Ferroli RXA-I PLUS Series, User Manual

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ERROR CODE AND TROUBLESHOOTING
P1 High pressure protection
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 than the required 1.7m
2
.(10-16kW unit)or 1.4m
2
(5-7kW unit)
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 pro-
tection
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. System is lack of refrigerant volume. Charge the refrigerant in right volume.
3.Twout temp sensor is loosen Reconnect it..
4. T1 temp sensor is loosen. Reconnect it.
5. T5 temp sensor is loosen. Reconnect it.
P5
High Temperature difference
protection between water inlet
and water outlet of the plate
heat exchanger
1. Check that all shut off valves of the water circuit are completely open.
Check if the water filter needs cleaning.
Refer to "9.4 Charging water"
Make sure there is no air in the system (purge air).
Check on the manometer that there is sufficient water pressure.
The water pressure must be >1 bar (water is cold).
Check that the pump speed setting is on he highest speed.
Make sure that the expansion vessel is not broken.
Check that the resistance in the water circuit is not too high for the pump (refer to "10.6
Setting the pump speed" ).
P6 Compressor module 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 exchan-
ger or remove the obstruction
4. Fan is not running. Fan motor or fan is broken, Change a new fan or fan motor.
5. Over charge the refrigerant volume. Recharge the refrigerant in night volume.
6. Water flow rate is low, there is air in system, or pump head is not enough. Release the
air and reselect the pump.
7. Water outlet temp sensor is loosen or broken, reconnect it or change a new one.
8. Water tank heat exchanger is smaller than the required 1.7m
2
.(10-16kW unit)or
1.4m
2
(5-7kW unit)
9.Module wires or screws are loosen. Reconnect wires and screws.
The Thermal Conductive Adhesive is dry or drop.Add some thermal conductive adhesi-
ve.
10.The wire connection is loosen or drop. Reconnect the wire.
11. Drive board is defective, replace a new one.
12. if already confirm the control system has no problem, then compressor is defective,
replace a new compressor.
Pb Anti-freeze mode protection.
Unit will return to the normal operation automatically.
Pd
High temperature protection
of refrigerant outlet temp of
condenser.
1. Heat exchanger cover is not removed. Remove it.
2. Heat exchanger is dirty or something is block on the surface. Clean the heat exchan-
ger 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.
PP
Water inlet temperature is
higher than water outlet in hea-
ting mode
1.The water inlet/outlet sensor wire connector is loosen. Reconnect it.
2.The water inlet/outlet (Tw_in /Tw_out) sensor is broken, Change a new sensor.
3. Four-way valve is blocked. Restart the unit again to let the valve change the direction.
Four-way valve is broken, change a new valve.
Error
code
Malfunction or protection Failure cause and Corrective action