Riello NXHM - Page 54

116
ENGLISH
The same to "PP".
EA
Compressor discharge temperature
sensor (Tp) fault
1. Check the resistance of the sensor.
2. The Tp sensor connector is loosen. Reconnect it.
3. The Tp sensor connector is wet or there is water in. remove the water, make the
connector dry. Add waterproof adhesive.
4. The Tp sensor failure, change a new sensor.
Eb
Solar temp.sensor (Tsolar) fault
1. Check the resistance of the sensor.
2. The Tsolar sensor connector is loosen. Reconnect it.
3. The Tsolar sensor connector is wet or there is water in. Remove the water, make
the connector dry. Add waterproof adhesive.
4. The Tsolar sensor failure, change a new sensor.
Ec
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1.Check the resistance of the sensor.
2.The Tbt2 sensor connector is loosen. Reconnect it.
3.The Tbt2 sensor connector is wet or there is water in. Remove the water, make
the connector dry. Add waterproof adhesive.
4.The Tbt2 sensor failure, change a new sensor.
ED
Inlet water temp.sensor (Tw_in)
malfunction
1.Check the resistance of the sensor.
2. The Tw_in sensor connector is loosen. Reconnect it.
3.The Tw_in sensor connector is wet or there is water in. remove the water, make
the connector dry. Add waterproof adhesive.
4. The Tw_in sensor failure, change a new sensor.
EE
Hydraulic module EEprom failure
1. The EEprom parameter is error, rewrite the EEprom data.
2. EEprom chip part is broken, change a new EEprom chip part.
3. main control board of hydraulic module is broken, change a new PCB.
bH
PED PCB fault
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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.
C7
High temp. protection of inverter module
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.
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the air and reselect the pump.
6. Water outlet temp.sensor is loosen or broken, reconnect it or change a new one.
F1
DC bus low voltage protection
1. Check the power supply.
2. If the power supply is OK,and 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 from
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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.
HO
Communication fault between main
board PCB B and main control board of
hydraulic module
1.wire doesn’t connect between main control board PCB B and main control board
of hydraulic module. connect the wire.
2.Communication wire sequence is not right. Reconnect the wire in the right se-
quence.
3. Check whether there is a high magnetic eld or high power interfere, such as
lifts, large power transformers, etc.. Add a barrier to protect the unit or to move
the unit to the other place.
H1
Communication fault between inverter
module PCB A and main control board
PCB B
1. Check whether there is power connected to the PCB and driven board. Check
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power supply wire.
2. If light is on, check the wire connection between inverter module PCB and main
control board PCB, if the wire loosen or broken, reconnect the wire or change a
new wire.
3. Replace a new main PCB and driven board in turn.
H2
Refrigerant liquid temp. sensor (T2) fault
Check the resistance of the sensor.
The T2 sensor connector is loosen. Reconnect it.
The T2 sensor connector is wet or there is water inside, make the connector dry. Add
waterproof insulation.
The T2 sensor failure, change with a new sensor.