Fault finding and diagnosis
Greenstar 2000 – 6 721 820 552 (2021/02)
74
11.2 Fault code table
Fault
code
Fault
category
Description Remedy
200 O Boiler in heating mode Operating message, is not a fault.
201 O Boiler in hot water mode Operating message, is not a fault.
202 O Boiler in anti-cycle mode Operating message, is not a fault.
203 O Boiler in standby, no heat energy demand Operating message, is not a fault.
204 O Current prim. water temp. higher than set
val.
The actual boiler water temperature is higher than the target boiler water temperature. The
boiler is switched off.
208 O Chimney sweep demand Operating message, is not a fault.
212 – Rise in temp. of safety or heating flow
sensor too fast
Open the shut-off valves.
214 V Fan shut down during safety time ▶ Reset the appliance.
▶ Create a heat demand; check if the boiler fires up.
▶ Check the voltage to the fan and the continuity of the fan harness.
▶ Check the power modulation on the fan.
▶ PCB may be defective.
215 V Fan shut down during safety time ▶ Replace fan.
▶ Mains voltage must correspond to the default value.
▶ Check PCB and fan harness, replace if necessary.
224 B/V Safety temp. limiter has tripped ▶ Check if lead is disconnected from the safety temperature limiter.
▶ Check the high limit of the safety temperature limiter and the harness for continuity.
▶ Check the flow temperature to confirm actual temperature (may have tripped out at
lower temperature, leading to safety temperature limiter fault)
▶ Check the system pressure and top up as required.
▶ Check if air is trapped in the system and in the boiler.
▶ Pump seized/not running: check the pump for failure or blockage.
▶ Check if blockage/restriction within boiler/pipe work restricting the flow.
227 B/V No flame signal after ignition Tip: Check the ceramic insulator is not damaged, this can cause the spark to earth, twist
and pull the ceramic insulator to ensure it is not broken.
▶ Check the gas supply to property and the inlet on the gas valve.
▶ Check the low pressure when the gas valve opens.
▶ Gas valve failing to open: check for voltage to the valve and for possible blockage on
inlet filter of the gas valve.
▶ Obstruction in the air intake to the fan leading to incorrect CO
2
ratio. Diaphragm is
damaged or stuck.
▶ Condensate trap is blocked or restricted. Condensate pipe is frozen.
▶ Flue is blocked or restricted.
▶ Heat exchanger is blocked or restricted.
▶ Check the burner for damage.
▶ Check the spark electrode or the lead failure.
▶ Check the flame sense or the lead failure.
▶ Check the rectification ground (black wire to heat exchanger).
228 V Flame signal without flame present Tip: Check the ceramic insulator is not damaged, this can cause the spark to earth, twist
and pull the ceramic insulator to ensure it is not broken.
▶ Check the flame sense and the lead and replace if required.
▶ Check the earth tags on the boiler and on the electrodes.
▶ Check the operation of the siphon and no water collecting in the sump.
▶ Replace the air and/or gas ratio control valve.
▶ Replace the control unit and/or burner control unit.
229 B Flame failed during burner operation Tip: Check the ceramic insulator is not damaged, this can cause the spark to earth, twist
and pull the ceramic insulator to ensure it is not broken.
▶ Check the gas supply to the property and check the working pressure on the gas valve
inlet.
▶ Check the gas-air ratio.
▶ Check the ionisation electrode and the harness for damage or contamination.
▶ LPG: Sufficient gas in the tank or recently refilled?
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