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OVERVIEW OF SETTINGS
6.6 Gas Burner Fault Finding Chart
NOTE:
.
Symptom Possible Cause Action
A. Burner will not start 1. E lectrical supply failure 1. Check:
a. Main isolator switch is on and
power is available at the control
panel.
b. Overload protective devices of
2. Air pressure switch on burner not
operating.
2. Switch contacts must be in the bur-
ner start position. Check switch is
3. Control thermostat, time, water
pressure switches or other boiler
system controls at fault.
3. Check:
That all switches are closed
Booster is not locked out due to low
inlet gas pressure and that pressure
switches function correctly.
4. Reset and check. Also check con-
trol thermostat setting and operati-
on.
B. Burner starts i.e. burner
motor runs but will not
light and burner goes to
‹lockout›.
1. No ignition spark. 1. See action B1.
2. Gas starvation. 2. Purge gas pipe, check pilot valve
operation.
3. Ultra-violet cell fault. 3. Remove, clean and check connec-
tions and replace if necessary.
C. Burner motor starts but
stops and re-cycles.
1. Air pressure switch on the burner. 1. Check:
c. burner damper is open to usual
extent.
d. air inlet to switch is not blocked.
e. switch is not stuck.
f. electrical connection.
D. Burner shuts down du-
ring operation and recy-
cles.
1. As C1 above. 1. As C1 above.
E. Burner shuts down du-
ring operation and goes
to ‹lockout›.
1. Flame failure. 1. Check gas supply and pressure.
2. Ultra-violet cell fault. 2. As B3 above.
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