26 / GB
(*) BUS power supply overload
A BUS power supply overload error may occur due to the
connection of three or more devices within the installed
system. Devices which may overload the BUS network in-
clude:
- Multizone module
- Solar pump assembly
- Module for instant production of domestic hot water
To avoid overloading the BUS power supply, set micros-
witch 1 on one of the P.C.B.s inside the equipment con-
nected to the system (except the Tank) to OFF, as illus-
trated in the fi gure.
1
ON
OFF
2
microswitch
EXTERNAL UNIT ERROR LIST
TDM
ERROR
DESCRIPTION
RESET
HP
POWER
OFF
SERVICE
RESET
906 HP FAN Mismatch Error
x
907 HP V4W Mismatch Error
x
908 HP EXV Mismatch Error
x
909 HP Zero Fan Speed
x
910 HP Comunication error
x
911 HP TE Error
-- --
912 HP V4W Error Service
x
913 HP LWT Error
-- --
914 HP TR Error
-- --
916 HP TEO Error
-- --
917 HP Freeze Service
-- x
918 HP Pump Down Error
-- --
919 HP HIGH SDT Error
x
922 HP Freeze Error
x
931 HP INVERTER Error
-- --
937 No circulation error
x
946 HP compressor error
x
947 HP V4W Error
x
948 HP TD Error
-- --
949 HP TS Error
-- --
950 HP HIGH TD Service
-- x
951 HP HIGH TD Error
x
952 HP TO Error
-- --
953
HP Compressor Heater
Mismatch
-- --
954
HP Base Panel Heater Mis-
match
-- --
956
HP Compressor model
mismatch
-- --
957 HP Fan model mismatch
-- --
960 HP EWT Error
-- --
INVERTER
ERROR
DESCRIPTION 1ph 3ph
1
Heat Sink-Overheat
xx
2
Compressor Ipm Over-Current
x
3
Compressor Fail To Drive
x
4
Compressor Over-Current
xx
5
Input Voltage Lack Of Phase
x
6
Compressor Ipm Current Sampling Failure
x
7
Compressor Drive Capacitors Precharge
Failure
x
8
Dc Bus Over-Voltage
x
9
Dc Bus Under-Voltage
x
10
Ac Input Under-Voltage
x
11
Ac Input Over-Current
x
12
Ac Input Voltage Sampling Failure
x
13
Dsp&Pfc Communication Error
x
14
Heat Sink Sensor Error
x
15
Dsp&Mcu Communication Error
x
16
Abnormal Communication With Main Board
x
17
Ipm Module Over-Heat
x
18
Compressor model fault
xx
19
High Pressure Protection
xx
21
Fan1 Fail To Drive
x
27
Fan1 Over-Current
x
29
Fan1 1ph Error
x
35
High pressure switch protection
xx
36
Ow pressure switch protection
xx
37
Klixon protection
xx
38
Inter-boards communication error
x
39
IPM over current
x
40
Fail to drive the compressor
x
41
Compressor over current
x
42
IPM current sampling failure
x
43
Heat-sink over-heat
x
44
Fail to Precharge
x
45
DC bus over voltage
x
46
DC bus under voltage
x
47
AC input under-voltage
x
48
AC input over-current
x
49
compressor emergency stop
x
50
AC input voltage sampling fault
x
51
Heat-sink sensor error
x
52
DSP & MCU communication error
x
53
Abnormal communication with IDU control
board
x
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