FAULT FINDING
Any modifications to the installation or component settings resulting from actions suggested below may
require the re-establishment of the various settings as indicated earlier in this manual.
Burner Motor Fails To Start
Check:
•
that the electrical supply is sufficient and the burner is correctly wired.
•
all fuses for continuity and size.
•
all control instruments are “calling for heat”.
•
the gas train is electrically connected.
•
the control box is not locked out (e.g. signal lamp faulty). (If the control box is locked out, press
the reset button).
•
there is sufficient gas pressure.
•
the burner probe is not earthed.
•
the air pressure switch is in the “start” position, as follows: -
Switch off the electrical supply. Remove the plug-in assembly from the control box base. Check for an
open circuit between the air pressure switch terminals.
If there is continuity between terminals, turn the dial on the air pressure switch fully anticlockwise to the
minimum setting. If there is now an open circuit, the air pressure switch is in order, otherwise the air
pressure switch is faulty and must be renewed.
If the air pressure switch isn't in its made position the motor will start for approximately 2 to 3 seconds,
it then will lockout for 10 seconds before attempting a further start. If it is still in the made position a
lockout will occur.
Start Failure Without Ignition
Check:
•
The air pressure switch is set correctly.
•
The electrode is correctly set and the porcelain is not cracked.
•
The ignition transformer is not faulty.
•
The control box is not faulty.
Start Failure Without Flame
If the start flame is not properly established, the safety circuit of the sequence controller will cause
lockout in one second.
The cause may be insufficient signal to the flame detection device. Alternatively the flame signal circuit
may be incomplete, or there is insufficient gas to allow the flame monitoring device to take over and
signal the sequence controller to continue its cycle. This may be remedied by adjusting the fast initial lift
of the downstream safety valve.
Check:
•
The probe is correctly positioned.
•
For bad earth continuity/faulty wiring.
•
The ignition tranformer for crossed polarity.
•
The flame signal circuit is incomplete.
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