SHOWN ON BOILER
DISPLAY
DESCRIPTION OF PERMANENT FAULTS THAT
REQUIRE RESETTING
CAUSE
Check / Solution
Group
code
Specific
code
E.00 .20
The flue gas temperature sensor has short-
circuited or measured a temperature below the
range
-
E.00 .21
The flue gas temperature sensor has short-
circuited or measured a temperature above the
range
-
E.01 .04
Flame loss detected five times in 24 hours (with
burner on)
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
E.01 .12
Temperature measured by return sensor greater
than flow temperature
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
E.01 .17 No water circulation (permanent)
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
E.01 .20 Maximum flue gas temperature reached
EXCHANGER ON FLUE GAS SIDE BLOCKED
Check the cleanliness of the exchanger
E.02 .13
Stoppage input for the device external environ
ment control unit
-
E.02 .15 External PCB communication timeout -
E.02 .17
Permanent communication failure between gas
valve and boiler PCB
MAIN PCB ERROR
Check for any electromagnetic interference
Replace the main PCB
E.02 .35 Critical safety device disconnected
COMMUNICATION FAULT
Carry out the auto-detect function
E.02 .47 Connection to external device unsuccessful
ELECTRICAL CONNECTION ERROR
Possible cancellation, carry out the auto-detect func
tion or re-enter the CN code
E.04 .00 Level 5 safety settings incorrect
BOILER PCB FAULT
Replace the PCB
E.04 .01 Flow temperature sensor short circuited
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
E.04 .02 Flow temperature sensor disconnected
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
E.04 .03 Maximum flow temperature exceeded
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the operation of the sensors
E.04 .07
Difference between the temperature values de
tected by flow sensors 1 and 2
-
11 Troubleshooting
600 Combi 2 75
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