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F
l
F7
p
u m p
Reason
Flue gas temperature limitation value exceeded 3 times within a preset time period.
Cause:
Heat exchanger polluted and not able to effectively transfer heat to the system water.
Corrective Action:
Check and clean the heat exchanger.
Cause:
Defective (partially shorted) flue gas sensor or sensor connection.
Corrective Action:
Check for moisture in the sensor connections or replace sensor.
Cause:
There is no water in the unit while firing.
Corrective Action:
Bleed all air from the unit so the heat from combustion can be transferred to the water and won't leave through the flue
Cause:
Heat exchanger failure.
Corrective Action:
Contact Lochinvar Limited for further guidance.
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F
a
F8
p
u m p
Reason
Boiler not operational after 4 starting attempts.
Cause:
No spark.
Corrective Action:
Check the condition of the ignition electrode and clean/replace if necessary.
Check the condition of the ceramic insulator. Replace electrode if any sign of damage is present.
Check the distance between the electrode pin, earth pin and burner.
Check the condition of the ignition cable and replace if necessary.
Check the condition of the earth wire/connection of the ignition electrode and replace if necessary.
Check the condition of the electrode cap and replace if necessary.
Check the incoming power supply. The supply voltage must be 230 VAC 50Hz 1Ph.
Check for correct electrical earthing of the boiler.
Failed burner control system. Change the burner control PCB.
Cause:
Ignition spark, but no flame.
Corrective Action:
Ensure all isolation valves in the gas supply line are completely open. The nominal gas inlet pressure should be 20 mbar.
Check that the gas supply pipework has been correctly purged (start-up new systems).
Check if the gas valve opens. When there is power supply to the gas valve, but the valve does not open, the gas valve
must be replaced.
Check if the gas valve settings are correct and adjust if necessary.
Check if the air supply to the boiler is free from obstruction.
Cause:
Flame, but not enough ionisation to establish the flame.
Corrective Action:
Check the condition of the ignition electrode and clean/replace if necessary.
Check the condition of the ceramic insulator. Replace electrode if any sign of damage is present.
Check the distance between the electrode pin, earth pin and burner.
Check the condition of the ignition cable and replace if necessary.
Check the condition of the earth wire/connection of the ignition electrode and replace if necessary.
Check for correct electrical earthing of the boiler.
Check the incoming power supply. The supply voltage must be 230 VAC 50Hz 1Ph.
Check the condition of the electrode cap and replace if necessary.
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