Baxi LUNA DUO-TEC 1.70 User Manual page 48

Shutdown
Description
code
Su:0 Parameter error
Maximum supply temperature
Su:1
exceeded
Maximum increase
of the supply
Su:2
temperature has
been exceeded
Max difference between
Su:7
T.supply/return exceeded
Su:8 No release signal
Line and neutral of
Su:9
power supply are mixed
up (if P43=1)
Su:10 Shutdown input is open
Shutdown input active or frost
Su:11
protection active
Communication error with the
Su:13
SCU PCB
Su:15 Gas pressure too low
Configuration fault or
Su:16
(1)
SU PCB not recognized
Configuration fault
Su:17 or default parameter table
(1)
incorrect
Configuration fault
Su:18 or PSU PCB not
(1)
recognized
Configuration fault or
Su:19
(1)
parameters "df-du" unknown
Su:20 Identification running
(1)
Communication error with the
Su:21
SU PCB
7703477.01 (1-03/18)
Probable causes
Parameter error on the PSU PCB
Non-existent or insufficient
circulation / sensor error
Non-existent or insufficient water
circulation / sensor error
Non-existent or insufficient
circulation / sensor error
External cause
Parameter error
Bad connection
Power supply incorrectly wired
Floating or 2 phase network
External cause
Parameter error
Bad connection
External cause
Parameter error
Bad connection
Bad connection with BUS
SCU PCB not installed in the boiler
Non-existent or insufficient gas
Pressure.
Incorrect setting of the Gps
gas pressure switch on the SCU
PCB
Wrong SU PCB for this boiler
Parameter dF-dU error on the PSU
PCB
Wrong PSU PCB for this boiler
---
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Bad connection
48
Checking / solution
Reset df and dU
Restore parameters
Check the circulation (direction, pump, valves)
Reasons for the heat demand
Check the circulation (direction, pump,valves)
Check the water pressure
Check that the sensors are operating correctly
Check that the sensor has been correctly fitted
Check the cleanliness of the heat exchanger
Check the circulation (direction, pump,valves)
Check the water pressure
Check that the sensors are operating correctly
Check that the sensor has been correctly fitted
Check the cleanliness of the heat exchanger
Correct the external cause
Check the parameters
Check the wiring
Line and neutral mixed up
Set parameter p43 to 0
Correct the external cause
Check the parameters
Check the wiring
Correct the external cause
Check the parameters
Check the wiring
Check the wiring
Carry out automatic detection to find aux. PCB's
Check that the gas valve is fully opened
Check the supply pressure
Check whether the Gps gas pressure control
system has been correctly fitted
Replace the Gps gas pressure control system if need be
Replace the SU PCB
Reset df and dU
Restore parameters
Replace the PSU PCB
Reset df and dU
Restore parameters
No action required
Check whether the SU PCB has been
correctly fitted in the connector on SU PCB