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