© The Fulton Companies 2014
MAINTENANCE
FBW-IOM-2014-0311
SECTION 4
4-4
Troubleshooting
Use the following table as a guide to troubleshooting your boiler.
Problem
Check
Unit Does Not Run
Check fuse or circuit breaker. Use a multimeter to check voltage across the fuse. If power is off,
remove fuse from fuse holder and check with multimeter or continuity light to see if there is a
break in the fuse.
Reset or replace, as necessary.
Ensure unit is on.
Water Level too low. Check supply water.
Outlet temperature over the setpoint. Check water fl ow and setpoint controller.
Fuse is Blown
1. If power is on use a multi meter to check voltage across the fuse.
2. If power is off remove fuse from fuse holder and check with a multi meter or continuity light to
see if there is a break in the fuse.
3. If a break is detected – shut off power and remove fuse with a fuse puller. Replace with a
new fuse of the same voltage and amps. Turn power on.
Control Circuit Failure
1. If control circuit failure is suspected, trace the wiring diagram through each component with a
multi meter to verify power in each stage or that component is supplied.
2. If part of the voltage is stopped at any point, replace that component and continue the test
until all circuits test clear.
Control Switch Fails to Oper-
ate
1. Turn off power.
2. Remove all wires from switch terminals.
3. Check all terminals for looseness or corrosion.
4. To test for proper make or break of circuit, use a multimeter or continuity light. If bad, replace
using adjustable wrench and screwdriver.
Faulty Low Water Safety
Relay
1. With a multi meter check power on #1 terminal to see if power is coming to the relay. If it is,
continue through the relay verifying circuit power to each part of the control.
2. If it is faulty, replace.
Faulty Probe
1. Check wire to probe. If the wire is suspected to be bad, shut off the power and check the wire
with a continuity light.
2. If probe is dirty, clean with very fi ne sandpaper or emery paper and replace into boiler.
Faulty Element Thermostat
1. If power is on, check across thermostat with a volt meter to verify power going through the
switch on all points.
2. If power is off, read across contactors on switch with a continuity light to verify switch is not
breaking down.
3. If the thermostat is bad replace it by using a fl at-head or Phillips head screwdriver.