FAULT FINDING AND DIAGNOSTICS | 51
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12 FAULT FINDING AND DIAGNOSTICS
12.1 Status codes and faults
The controller monitors all safety, regulation and control components.
Each operating state of the device is supported by a unique status code,
each fault by a fault code.
Detailed troubleshooting is possible using the following tables.
The operation and fault displays are shown as follows:
• Status codes, these show operating states during normal operation
– Status codes can be read during operation using the info menu
(service function i01)
• Blocking faults cause a temporary shutdown of the appliance. The
appliance restarts as soon as the blocking fault has been removed or
rectified.
– Display of blocking faults are with error code and status code
appears on the screen.
• Locking faults are system errors which cause the appliance to
shutdown. The appliance will only restart after a manual intervention
or a reset.
– Locking errors are with error codes and status code flash on the
display.
Fig. 74
[1] Alphanumeric fault code
[2] Service menu function
[3] Status/cause code
12.2 Troubleshooting
12.3 INFORMATION AND SERVICE MENUS
STATUS CODES
During normal boiler operation various Status codes can be displayed by
pressing the button.
The first screen of the Information menu displays the current Status
code, this will change as the boiler runs through the various modes and
sequences.
These are not always faults, but just provide information concerning the
current status of the boiler.
DANGER: Explosion!
▶ Turn the gas supply off before working on gas related
components.
▶ After replacing gas components, seals and gaskets
check for gas tightness using a gas sniffer/analyser.
DANGER: Poisoning!
▶ Check for gas tightness using a gas sniffer/analyser
on gas and flue components.
DANGER: Electric shock!
▶ Before working on the electrical components
disconnect the electrical mains (230 V ac) and
secure against unintentional re-connection.
1
2 3
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WARNING: Scalding!
Hot water can cause serious burns.
▶ Drain the appliance before working on water-
carrying parts.
NOTICE: Water leaks
Water can damage the controller.
▶ Protect from water leaks by covering the controller.
Status
codes
Fault
codes
200 CH System is being heated
201 DHW system is being heated
202 Anti rapid cycle mode
203 System stand by
204 System waiting, primary flow temperature above
setpoint
205 Waiting for airflow
207 CE System pressure too low
208 Test mode active due chimney switch
210 E9 Flue-gas thermostat activated
211 TTB opened (thermal kickback device)
212 Safety or flow temperature rises too fast
213 D4 Temperature difference between supply and return
exceeding limit
214 C7 Fan not running
215 C6 Fan running too fast
216 C6 Fan running too slow
217 C7 No airflow after defined period of time
218 E5 Flow temperature too high
219 E9 Safety sensor temperature too high
220 E9 Safety sensor shorted
221 E9 Safety sensor disconnected
222 E2 Flow sensor shorted
223 E2 Flow sensor disconnected
224 E9 MAX thermostat activated
225 Difference between flow and safety exceeding limit
(bi-sensor only)
227 EA No ionisation detected after ignition
228 F7 Ionisation current detected before burner-start
229 EA Loss of ionisation signal during operation
230 EA Ionisation signal out of bounds
231 FD Mains power error - electrical power interruption
232 D3 external cut-off switch activated
233 9U HCM problem
234 EA Gas valve coil disconnected
237 C4 Airflow present during last 24 hours - fan running
continuously
238 F0 Gas valve error
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