Baxi 800 Combi 2 Series Installation And Service Manual page 76

SHOWN ON BOILER
DISPLAY
Group Specific
code code
E.00 .20
E.00 .21
E.01 .04
E.01 .12
E.01 .17
E.01 .20
E.02 .13
E.02 .15
E.02 .17
E.02 .35
E.02 .47
E.04 .00
E.04 .01
E.04 .02
E.04 .03
E.04 .07
76 800 Combi 2
DESCRIPTION OF PERMANENT FAULTS THAT
REQUIRE RESETTING
The flue gas temperature sensor has short-
circuited or measured a temperature below the
range
The flue gas temperature sensor has short-
circuited or measured a temperature above the
range
Flame loss detected five times in 24 hours (with
burner on)
Temperature measured by return sensor greater
than flow temperature
No water circulation (permanent)
Maximum flue gas temperature reached
Stoppage input for the device external environ­
ment control unit
External PCB communication timeout
Permanent communication failure between gas
valve and boiler PCB
Critical safety device disconnected
Connection to external device unsuccessful
Level 5 safety settings incorrect
Flow temperature sensor short circuited
Flow temperature sensor disconnected
Maximum flow temperature exceeded
Difference between the temperature values de­
tected by flow sensors 1 and 2
CAUSE
Check / Solution
-
-
GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration
Check the air intake and flue gas exhaust terminal
Check the power supply voltage
SENSOR/CONNECTION PROBLEM
Check that the sensors are positioned the correct
way round Check that the flow sensor is in the cor­
rect position Check the return temperature in the
boiler
Check the operation of the sensors
INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle
Check the operation of the pump
Check the boiler/installation circulation
SENSOR ERROR
Check the operation of the temperature sensors
Check the connection of the temperature sensors
EXCHANGER ON FLUE GAS SIDE BLOCKED
Check the cleanliness of the exchanger
-
-
MAIN PCB ERROR
Check for any electromagnetic interference
Replace the main PCB
COMMUNICATION FAULT
Carry out the auto-detect function
ELECTRICAL CONNECTION ERROR
Possible cancellation, carry out the auto-detect func­
tion or re-enter the CN code
BOILER PCB FAULT
Replace the PCB
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the operation of the sensors
-
11 Troubleshooting