Worcester Greenstar Heatslave II 12/18, Installation, Commissioning & Servicing Instructions

Page: 43 / 56

Fault finding and diagnosis
Greenstar Heatslave II External ErP - 6 720 813 345 (2014/09) 43
8.4.3 Cause and 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 FO 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.
Table 15 Cause and fault codes
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)
Table 16 H fault codes