Instructions for Use, Installation and Servicing ecoMAX pro 35
16 Fault finding
16.3 Fault Codes
Fault codes take priority over all other display functions
in the event of a system fault occurring.
Code Description Comment
F1 Ignition fault (lockout) No gas; Insufficient gas; Incorrect gas valve adjustment; Electrode defect;
Failed to light Ignition lead defect; Electronic igniter defective; Check air inlet duct;
Check connections to igniter unit
F4 Ignition fault (lockout) As above
Went out when lit
F5 Overheat fault Overheat stat operated; Maximum temperature exceeded;
Check thermistor connections; Air in system with thermistor at maximum
setting; Faulty overheat stat connection; Check that pump is wired into
appliance and not from programmer. This would cause no pump overrun
F6 Central heating flow NTC fault Flow NTC cable defective/broken NTC faulty
Flow thermistor not fitted correctly, Check pipe work configuration
F10 Central heating return NTC fault Return NTC cable defective/broken NTC faulty
Check that thermistor attached correctly to pipe.
F11 No reception by main board Connection fault between main PCB and interface; Faulty interface;
Faulty main PCB (processor), Check fan
F12 No reception by the local user interface As F.11
F13 Main board fault As F.11
F14 Central heating flow t° > 95° C System fault; Possible external pump failure; Check NTC on flow
Check that pump is wired into appliance and not from programmer.
This would cause no pump overrun
F16 Flame detection fault
(flame presence >5 s after burner stop) Gas valve defective
F17 Power supply <170 V Check electrical supply / polarity, Check fan
F18 Local user interface fault Connections; Faulty interface
F19 Central heating NTC unplugged Check NTC connection
F20 MMI software incompatible with IRIS software Possible connection fault
F24 Central heating return t° >90°C System fault; Possible external pump failure; Check NTC on return;
Check that pump is wired into appliance and not from programmer.
This would cause no pump overrun.
F25 Maximum temperature rise slope Possible external pump failure; Air in system restricting movement of water.
Insufficient circuit flow
F26 Maximum delta t Check NTC on return; System fault – too restrictive?; Possible pump failure
16.2 Fault Memory
The fault memory stores details of the five most recent
faults. To display the fault memory, proceed as follows;
• With the interface in ‘normal’ mode, press and hold the
‘mode’ button (
) for 10 seconds until a flashing ‘0’
appears.
• Press the ‘mode’ button again.
• The 5 fault memory screens are now available to be
viewed, memory 1 being the most recent. Within each
memory screen, 5 additional screens provide further
information to assist the installer/engineer.
To cancel the fault memory mode proceed as follows;
• Press and hold the ‘mode’ button for 10 seconds until
the screen returns to the ‘user’ mode.
No. Memory screen type Comments
1 Fault code Fault code 1 – 26 (see page 31 – ‘Fault finding’)
2 Burner phase Working phase
3 DHW temperature No function
4 CH flow temperature °C at time of fault
5 Tank temperature No function
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