Worcester Greenstar i System ErP Series Installation, Commissioning And Servicing Instructions page 67

Fault
Display text code
Gas valve fault FA
Ignition/Ionisation fault EA
Ignition/Ionisation fault F7
Ignition/Ionisation fault EA
Ignition/Ionisation fault EA
Internal error 9U
Internal error C4
Internal error F0
Internal error F0
Internal error F0
Table 49
Greenstar i System - 6 720 806 945 (2015/07)
ErP
Cause
code Description
306 Ionisation detected after the gas valve
closed.
227 No ionisation detected after ignition
228 Ionisation current detected before burner-
start
229 Loss of ionisation signal during operation
261 HCM potentially defective
233 Control box or HCM is defective or loose
237 Control box or the HCM is defective.
238 Gas valve or control box error
239 Control box or the HCM is defective.
242 - Control box or the HCM is defective.
256
Fault finding and diagnosis
Possible solution/check
▶ Inspect the ionization probe, replace if necessary.
▶ Check that the condensate is discharging.
▶ Check 230Vac across blue & orange wires to the coils.
– Replace gas valve if no voltage.
– Replace control box if there is voltage.
▶ Check:
– The dynamic gas pressure.
– The flue system for restrictions.
– The gas-air ratio (if possible).
– Connectors of the ignition unit.
– Ignition and ionisation current.
– Ignition unit for damage or wear, replace if
necessary.
– Gas valve operation.
– Appliance for contamination.
▶ Check:
– Condition of the ionisation probe.
– Connection of the ionisation probe.
– Condensate is discharging correctly.
– Replace parts if necessary.
▶ Check:
– The gas-air ratio.
– The dynamic gas.
– Wiring and connection of flame probe.
– Replace flame probe necessary.
▶ Reset the appliance.
If continues to go to this error
▶ Check:
– HCM is inserted properly.
– HCM number.
▶ Contact technical helpline.
▶ Check:
– HCM is inserted properly.
– Replace HCM if necessary.
– Connections of the control box.
▶ Replace control box if necessary.
▶ Check:
– HCM is inserted properly.
– Replace HCM if necessary.
– Connections of the control box.
▶ Replace control box if necessary.
▶ Check:
– Gas valve coils:
230V ac across blue & orange wires.
– Replace gas valve if necessary.
– Connections of the control box.
▶ Replace control box if necessary.
▶ Check:
– HCM is inserted properly.
– Replace HCM if necessary.
– Connections of the control box.
▶ Replace control box if necessary.
▶ Check:
– HCM is inserted properly.
– Connections of the control box.
▶ Contact technical helpline.
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