements.
1.Check whether water flow rate is enough
2.Check whether the inlet water temperature sensor and outlet
water temperature sensor are installed in correct positions
1.The unit is in anti-freeze condition.
2.Auto-recoverable
1. Check the wire controller connection cable
2. Replace the wire controller
1. Check the resistance of the sensor.
2. The sensor connector is loosen. Reconnect it.
3. The sensor connector is wet or there is water in. Remove the
water,make the connector dry. Add waterproof adhesive.
4. The sensor failure, change a new sensor.
1. Check whether the power supply of the machine is correct
1. Initialize all parameters.
2. main control board is broken, change a new PCB.
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