15
3.6 Troubleshooting
Refer to burner manufacturer’s IOM for additional troubleshooting information.
Symptom Cause
Remedy
A. Burner motor does not operate.
1. Low or no voltage.
2. Fuse(s)
blown.
3. Customer’s interlock not closed
or connected.
4. Burner “Manual / Auto” switch in
“Off” position.
5. Safety and limit circuits open.
6. Ignition control not closed.
7. Overload protection on motor or
starter tripped.
8. Motor may be defective or
incorrectly wired.
9. Burner relay not closed.
10. Pre-purge timer not closed.
1.
Check power source.
2. Replace
fuse(s).
3.
Close or connect customer
interlock.
4.
Place switch in “Manual /
Auto” position.
5.
Close safety and limit
circuits.
6.
Check for power or replace.
7.
Reset the motor or starter and
check amps.
8.
Turn power off and check
power and wiring.
9.
Check for power or replace.
10.
Check for power or replace.
B. No voltage at flame safeguard
relay input terminals.
1.
See burner motor does not
operate Cause 1,2,3,4,5, & 10.
2.
Burner motor air proving switch
open.
1.
See burner motor does not
operate Remedy 1,2,3,4,5, & 10.
2.
Check for correct rotation
and or adjustment of switch.
C. Flame safeguard relay goes into
safety shutdown (Lockout).
1. See technical data sheets on
flame safeguard relay.
1. Determine the cause of lockout.
Reset the flame safeguard relay.
D. Pilot does not light after pre-
purge has timed out and voltage
is present on flame safeguard
output terminals.
1.
Manual pilot shut-off valve
closed (if applicable).
2.
Inlet gas pressure lower than
minimum gas pressure required.
3.
No gas through pilot regulator
with sufficient inlet gas pressure
(if applicable).
4. No gas flow through pilot
solenoid valve (if applicable).
5.
Type of gas supplied (natural gas
or propane) different than shown
on unit rating plate.
6.
Flame detection system not
sensing pilot flame. (See section
for servicing burner).
7. No voltage on secondary side of
ignition transformer.
1. Slowly open valve.
2. Increase gas pressure.
3. Clear obstruction in vent orifice
or line, replace if defective.
4. Check for proper installation, and
voltage. Correct or replace if
defective.
5. Connect to proper fuel supply of
contact factory for field
conversion parts.
6a. U.V. Sensor – Clean lens, check
wiring and spark rod.
6b. Flame Rod - Assure rod is in
pilot flame, check wiring, and
flame rod.
7. Check wiring. Replace transformer
if defective.