Ferroli OPTIMAX HE 31 S, Instructions For Use Manual

OPTIMAX HE 31 S

28

Cod. 3540F441 - 03/2007  (Rev. 01)

3.4 Troubleshooting

Fault Diagnosis

In the event of operating problems or trouble, the display will flash and a fault identification code 
appears. 
There are faults that in order to restore operation the RESET button must be pressed (ref.6 - fig. 1); or 
if the boiler fails to start, it will be necessary to repair the fault (code nos. F1 to F24). Other faults cause 
temporary shutdowns that are automatically reset as soon as the value comes back within the boiler’s 
normal working range (codes from 25 to 47).
When the boiler starts functioning normally again, the display stops flashing and the fault code disap-
pears.

Fault

Possible cause

Cure

A01

No burner ignition

No gas

Check the regular gas 

fl

 ow to the boiler and the air 

has been purged from the pipes.

Detection or ignition electrode fault

Check that the electrodes are correctly positioned 
and free of any deposits

Defective gas valve

Check and change the gas valve

Incorrect inlet gas pressure

Check inlet gas pressure

Siphon obstructed

Check and if necessary change the siphon

A02

Flame detected with the burner off

Ionisation electrode defective

Check the ionizing electrode wiring

Main board defective

Check the PCB

A03

High limit protection

Flow sensor not active or correctly 
located

Check the correct positioning and operation of the 

fl

 ow sensor

No system circulation

Check the pump and radiator valves present in the 
system and automatic by-pass

A04

Flue gas fault

Fault F07 happened 3 times in the 
last 24 hours

Check the 

fl

 ue

A05

Fan problem

Tachometer signal interruped for 
1 hour

Check the wiring and the fan

A06

No 

fl

 ame after the ignition phase (6 

times in 4 min.)

Detection electrode fault

Check that the electrode is correctly positioned and 
if necessary change it

Flame unstale

Check the burner

Incorrect valve gas Offset

Check Offset at the minimum power

Flue gas circuit obstructed

Check if 

fl

 ue gas circuit is free

Siphon obstructed

Check and if necessary change the siphon

A41

Flow sensor disconnected

Sensor disconnected

Check the correct position and operation of the 

fl

 ow 

sensor

F07

Flue gas fault

The exhaust gases temperature 
becomes higher than 95°C for 2 
minutes longer.

Check the 

fl

 ue

F10

Flow sensor fault

Sensor damaged or short circuited

Check the wiring or change the sensor

Sensor damaged or wiring broken

Check the wiring or change the sensor

F11

Return sensor fault

Sensor damaged or wiring shorted

Check the wiring or change the sensor

Sensor damaged or wiring broken

Check the wiring or change the sensor