Potterton Titanium 12 Heat Engineer's Service Manual page 12

8.1.2 Lock-out (continued)
Blocking
Press the RESET key for 5 seconds: The status signals will flash red quickly and the boiler will start its reset proce-
dure.If the error code continues to display, search for the cause in the error table and apply the solution.
Lock-out (Status signals)
Status signals Description
Sensor fault,
Error Code 1
temperature
(1 x red signal)
fault or flow
fault
Maximum
temperature of
Error Code 2
heat exchanger
(2 x red signal)
or control unit
exceeded
Ignition fault:
5 burner start-up
Error Code 3
failures
(3 x red signal)
False flame
signal
5x Flame loss
Error Code 4
Fan fault
(4 x red signal)
Error Code 5
Parameter
(5 x red signal)
error
Error Code 6
Miscellaneous
(6 x red signal)
Probable causes
Check the wiring.
Sensor not or badly
Check that the sensors are operating correctly
connected
Check that the sensor has been correctly fitted
Bad connection
Vent the air in the heating system
Non-existent or
Check the water pressure
insufficient circulation
Check the cleanliness of the heat exchanger
Water circulation
Check the circulation (direction, pump, valves)
direction reversed
Replace the sensor if necessary
Sensor fault
Vent the air in the heating system
Non-existent or
insufficient circulation
Check the water pressure
Sensor not or badly
Check the cleanliness of the heat exchanger
connected
Check the circulation (direction, pump, valves)
Bad connection
Check the wiring
Sensor fault
Check that the sensors are operating correctly
No air supply or
Check that the sensor has been correctly fitted
insufficient air supply
Replace the sensor if necessary
No flue gas flow or
Check air supply
insufficient flue gas
Check flue gas flow
flow
Replace seals
Circulation
Check the wiring
Check breakdown to earth
No ignition
Check the condition of the burner set
Ignition arc, but no
Check the earthing
flame formation
Check that the gas valve is fully opened
Presence of the flame
Check the supply pressure
but insufficient
Purge the gas supply to remove air
ionization (<1μA)
Check the operation and setting of the gas valve unit
Check that the air inlet and flue gas discharge flues are not blocked
Replace the ionization/ignition electrode
External draught over
Check for adequate draw on the chimney connection
the boiler
Replace the gas/air unit
Defective gas/air unit
Bad connection
Check the wiring
Safety parameters not
found
The fault codes can be read with a suitable controller or the service
Several possible
causes tool
12
Sensor error
Maximum security
Ignition fault
Fan fault
Parameter error
Miscellaneous
Reset
Working to reset
Checking/solution