FULTON VSRT Series Installation And Operation Manual page 84

4 - MAINTENANCE & TROUBLESHOOTING
Problem
Burner Cut-Off
Water pump will
not come on at
times
Low fuel
pressure
Boiler Flooding
4-24
VSRT_IOM_2018-1213
Troubleshooting Gas Fired Boilers
Cause
Power Supply
Gas Supply
Ignition Electrodes
Air Switch
Dirty or defective UV Scanner Clean or replace.
Scale on probes
Bad pump contactor
Bad pump motor
Gas Pressure Regulator
Pump does not shut off
Relay failed
Ground Connection
Vacuum created with boiler
off
Remedy
Check fuse or circuit; reset or replace, as necessary.
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.
Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment. Readjust if necessary. Check
for cracks in porcelain; if found replace.
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.
Check and clean or replace as necessary.
Check to see if contactor is being powered. Check
to see if contactor coil is pulling in. Replace if
necessary.
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.
Check and replace.
Dirty probes. Clean or replace as necessary.
Make sure relay is plugged in tightly. If so, replace
water level relay.
Check for tightness and clean.
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.
© Fulton 2018