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11.2
Fault code table
Description
200 O
Boiler in heating mode
201 O
Boiler in hot water mode
202 O
Boiler in anti-cycle mode
203 O
Boiler in standby, no heat energy demand
204 O
Current primary water temperature higher
than set val.
208 O
Chimney sweep demand
213 V
Temp difference between supply and return
exceeding limit
214 V
Fan shut down during safety time
222
V
Interruption of the NTC cabling
223
V
224 B/V
Safety temp. limiter has tripped
227 B/V
No flame signal after ignition
228 V
Flame signal without flame present
Greenstar 1000 – 6721835943 (2023/08)
Remedy
Operating message, is not a fault.
Operating message, is not a fault.
Operating message, is not a fault.
Operating message, is not a fault.
The actual boiler water temperature is higher than the target boiler water temperature. The
boiler is switched off.
Operating message, is not a fault.
▶ Check the flow and return temperature sensor.
▶ Check circulation pump.
▶ 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.
▶ Check the wiring of the flow temperature sensor.
▶ Check if lead is disconnected from the temperature limiter.
▶ Check the high limit of the 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.
▶ Check gaskets/seals for possible flue leakage.
▶ Check HEx for polution.
▶ Check gas-air ratio setting of gas valve.
▶ Review EPM/appliance/XHC.
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 ( Chapter 10.11,
page 69).
▶ 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
prevention valve is damaged or stuck ( Chapter 10.8, page 67).
▶ Condensate trap is blocked or restricted. Condensate pipe is frozen ( Chapter 9.9,
page 58).
▶ Flue is blocked or restricted.
▶ Heat exchanger is blocked or restricted ( Chapter 10.13, page 71).
▶ Check the burner for damage.
▶ Check the ignition electrode or the lead failure ( Chapter 9.10, page 59).
▶ Check the flame sense or the lead failure.
▶ Check the rectification ground (black wire to heat exchanger).
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 condensate trap 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.
Fault finding and diagnosis
ratio. Back flow
2
87
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