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  • Worcester Greenstar Heatslave 11 Boiler Fault Codes

Worcester Greenstar Heatslave 11 Boiler Fault Codes

Cause

Code

Fault 

Code

 Description

Reset

Type

 Blocking Locking Possible Cause

210

E9

 Max temperature thermostat activated

Reset

 X Flue gas or tank thermostat overheat. Reset the overheat thermostat before resetting the appliance

212

No code

 Safety or flow temperature rises too high

 

 X Air lock or reduced water content.

218

E5

 Flow temperature too high

Reset

 X Primary sensor overheated.

219

E9

 Safety temperature too high

Reset

 X The main heat exchanger has overheated. Maximum temperature 105°C.

220

E9

 Safety sensor short circuit

Reset

 X Maximum temperature sensor on the main heat exchanger has failed.

221

E9

 Safety sensor open circuit

Reset

 X Maximum temperature sensor on the main heat exchanger has not been recognised.

222

E2

 Flow sensor short circuit

Reset

 X Flow sensor shorted or damaged.

223

E2

 Flow sensor open circuit

Reset

 X Flow sensor disconnected or damaged.

233

E2

 HCM (Heat Control Module)

Reset

 X HCM Code plug missing or defective.

237

F0

Reset

 X Resistors between plug X4 pins 3 & 5 disconnected/>150k  or water in the burner control box

238

F0

Reset

 X Resistors between plug X4 pins 3 & 5 disconnected/>150k or water in the burner control box

239

F0

 Watchdog error

Reset

 X

259

F0

 AD reference error

Reset

 X

263

F0

 Appliance powered off with locking fault present

Reset

 X Locking fault present when powered off.

271

D4

 Temperature difference between flow and safety sensors exceeds limit

 

 X The temperature of the primary flow and the safety sensor on the main heat exchanger should be within 15°C of each other.

276

E9

 Flow temperature exceeds 95°C

 

 X Primary overheat - boiler waits for temperature to reduce, approximately 30 minutes.

277

E9

 Safety temperature exceeds 95°C

 

 X Main heat exchanger safety sensor overheat - boiler waits for temperature to reduce, approximately 30 minutes.

278

F0

 Sensor test error

Reset

 X On power up, all safety sensors are checked. Check has failed.

279

F0

 AD converter error

Reset

 X

290

F0

 AD converter reference error

Reset

 X

332

E5

 Primary flow has exceeded 105°C

Reset

 X Primary sensor overheated.

359

No code

 DHW outlet or storage tank exceeds 90°C

 

 X Pump & burner are blocked until temperature drops to <89°C.

360

9A

 Incorrect HCM for boiler variant

 

 X

380

No code

 Inlet DCW temperature higher than DHW outlet temperature

 

 X The output is blocked until the inlet temperature drops below the output temperature.

808

A7

 DHW sensor defective

Reset

 X

809

A0

 Thermal store sensor defective

Reset

 X

855

9F

 Burner lock out

Reset

 X Check the burner and fuel supply. Ensure the oil supply is free of contaminants.

856

9F

 5 burner lockouts repeated resets

Turn boiler off/on

 X After Five 855 burner lock outs in one demand period, cause code 856 is displayed. After boiler off/on cause code 263 will be displayed, press the reset button to clear this fault. another 5 burner lock resets can be attempted.
 H Code Displayed Symbols Cause
H03 Warning triangle and House symbol displayed on controller Weather compensation activated but no weather sensor detected, refer to section 5.11 on page 24 for more information.
H11 Warning triangle symbol displayed on controller DCW in sensor defect, (appliance operation not affected)