4 - MAINTENANCE & TROUBLESHOOTING
© Fulton 2018
4-24
VSRT_IOM_2018-1213
Troubleshooting Gas Fired Boilers
Problem
Cause
Remedy
Burner Cut-Off
Power Supply
Check fuse or circuit; reset or replace, as necessary.
Gas Supply
Check to be sure main gas cock is not closed. Check coil
in gas valve with OHM meter. Replace if faulty. Check gas
regulator setting and readjust as necessary. Check inlet gas
pressure and increase or decrease 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.
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.
Dirty or defective UV Scanner Clean or replace.
Water pump will
not come on at
times
Scale on probes
Check and clean or replace as necessary.
Bad pump contactor
Check to see if contactor is being powered. Check
to see if contactor coil is pulling in. Replace if
necessary.
Bad pump motor
Check the incoming power to the pump to be sure
it is receiving power. If power is present but motor
does not run, replace it.
Low fuel
pressure
Gas Pressure Regulator
Check and replace.
Boiler Flooding
Pump does not shut off
Dirty probes. Clean or replace as necessary.
Relay failed
Make sure relay is plugged in tightly. If so, replace
water level relay.
Ground Connection
Check for tightness and clean.
Vacuum created with boiler
off
As the boiler cools off, it pulls water from the
system piping. To prevent this, add a 1/4” check
valve on the steam gauge assembly piping, which
closes under pressure and opens under vacuum.