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4.Explanation of Self-Diagnostics
The FEB-24E has a built in self diagnostic fault finding system incorporated into the P.C.B.
Should a fault develop on the boiler which could cause an unsafe situation the boiler will
“fail safe”. It does this by suspending all operations or “locking-out” and displaying a fault
code via the 'red LED' on the control panel.
The fault can be identified by the different sequences in which the 'red neon' flashes and
the duration that the neon stays illuminated. The electronic fail safe is also backed by a
mechanical means of protection, should the electronics fail to detect a fault. These
mechanical forms of protection will protect and ensure the safe shut down of the boiler.
The software protection built into the P.C.B. will run a system check on components which
are essential to the safe operation of the boiler. This occurs before any ignition sequence
takes place. If any component is found to be faulty or out of a predetermined range, then
lock-out will be displayed.
Each fault code begins and finishes with the 'red LED' illuminated for 5 seconds, the
relevant fault is then indicated by the number of 1 second flashes which occur between the
initial 5 second flash and the closing 5 second flash. These range from 0 - 12. Please be
patient when counting the sequence as the correct identification of the fault will save time
on isolating and rectifying the problem.
E.g.: Fault 6 water overheating would display the following sequence of the red LED;
5 seconds 1 sec 1 sec 1 sec 1 sec 1 sec 1 sec 5 seconds
N.B. The sequence repeats until either the boiler has been reset or the fault rectified.
Some faults require the component temperature to return within operating range before
resetting automatically. Some sequences may take up to 3 minutes before lock-out is
displayed, e.g. air pressure switch failure fault 1.
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