28
Error codes:
Error code
Cause
Remedial Action
Display CU
Display DU
(“xx”
1*
) please
check probe: “xx”
“xx”
1*
Problem with probe “xx”
2*
Check probe “xx”
(33)
LLW alarm
33
Below low water level
Provide supply of water
(34)
HHW alarm
34
High water level reached
Switch off water supply
(40) PIN 1
power too low
40
24V supply 1
failed
Check power supply unit 1
(41) PIN 2
power too low
41
24V supply 2
failed
Check power supply unit 2
(50) MU A
high temperature
50
Temperature in MU
distribution cabinet too high
Optimise heat balance in MU distribution
cabinet
(51) MU B
high temperature
51
Temperature in MU
distribution cabinet too high
Optimise heat balance in MU distribution
cabinet
(60) MU
hardware error
60
MU hardware error
Restart device;
Replace MU electronic board
(61) MU A
case connection
61
MU A earth cable faulty
Check measuring cable to housing
mounting flange
(62) MU B
case connection
62
MU B earth cable faulty
Check measuring cable to housing
mounting flange
(63) MU A
CAN bus no data
63
MU A transmitting no data via
CAN-Bus
Restart device;
Replace MU electronic board
(64) MU B
CAN bus no data
64
MU B transmitting no data via
CAN-Bus
Restart device;
Replace MU electronic board
(65) MU
CAN bus no data
65
CU receiving no data from
CAN-Bus
Check CAN-bus lead
Check CAN-bus voltage supply
Replace MU electronic board
(98) CU
hardware error
98
CU hardware error
Restart CU;
Replace CU
(99) PIN 3
power too low
99
24V supply not available on
CAN-Bus
Check 24V CAN PIN 3
3*
1*:
“xx” = Number of probe “01” to “32”
2*:
Probe fault such as cable breakage
System error such as water over steam
3*:
Remove cable from PIN 3, measure output at terminal:
24V CAN output of the CU3 shows 24V
error in the CAN cable
24V CAN output of the CU3 does not show 24V
Replace CU
