Baxi MainEco Combi 24 Installation And Service Manual page 71

Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24
Lock out (Error code - e[KK)
Error Description
code
Flow and return
e[35
reversed
5x Flame loss
e[36
Communication fault
e[37
Communication error
e[38
with the SCU PCB
Shutdown input in
e[39
locked-out mode
HRU/URC unit test error
e[40
Maximum control unit
e[41
temperature exceeded
02092014 - 7619497-02
Probable causes
Bad connection
4
Sensor fault
4
Sensor not or badly
4
connected
Water circulation direction
4
reversed
No ionization current
4
Internal fault in gas/air unit 4
4
Bad connection
4
Defective SCU PCB
4
External cause
4
Bad connection
4
Parameter incorrectly set
4
HRU/URC unit test error
4
External cause
4
Bad connection
4
Parameter incorrectly set
4
No air supply or insufficient
4
air supply
No flue gas flow or
4
insufficient flue gas flow
Recirculation
4
Checking / solution
Replace the sensor if necessary
4
Check the circulation (direction, pump, valves)
4
Check that the sensors are operating correctly
4
Check that the sensor has been correctly fitted
4
Purge the gas supply to remove air
4
Check that the gas valve is fully opened
4
Check the supply pressure
4
Check the operation and setting of the gas valve
4
unit
Check that the air inlet and flue gas discharge flues
4
are not blocked
Check that there is no recirculation of flue gases
4
Replace the gas/air unit
Check the wiring
4
Replace SCU PCB
4
Suppress the external cause
4
Check the wiring
4
Check the parameters
4
Check the HRU/WTW unit
4
Suppress the external cause
4
Check the wiring
4
Check the parameters
4
Check air supply
4
Check flue gas flow
4
Replace seals
4
9. Troubleshooting
69