Baxi Potterton 24/1.0 operating instructions List of Error Codes, 11.1

In the table below: - PCB = Main Control Board, BCU = Burner Control Unit.			11.0 Error Codes
UR = User Reset, AR = Automatic Reset, ARP = Automatic Reset after Power Down
		11.1		List of Error Codes
NOTE: An automatic reset is only done if the fault condition has cleared.
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•
91: Data loss in EEPROM	Failure in Class B-SW: Irreparable data loss in EEPROM				NRP	NRP
92: Device electronics error	RAM failure, HBC processor register failure, blocking chain
	undefined (toggling), safety chain discrepancy.
	Reset: Press Service Reset within 20 seconds after Power up				NRP	NRP
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
97: SW or HW failure	Failure in EGC-SW which causes non-volatile lock.				NRP	NRP
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	Low flow or faulty flow switch				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
265: BCU failure	Not supported in Main Control Board
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	Flow switch did not close within 4 minutes				UR	UR
278: Max Temp Rise	Maximum flow temperature rise exceeded, automatic reset after
	10 minutes					AR 10’

• After 10 minutes or after down power (ARP)

+ Will clear message if 65°C is achieved - does not inhibit appliance on.

18© Baxi Heating UK Ltd 2010