HTW ECO-THERMAL PLUS -V18WD2RN8PLUS Manuel De L'utilisateur Et D'installation page 148

ERROR MALFUNCTION
CODE OR PROTECTION
Zone 2 water flow temp. sensor
(Tw2) fault.
The plate heat exchanger
water outlet temperature
sensor (Tw_out) fault.
Three times "PP" protection
and Tw_out＜7℃
Communication fault between
master unit and slave unit
(in parallel)
Communication fault between
main control board of hydrautic
module and Ta / room
thermostart transfer PCB.
Inverter module board EE
PROM fault
H6 displayed 10 times in 120
minutes.
Low pressure protection
（Pe<0.6） occured 3 times
in 1 hour in cooling mode
Low pressure protection
FAILURE CAUSE
AND CORRECTIVE ACTION
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.
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.
The same to "PP".
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;
1. temperature collecting plate is set effectively, but it is not
connected with temperature collecting plate.
2. temperature collecting plate connection wire is not connected,
check the connection line and joint
3. Temperature plate damaged, replace it
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.
Refer to H6
Refer to P0
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.
3. The water flow is low in cooling mode.
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.
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