FAULT FINDING AND DIAGNOSIS
6 720 803 800 (2012/11) 69
E9 224 MAX thermostat activated Flue gas thermostat overheat.
276
Flow temperature exceeds 95°C Primary overheat - boiler waits for temperature to reduce; if not it becomes a
Locking error.
277
Safety temperature exceeds 95°C Main heat exchanger safety sensor overheat - boiler will wait for the
temperature to reduce; if not it becomes a Locking error 219.
285
Return temperature exceeds 95°C The boiler will stop the burn and wait to see if it cools down. If after 2 seconds
there is an increase in temperature the boiler will go to Locking error 286.
EA 227 No ionisation detected after ignition No flame is detected. The boiler will block during 4 attempts before going to
Locking fault.
EF 349 Central heating, boil detect.
Large delta T despite minimum burner.
The boiler is operating at minimum burner load and there is a greater than
18°C Flow & Return temperature difference.
No
code
212 Safety or flow temperature rises too fast Air lock or reduced water content.
213
Temperature difference between supply and
return exceeding limit
Air lock or reduced water content.
260
No temperature rise after burner starts Sensor disconnected or no water content.
380
Inlet DHW temperature higher than the DHW
outlet temperature.
The output is blocked until the inlet temperature drops below the output
temperature.
Fault
code
Cause
code Description Possible cause
Table 22 Blocking codes
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