MODENA 80 E
33
In order, the fi ve lights indicate:
1
Boiler On Indicate
2
Boiler Shut down warning
3
Domestic Hot Water circuit ON
4
Central Heating standby (Flashing Light)
Central Heating circuit ON (Permanent Light)
5
Insuffi cient pressure in Central Heating System (Flashing Light)
Electric power supply ON (Permanent Light)
Note:
Always check for suffi cient gas supply (20mbar inlet working pressure for NG and 37mbar for LPG).
Minimum of 22 mm diameter pipework on C.H. fl ow and return with adequate by-pass. A correctly installed
fl ue system and a 3 amp fuse.
8.03 MF03 PCB
When operating the C.H. the following lights should be on: 4, 5 and fl ame on light. For D.H.W. the following
lights should be on: 3, 5 and fl ame on light.
If the boiler works for C.H. but not D.H.W., or vice versa, a number of components must be functioning and
can, therefore, be eliminated as being at fault.
Boiler will not light for D.H.W.
If boiler works for C.H. but not for D.H.W. the fault is most likely to be the fl ow meter or D.H.W. sensor.
If the tap symbol light is on the fault is the D.H.W. sensor. If this light is not on then suspect the fl ow
meter has not operated.
Boiler will not light for C.H.
If the boiler works for D.H.W. but not for heating the fault is most likely to be external controls (i.e. clocks or room
thermostats). Integral clock if fi tted or C.H. sensor.
If the heating demand light is on the fault is most likely the C.H. sensor. If this light is not on suspect either
a clock or room thermostat not calling.
To override/eliminate any external controls disconnect them from terminal 3 and 4 underneath the boiler
and refi t the link wire (see fi g. 26).
Boiler will not light for D.H.W. or C.H.
The fault is likely to be a component common to both services. Open a hot tap to create a demand - is
there a spark at the ignition electrode?
Yes
Suspect gas supply, pressure or gas valve.
No
Is fan running?
Yes
Suspect air pressure switch or overheat stat (if boiler locks out without sparking go to overheat stat)
No
Is low water pressure light Flashing?
Yes
Top up water to above 1 bar. Does the light go out? (if water pressure o/k suspect high limit stat)
Yes
Does fan start?
Yes
Does boiler light?
Yes
Is hot water OK?
Try heating, if heating does not work follow guide for heating faults. Does low water pressure light
go out?
No
Suspect low water pressure switch.
If boiler still does not fi re see comprehensive fault fi nding chart.
