Find Your Error Code
Why does the Greenstar I have so many error codes?
The Greenstar I by Worcester Bosch is a "Smart Boiler". This boiler has more sensors and electronic inputs which lets it provide us with a more accurate description of what is going on. Unlike have 1 error code which may cover many issues, the Greenstar I has an error code for everything. This helps us diagnose problems fatser and saves you money!
Error Code: 226
Cause:
Service tool has been connected in the blocking error history menu.
Difficulty:
1 2 3 4 5
Engineer:
Required
Solutions To Try:
Service menu option.
Error Code: FD 231
Cause:
The power has been interrupted during a lockout.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Site visit required.
Error Code: C7 214
Cause:
Fan does not run during the start up phase.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Fan harness connector needs checking and leads need checking.
Error Code: C6 215
Cause:
Fan speed too high.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Test fan, harness and leads.
Error Code: C7 216
Cause:
Fan speed too low.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Test fan, harness and leads.
Error Code: C7 217
Cause:
Fan has stopped during appliance operation.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Test fan, harness and leads.
Error Code: C1 264
Cause:
Fan stopped during operation.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Test fan, harness and leads.
Error Code: C4 273
Cause:
Continuous fan operation for the last 24 hours.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Enginner to check fan and PCB.
Error Code: E2 222
Cause:
Flow temperature sensor shorted.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Check for blockages.
Error Code: E2 233
Cause:
Flow temperature sensor disconnected.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Check lead and connections on sensor.
Error Code: E9 276
Cause:
Primary flow temperature exceeded 95°c.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Heat exchange or appliance blocked. Engineer to test pump.
Error Code: E2 350
Cause:
Flow temperature sensor shorted.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Engineer to check sensor and leads.
Error Code: E2 351
Cause:
Flow temperature sensor disconnected.
Difficulty:
1
2 3 4 5
Engineer:
Required
Solutions To Try:
Engineer to check sensor and leads.
Error Code: FA 306
Cause:
Ionisation detected after the gas valve closed.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check ionisation probe, leads and gas valve.
Error Code: EA 227
Cause:
No ionisation detected after ignition.
Difficulty:
1
2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check ionisation probe, leads and gas valve.
Error Code: F7 228
Cause:
Ionisation current detected before burner start.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check ionisation probe, leads and gas valve.
Error Code: EA 229
Cause:
Loss of ionisation signal during operation.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check ionisation probe, leads and gas valve.
Error Code: EA 261
Cause:
Heat control module (HCM) potentially defective.
Difficulty:
1 2 3
4 5
Engineer:
Required.
Solutions To Try:
Site visit required by engineer.
Error Code: 9U 233
Cause:
Control box or heat control module (HCM) is defective or loose, the HCM needs to be checked.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Check HCM.
Error Code: C4 237
Cause:
Control box or heat control module (HCM) is defective.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Check HCM.
Error Code: F0 238
Cause:
Gas valve or control box error.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check gas valve.
Error Code: F0 239
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Check HCM.
Error Code: F0 242
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Check HCM.
Error Code: B7 257
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: F0 258
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: EH 258
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: F0 262
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: F1 259
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: F1 263
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: F0 272
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: F0 280
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: F0 290
Cause:
Control box or the heat control module (HCM) is defective.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: 328
Cause:
Internal error with the mains voltage.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check electrical connections.
Error Code: 235
Cause:
Incompatible heat control module (HCM) software versions.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Control box needs latest software.
Error Code: 360
Cause:
Heat control module (HCM) invalid.
Difficulty:
1 2 3 4
5
Engineer:
Required
Solutions To Try:
Engineer to check HCM
Error Code: 356
Cause:
Low mains voltage.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
The voltage may be interrupted or inconsistent and needs checking.
Error Code: A8 362
Cause:
Low mains voltage.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
The voltage may be interrupted, inconsistent or heat control module (HCM) invalid.
Error Code: A1 281
Cause:
Pump stuck or running dry.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Engineer to check pump and for air in system.
Error Code: D4 341
Cause:
Primary flow temperature rising too fast.
Difficulty:
1 2 3
4 5
Engineer:
Required
Solutions To Try:
Check for blockages and air in system.
