MAINTENANCE & TROUBLESHOOTING - 4
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VSRT_IOM_2018-1213
Troubleshooting Gas Fired Boilers
Problem
Cause
Remedy
Ignition Failure
Power Supply
Check fuse or circuit breaker. Reset or replace, as necessary.
Ignition Electrodes
Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment. Readjust if necessary. Check
for cracks in porcelain. If found, replace.
Transformer
Check voltage between transformer leads at terminal block
to be sure transformer is being powered.
Flame Safeguard Control
Check voltage between ignition terminal and neutral.
Check must be made before control locks out on safety. If
no power, replace control.
Faulty Air Switch
Use a volt meter in series with the air switch to check to see
if the switch is making (closing). Also check the adjustment
of the air switch setting. If both above do not work, check
the range of the air switch and measure the burner fan
pressure at the air pressure switch sensing port to make
sure the air switch is within range.
Gas Supply*
Check for gas pressure and for intermittent supply
problems. Gas pressure for natural gas should be 3 in. to
13.8 in. w.c. at the head of the train.
Loose Wire Connection
Check connections to all components.
Flame Failure
Power Supply
Check fuse or circuit breaker. Reset or replace, as necessary.
Gas Supply*
Check for gas pressure and for intermittent supply
problems. Gas pressure for natural gas should be 3 in. to
13.8 in. w.c. at the head of the train.
Ignition Electrodes
Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment.
Readjust if necessary. Check for cracks in porcelain; if found,
replace.
UV Scanner
Check for debris on flame scanner and clean as needed.
Check for proper location of detector.
Flame Safeguard Control
Check voltage at terminal leading to main gas valve. If no
power, replace the control.
Loose wire at fuel valve circuit Tighten wiring connections.
Contact open on air safety
switch
Adjust to proper setting.
Scanner wiring reversed at
panel box
Change to correct terminals.
* For natural gas fired boilers. Refer to the test fire sheet for all other fuels.
Troubleshooting
Refer to table below for troubleshooting.