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ENGLISH
P0
Low pressure switch protection
1. System is lack of refrigerant volume. Charge the refrigerant in right volume.
2. When at heating mode or DHW mode, the outdoor heating exchanger is dirty or
something is block on the surface. Clean the outdoor heating exchanger or remove
the obstruction.
3. The water flow is too low in cooling mode.increase the water flow.
4. Electrical expansion valve locked or winding connector is loosen. Tap-tap the valve
body and plug in/ plug off the connector for several times to make sure the valve
is working correctly.
P1
High pressure switch protection
1. Heating mode, DHW mode:
1. The water flow is low; water temp is high, whether there is air in the water system.
Release the air.
2. Water pressure is lower than 0.1Mpa, charge the water to let the pressure in the
range of 0.15~0.2Mpa.
3. Over charge the refrigerant volume. Recharge the refrigerant in right volume.
4. Electrical expansion valve locked or winding connector is loosen.
Tap-tap the valve body and plug in/ plug off the connector for several times to make
sure the valve is working correctly. And install the winding in the right location DHW
mode: Water tank heat exchanger is smaller .Cooling mode:
1. Heat exchanger cover is not removed. Remove it.
2. Heat exchanger is dirty or something is block on the surface.
Clean the heat exchanger or remove the obstruction.
P3
Compressor overcurrent protection
1. The same reason to P1.
2. Power supply voltage of the unit is low, increase the power voltage to the required range.
P4
High discharge temperature protection
1. The same reason to P1.
2. TW_out temp.sensor is loosen Reconnect it..
3. T1 temp.sensor is loosen. Reconnect it.
4. T5 temp.sensor is loosen. Reconnect it..
PD
High temperature protection of refrige-
rant outlet temp of condenser.
Heat exchanger cover is not removed. Remove it.
2. Heat exchanger is dirty or something is block on the surface.
Clean the heat exchanger or remove the obstruction.
3. There is no enough space around the unit for heat exchanging.
4. Fan motor is broken, replace a new one.
C7
Transducer module temperature too
high protection
1. Power supply voltage of the unit is low, increase the power voltage to the required
range.
2. The space between the units is too narrow for heat exchange. Increase the space
between the units.
3. Heat exchanger is dirty or something is block on the surface.
Clean the heat exchanger or remove the obstruction.
4. Fan is not running. Fan motor or fan is broken, Change a new fan or fan motor.
5. Water flow rate is low, there is air in system, or pump head is not enough. Release
the air and reselect the pump.
6. Water outlet temp.sensor is loosen or broken, reconnect it or change a new one.
F1
Low DC generatrix voltage protection
1. Check the power supply.
2. If the power supply is OK, check if LED light is OK, check the voltage PN, if it is
380V, the problem usually comes from the main board. And if the light is OFF,
disconnect the power, check the IGBT, check those dioxides, if the voltage is not
correct, the inverter board is damaged, change it.
3. And if those IGBT are OK, which means the inverter board is OK, power form rectier
bridge is not correct, check the bridge. (Same method as IGBT, disconnect the
power, check those dioxides are damaged or not).
4. Usually if F1 exist when compressor start, the possible reason is main board. If F1
exist when fan start, it may be because of inverter board.
bH
PED PCB failure.
1. After 5 minutes of power-o interval, power on again and observe whether it can
be recovered;
2. If it can't be restored, replace PED safety plate, power on again, and observe
whether it can be restored;
3. If it can not be recovered, the IPM module board should be replaced.
P6
L0
Module protection
1. Check the Heat pump system pressure.
2. Check the phase resistance of compressor.
3. Check the U-V-W power line connection sequence between the inventer board
and the compressor.
4. Check the L1-L2-L3 power line connection between the inventer board and the
Filter board.
5. Check the inventer board.
L1
DC generatrix low voltage protection
L2
DC generatrix high voltage protection
L4
MCE malfunction
L5
Zero speed protection
L8
Speed difference >15Hz protection
between the front and the back clock
L9
Speed difference >15Hz protection
between the real and the setting speed
Summary of Contents for 20191845
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