Fault finding and diagnosis
Greenstar i System
ErP
- 6 720 806 945 (2015/07)
67
Gas valve fault
FA
306
Ionisation detected after the gas valve
closed.
▶ 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.
Ignition/Ionisation fault
EA
227
No ionisation detected after ignition
▶ 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.
Ignition/Ionisation fault
F7
228
Ionisation current detected before burner-
start
▶ Check:
– Condition of the ionisation probe.
– Connection of the ionisation probe.
– Condensate is discharging correctly.
– Replace parts if necessary.
Ignition/Ionisation fault
EA
229
Loss of ionisation signal during operation
▶ Check:
– The gas-air ratio.
– The dynamic gas.
– Wiring and connection of flame probe.
– Replace flame probe necessary.
Ignition/Ionisation fault
EA
261
HCM potentially defective
▶ Reset the appliance.
If continues to go to this error
▶ Check:
– HCM is inserted properly.
– HCM number.
▶ Contact technical helpline.
Internal error
9U
233
Control box or HCM is defective or loose
▶ Check:
– HCM is inserted properly.
– Replace HCM if necessary.
– Connections of the control box.
▶ Replace control box if necessary.
Internal error
C4
237
Control box or the HCM is defective.
▶ Check:
– HCM is inserted properly.
– Replace HCM if necessary.
– Connections of the control box.
▶ Replace control box if necessary.
Internal error
F0
238
Gas valve or control box error
▶ 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.
Internal error
F0
239
Control box or the HCM is defective.
▶ Check:
– HCM is inserted properly.
– Replace HCM if necessary.
– Connections of the control box.
▶ Replace control box if necessary.
Internal error
F0
242 -
256
Control box or the HCM is defective.
▶ Check:
– HCM is inserted properly.
– Connections of the control box.
▶ Contact technical helpline.
Display text
Fault
code
Cause
code
Description
Possible solution/check
Table 49
