Alpha Pro Tec Plus 115, Installation And Servicing Instructions, Page: 34 / 56

34
Ignition failure.
Flame detection fault.
Overheat thermostat lock-out.
Relating to thermostats, thermal fuse, or manual reset thermostat.
Fan speed fault.
High flue temperature fault.
Gas valve electrical error.
Flow and return sensor anomaly detected.
The sensor shows an incorrect temperature value.
Flow sensor temperature rise incorrect.
The time taken for the flow temperature to rise is too great.
Return sensor temperature rise incorrect.
The time taken for the return temperature to rise is too great.
Flow and return sensor anomaly detected.
Sudden temperature change detected on the flow or return sensor.
Main PCB fault.
Flow sensor short circuit.
Flow sensor out of range.
Sensor measures a temperature outside normal working range.
Not used
Return sensor short circuit.
Return sensor out of range.
Sensor measures a temperature outside normal working range.
Flow and return sensor connection fault.
Fault may occur after several minutes of boiler operation.
Alpha Pro Tec Plus 50, 70, 90, 115 - Fault Finding
A
B
C
RESET
RESET
Fig. 8.1
The boiler will let you know of any faults by the flashing screen and code.
There are different types of codes that can be divided up as follows:
'0Axx' for resettable faults (Fig. 8.1). (Before resetting the fault you will need to
wait for the boiler to finish its post ventilation function, which lasts approximately
60 seconds.
'0Exx' and 'FExx' for non-resettable anomalies.
The 'xx' suffix stands for the fault code described in the following tables.
8 FAULT FINDING
Fault code
0A
Fault description Possible solutions
Check for correct gas supply (purged and valves open).
Check ignition electrode position and spark.
Check flame sensing electrode connections.
Check gas valve operation.
Check flame sensing electrode connections.
Check for a short circuit to the electrode or wires.
Check for water circulation.
Check for air in the heat exchanger.
Check for system restrictions and blockages.
Check overheat thermostat and connections.
Reset overheat thermostat if required
Check flue and ventilation.
Check air inlet manifold and pipe.
Check for fan damage/fault.
Check fan wire connections.
Check for air in the primary heat exchanger.
Check for system restrictions causing overheating.
Check the flue run for restrictions or blockages.
Check gas valve connections.
Check main PCB.
Check gas valve operation.
Check for gas contamination.
Check for poor or incorrect circulation.
Check for external circuit influences.
Check resistances of flow and return sensors.
Check system circulation.
System volume or flow is too high.
The boiler output is insufficient for the system.
Check system circulation.
System volume or flow is too high.
The boiler output is insufficient for the system.
Check system circulation.
Check operation of zone valves.
Check resistances and function of flow and return sensors.
Check all electrical connections.
Check for water ingress in connections.
Check flow sensor connections and wires.
Check for water ingress in connections.
Check flow sensor connections and damaged wires.
Check sensor resistance values.
Check return sensor connections and wires.
Check for water ingress in connections.
Check return sensor connections and damaged wires.
Check return sensor resistance values.
Check the wires are connected to the correct sensors.
0A1
0A2
0A3
0A5
0A7
0A9
0A15
0A16
0A17
0A18
0A21
0A30
0A31
0A37
0A43
0A44
0A80