74
Faults and Fault Finding
The fault display
The unit carries out a number of internal and external checks during operation. If a fault is found, a
fault number is used to identify the type of problem. A list of fault numbers may be found later in this
chapter.
Depending on the type of fault, the unit may perform a safety shutdown of the burner and/or activate
the alarm relay (activation of the alarm relay is determined by option parameter 10.1).
Fault description
Many of the faults detected and displayed by the unit will cause a safety shutdown of the burner.
Other faults will be displayed as a warning but operation of the burner will not be affected.
All fault numbers are prefixed by a letter. This letter describes the status of the fault:
F
- This means that a fault has occurred (e.g. PSU calibration fault) and is
still present. The fault may be internal or external to the unit.
L
- This means that an alarm limit fault has occurred (e.g. smoke level
exceeding the high limit) and is still present.
C
- This means that a fault or alarm limit did occur but has now cleared.
For example:
F60
- Means fault 60 has occurred and still exists.
L75
- Means alarm limit 75 has been exceeded and is still being exceeded.
C73
- Means fault or alarm limit 73 has occurred but has subsequently cleared.
When the unit is in a safety shutdown state both the controlled shutdown triac and safety shutdown
relay will be turned off, to prevent the burner from firing.
What to do if a fault occurs
To cancel the alarm relay, briefly press the
FAULT MUTE
key, if no display is connected, a separate
FAULT MUTE
switch will be available.
Use the scroll keys to view the
FAULT NUMBER
parameter and look up the fault number(s) shown
to discover why the fault occurred.
If all faults that caused a safety shutdown have cleared, hold down the
FAULT MUTE
key for
approximately three seconds to remove the faults and re-start the burner.
The function of the
FAULT MUTE
key may also be achieved using an AUX input.
Fault subsets
As an aid to fault finding, most faults have a fault subset that gives additional information about the
type of fault or what the burner was doing when the fault occurred. Where applicable, the subsets are
given in the fault listing section. Subsets are viewed using the engineer’s key within the Fireye logo.
