Ariston NIMBUS PLUS S NET - Internal Unit Error List (Continued); Error codes and troubleshooting; External Unit Error List; Inverter error codes and troubleshooting

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(*) BUS power supply overload
A BUS power supply overload error may occur due to the con-
nection of three or more devices within the installed system.
Devices which may overload the BUS network include:
- Multizone module
- Solar pump assembly
- Module for instant production of domestic hot water
To avoid overloading the BUS power supply, set microswitch
1 on one of the P.C.B.s inside the equipment connected to the
system (except the Tank) to OFF, as illustrated in the gure.
1
ON
OFF
2
microswitch
(**) Table of inverter error codes
in case of an external unit error (HP 939 error code), read the
parameter 17.11.1 and refer to the following table to identify
the cause of the error.
2 P4 Second thermostat of resistance (manual)
- Check main circulation activation
- Check water ow by par 17.11.3
- Check safety thermostat status and wirings
2 P5 First thermostat of resistance (auto)
Check main circulation activation
- Check water ow by par 17.11.3
- Check safety thermostat status and wirings
2 P6 Night tari contact not present - Par 17.5.2 = HP-HC or HP-HC 40°C and par. 17.1.0 = Absent
2 P7 Precirculation Error Water ow not detected for 5 times during pre-circulation
2 P9 SG ready input conguration not completed Just one of par 17.1.0 or 17.1.1 is dened as SG Ready input
EXTERNAL UNIT ERROR LIST
TDM
ERROR
DESCRIPTION
RESET
HP
POWER
OFF
SERVICE
RESET
905 HP CMP Mismatch Error x
906 HP FAN Mismatch Error x
907 HP V4W Mismatch Error x
908 HP EXV Mismatch Error x
909 HP Zero Fan Speed x
947 HP V4W Error x
912
HP V4W Error Service
x
948 HP TD Error -- --
949 HP TS Error -- --
911 HP TE Error -- --
952 HP TO Error -- --
913 HP LWT Error -- --
914 HP TR Error -- --
916 HP TEO Error -- --
915 HP COMM TDM Error -- --
953
HP Compressor Heater
Mismatch
-- --
954 HP Base Panel Heater Mismatch -- --
956
HP Compressor model
mismatch
-- --
957 HP Fan model mismatch -- --
922 HP Freeze Error x
917 HP Freeze Service -- x
951 HP HIGH TD Error x
950 HP HIGH TD Service -- x
918
HP Pump Down Error
--
--
919 HP HIGH SDT Error x
931 HP INVERTER Error -- --