Riello NXHM - Page 55

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ENGLISH
H3
Refrigerant gas temp. sensor (T2B) fault
1. Check the resistance of the sensor.
2. The T2B sensor connector is loosen. Reconnect it.
3. The T2B sensor connector is wet or there is water in. remove the water, make
the connector dry. Add waterproof adhesive.
4. The T2B sensor failure, change a new sensor. 1.Check the resistance of the
sensor.
H4
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The sum of the number of times L0 and L1 appear in an hour equals three.See L0 and
L1 for fault handling methods
H5
Room temp.sensor (Ta) fault
1. Check the resistance of the sensor.
2. The Ta sensor is in the interface.
3. The Ta sensor failure: change a new sensor or change a new interface, or reset
the Ta, connect a new Ta from the hydraulic
H6
DC fan motor fault
1. Strong wind or typhoon below toward to the fan, to make the fan running in the
opposite direction. Change the unit direction or make shelter to avoid typhoon
below to the fan.
2. fan motor is broken, change a new fan motor.
H7
Main circuit voltage protection fault
1. Check whether the power supply input is in the available range.
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3 minutes than power on.
4. the circuit defect part of Main control board is defective. Replace a new Main PCB.
H8
Pressure sensor fault
1. Pressure sensor connector is loosen, reconnect it.
2. Pressure sensor failure. change a new sensor.
H9
Outlet water for zone 2 temp.sensor
(Tw2) fault
1. Check the resistance of the sensor.
2. The Tw2 sensor connector is loosen. Reconnect it.
3. The Tw2 sensor connector is wet or there is water in. Remove the water, make
the connector dry. add waterproof adhesive.
4. The Tw2 sensor failure, change a new sensor.
HA
Outlet water temp.sensor (Tw_out) fault
1. Check the resistance of the sensor.
2. The TW_out sensor connector is loosen. Reconnect it.
3. The TW_out sensor connector is wet or there is water in. remove the water, make
the connector dry. add waterproof adhesive.
4. The TW_out sensor failure, change a new sensor.
H b
Three times “PP” protection and Tw_
out<7°C
The same to "PP".
HD
Communication fault between master
unit and slave unit (in parallel)
1. Address code missing or address code setting duplicate, reset address code.
2. The connected wire is wrong, reconnect the wire.
3. Chick whether the main board fuse is damaged.
4. Add a network matching wire betewwn the ports H1 and H2 at the terminal of
the communication system.
5. Put the SW9 to “on” of the master unit.
HE
Communication fault between main con-
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room thermostart transfer PCB
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re collecting plate.
2. Temperature collecting plate connection wire is not connected, check the connection
line and joint.
3. Temperature plate damaged, replace it
HF
Inverter module board EE PROM fault
1. The EEprom parameter is error, rewrite the EEprom data.
2. EEprom chip part is broken, change a new EEprom chip part.
3. Main PCB is broken, change a new PCB.
HH
H6 displayed 10 times in 120 minutes
Refer to H6.
HP
Low pressure protection (Pe<0.6) occu-
red 3 times in 1 hour in cooling mode
Refer to P0.
P0
Low pressure protection
1. System is lack of refrigerant volume. Charge the refrigerant in right volume.
2. When at heating mode or heat water mode, Heat exchanger is dirty or something is
block on the surface. Clean the heat exchanger or remove the obstruction.
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4. Electrical expansion valve locked or winding connector is loosen. Tap-tap the valve
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working correctly and install the winding in the right location.