Baxi 18 System Installation And Service Manual page 71

11 Troubleshooting
BOILER DISPLAY
Group
Specific code
code
H.02 .09
H.02 .10
H.02 .12
H.02 .38
H.02 .70
H.03 .00
H.03 .01
H.03 .02
H.03 .05
H.03 .17
H.03 .54
Tab.34 List of permanent faults (boiler stoppage, reset required)
SHOWN ON BOILER
DISPLAY
Group Specific
code code
E.00 .04
E.00 .05
E.00 .06
E.00 .07
E.00 .16
E.00 .17
DESCRIPTION OF TEMPORARY FAULTS
Partial stoppage of the boiler
Complete stoppage of the boiler
Opening of the control unit input signal contact
from the external device
No water hardness
External unit heat recovery test failed
No identification data for boiler safety device.
Communication failure in comfort circuit (internal
fault in boiler PCB).
Temporary flame loss
Power supply voltage too low
Periodic safety check in progress
Temporary flame loss
Shutdown due to the power supply voltage being
too low
DESCRIPTION OF PERMANENT FAULTS THAT
REQUIRE RESETTING
Return temperature sensor disconnected
Return temperature sensor short circuited
Return sensor expected but not detected
The difference in return temperature is too great
DHW tank temperature sensor not connected
DHW tank temperature sensor short-circuited
CAUSE
Check / Solution
SIGNAL INDICATING BLOCKING INPUT ACTIVE
OR FROST PROTECTION ACTIVE
External cause: remove the cause
Parameter configuration error: check parameters
Faulty wiring connection: check wiring
BLOCKING INPUT SIGNAL
(WITHOUT FROST PROTECTION)
External cause: remove the cause
Parameter configuration error: check parameters
Faulty wiring connection: check wiring
-
Not possible
SCB-09 board error
MAIN PCB ERROR
Replace the main PCB
MAIN PCB ERROR
Replace the main PCB
ELECTRODE PROBLEM
Check the electrode connection and wiring
Check the condition of the electrode
GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration
FLUE GAS PIPES
Check the pipes and the terminal
Check the mains voltage
-
ELECTRODE PROBLEM
Check the electrode electrical connections
Check the condition of the electrode
GAS SUPPLY
Check the gas inlet pressure
Check the gas valve calibration
FLUE GAS EXHAUST PIPE
Check the air intake and flue gas exhaust terminal
Check the power supply voltage
CAUSE
Check / Solution
SENSOR/CONNECTION PROBLEM
Check the operation of the temperature sensor
Check the connection of the sensor/PCB
SENSOR/CONNECTION PROBLEM
Check the operation of the sensor Check the
sensor/PCB connection
-
-
SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
800 System 2 71