11.0 Error Codes
18
© Baxi Heating UK Ltd 2011
Error code: Display Description Lockout/Reset action
Eng Sup
10: Outside sensor Fault outside temp sensor1 AR AR
20: Boiler flow sensor Fault boiler flow temp sensor AR AR
40: Boiler return sensor Fault return temp sensor boiler AR AR
50: DHW tank sensor Fault DHW1 sensor AR AR
60: Room sensor 1 Fault room temp sensor HC1 AR AR
65: Room sensor 2 Fault room temp sensor HC2 AR AR
83: BSB short-circuit Boiler system bus short-circuit AR AR
84: BSB address collision More then 1 room units are assigned to the same HC
Assign one of them to HC2 or assign QAA7x not as room unit AR AR
85: Radio communication Communication to radio device interrupted AR• AR•
95: Time of day invalid The real time clock unit detected corrupted time of day.
96: Minor SW failure Failure in Class B-SW: Stack overflow or program sequence failure AR AR
127: Legionella temperature Legionella temperature not achieved within 48 hours AR+ AR+
157: Boiler Flow Overheat stat Boiler flow overheat thermostat / safety chain open UR UR
158: Condensate Condensate switch of safety chain opened UR UR
164: Flow Intermitent Low flow or faulty flow detector AR AR
257: Pack sensor Fault pack temp sensor
258: Pack over- temp Internal ambient temperature to high AR AR
259: CJC sensor Fault cold junction compensation sensor AR
261: Loss of Engine flame No flame after five ignition tries in Engine UR
262: Loss of Supplementary flame No flame after five ignition tries in Supplementary UR
263: Engine BCU failure Multiple communication request of Engine Burner Control Unit
unsuccessful.
1) Failure caused by BCU ARP
2) BCU Communication Timeout on Main Control Board AR
264: Supp. BCU failure Multiple communication request of Supp. Burner Control Unit
unsuccessful.
1) Failure caused by BCU ARP
2) BCU Communication Timeout on Main Control Board AR
270: excessive temp. diff. Excessive max temperature difference across the heat exchanger
during 5 minutes or excessive limit temperature difference.
If temperature difference fell below (threshold - switching
differential boiler): automatic reset
- when the maximum setting was exceeded immediately AR AR
- when the limit value was exceeded after 10 minutes AR 10’
274: Dry fire protection 7 l/min boiler flow not detected after 4 minutes UR UR
278: Max Temp Rise Maximum flow temperature rise exceeded, automatic reset after
10 minutes AR 10’
11.1 List of Error Codes
In the table below: - PCB = Main Control Board, BCU = Burner Control Unit.
UR = User Reset, AR = Automatic Reset, ARP = Automatic Reset after Power Down
NOTE: An automatic reset is only done if the fault condition has cleared.
• After 10 minutes or after down power (ARP)
+ Will clear message if 65°C is achieved - does not inhibit appliance on.
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