Cause And Fault Codes - Worcester Greenstar Heatslave II 12/18 Installation, Commissioning & Servicing Instructions

8.4.3

Cause and fault codes

Cause Fault
code code Description
210 E9 Max temperature thermostat activated
212 No Safety or flow temperature rises too high
code
218 E5 Flow temperature too high
219 E9 Safety temperature too high
220 E9 Safety sensor short circuit
221 E9 Safety sensor open circuit
222 E2 Flow sensor short circuit
223 E2 Flow sensor open circuit
233 E2 HCM (Heat Control Module)
237 F0
238 F0
239 F0 Watchdog error
259 FO AD reference error
263 F0 Appliance powered off with locking fault
present
271 D4 Temperature difference between flow
and safety sensors exceeds limit
276 E9 Flow temperature exceeds 95°C
277 E9 Safety temperature exceeds 95°C
278 F0 Sensor test error
279 F0 AD converter error
290 F0 AD converter reference error
332 E5 Primary flow has exceeded 105°C
359 No DHW outlet or storage tank exceeds 90°C
Code
360 9A Incorrect HCM for boiler variant
380 No Inlet DCW temperature higher than DHW
code outlet temperature
808 A7 DHW sensor defective
809 A0 Thermal store sensor defective
855 9F Burner lock out
856 9F 5 burner lockouts repeated resets
Table 15 Cause and fault codes
H code Displayed symbols
H03 Warning triangle and House symbol displayed on controller
H11 Warning triangle symbol displayed on controller
Table 16 H fault codes
Greenstar Heatslave II External ErP - 6 720 813 345 (2014/09)
Reset
type Blocking Locking
Reset Flue gas or tank thermostat overheat. Reset the overheat
X
thermostat before resetting the appliance.
X
Air lock or reduced water content.
X
Reset Primary sensor overheated.
X
Reset The main heat exchanger has overheated.
Maximum temperature 105°C.
X
Reset Maximum temperature sensor on the main heat exchanger has
failed.
X
Reset Maximum temperature sensor on the main heat exchanger has
not been recognised.
X
Reset Flow sensor shorted or damaged.
X
Reset Flow sensor disconnected or damaged.
X
Reset HCM Code plug missing or defective.
Resistors between plug X4 pins 3 & 5 disconnected/>150k 
X
Reset
or water in the burner control box
Resistors between plug X4 pins 3 & 5 disconnected/>150k 
X
Reset
or water in the burner control box
X
Reset
X
Reset
X
Reset Locking fault present when powered off.
X
The temperature of the primary flow and the safety sensor on
the main heat exchanger should be within 15°C of each other.
X
Primary overheat - boiler waits for temperature to reduce,
approximately 30 minutes.
X
Main heat exchanger safety sensor overheat - boiler waits for
temperature to reduce, approximately 30 minutes.
X
Reset On power up, all safety sensors are checked. Check has failed.
X
Reset
X
Reset
X
Reset Primary sensor overheated.
X
Pump & burner are blocked until temperature drops to <89°C.
X
X
The output is blocked until the inlet temperature drops below
the output temperature.
X
Reset
X
Reset
X
Reset Check the burner and fuel supply. Ensure the oil supply is free
of contaminants.
X
Turn After Five 855 burner lock outs in one demand period, cause
boiler code 856 is displayed.
off/on 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.
Cause
Weather compensation activated but no weather sensor detected,
refer to section 5.11 on page 24 for more information.
DCW in sensor defect, (appliance operation not affected)
Fault finding and diagnosis
Possible cause
43