12.0 Errors & Sub-codes (cont.)
20
© Baxi Heating UK Ltd 2012
Boiler max temperature exceeded for gradient
(possible sticking pump or air in the circuit).
Boiler max temperature exceeded for
overtemperature (possible sticking pump or air
in the circuit).
Safety thermostat sensor tripped.
Water pressure HIGH (> 2.9 bar).
Water pressure LOW (< 0.5 bar).
Water circulation falut (overtemperature).
Water circulation fault – Temp not increased
on the flow.
Water circulation fault.
Safety error for frequent loss of flame (12
times).
Safety error for frequent loss of flame with
max correction during the ignition during
Calibration Function.
Flue thermostat sensor tripped (lockout).
Gas supply fault.
Elapsed time gas valve open without gas (short
request in a short period).
Internal error.
Plausibility test (flow/return).
Fan fault.
Dry fire.
Wrong power supply electrical frequency (Hz)
Domestic Hot Water NTC sensor fault (s.c.)
Domestic Hot Water NTC sensor fault (o.c.)
Fault flame (parasitic flame).
Under voltage.
Water pressure temporary test.
Water pressure test failed.
Aluminium sensor fault (s.c.).
Aluminium sensor fault (o.c.).
Temperature rise too fast. Check correct circulation of the
water and pump.
Temperature overshoots Set Point by 20C. Check correct
circulation of the water and pump.
Check the sensor.
Check the water pressure.
Check the water pressure.
Check correct circulation of the water and pump.
Check correct circulation of the water and pump.
Check correct circulation of the water and pump
Check the sensing electrode and cable and for flue
recirculation. Enable the automatic calibration function
before replacing components.
Check the sensing electrode and cable and for flue
recirculation. Enable the automatic calibration function
before replacing components.
Check the thermostat, correct circulation of water and
pump.
Check the power supply, sensing electrode, spark electrode
and cable. Check flue recirculation. Enable the automatic
calibration function before replacing components.
Check the gas pressure, sensing electrode, spark electrode
and cable. Replace the P.C.B. if necessary.
Replace P.C.B.
Check correct circulation of the water and pump. Check
the correct position of the sensors.
Check the fan and the cable.
Check the sensor and the correct circulation of the water
and the pump.
Check the frequency (Hz) and the power supply.
Check the sensor.
Check the sensor.
Check the correct operation of the gas valve.
Check the power supply (V~).
Check the correct circulation of the water and the pump.
Check the correct circulation of the water and the pump.
Check the sensor.
Check the sensor.
437
438
566
500
501
502
528
1
2
557
505
1
2
E110
E110
E110
E117
E118
E125
E125
E125
E128
E129
E130
E133
E134
E135
E154
E160
E270
E317
E321
E321
E384
E385
E430
E430 & flame
E431
E431
Note: (s.c.) = Short Circuit
(o.c.) = Open Circuit
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