VMP IOM
43
PROBLEM CAUSE REMEDY
Pump will not cut off 1. Dirty Probes Clean or replace as necessary.
2. Relay failed Make sure relay is plugged in tightly. If so, replace water level relay.
3. Ground Connection Check for tightness and clean.
4. Probes not sensitive enough Replace probes and relays with extra sensitive ones.
(RO/DI Water)
Pump runs but does 1. Vapor locking of pump Allow system to cool down, check steam traps and check to be sure
not put water into boiler return lines are not insulated. Check return tank temp. If it is above
180°F (82°C) vapor locking of pump may occur. Inspect check valves.
Clean and replace as needed. Replace pump with multistage
centrifugal good for 250°F (121°C).
2. Impeller Adjustment Check for impeller wear and adjust per component information in
instruction manual (Burks only).
3. Pump suction plugged Remove/clean inlet strainer.
4. Plugged feed water nipple Check and clean or replace as necessary.
5. Pump undersized/worn Replace with appropriate pump.
3. Back pressure on pump Need to install repair kit on pump.
Water pump will not 1. Scale on probes. Check and clean or replace as necessary.
come on at times 2. Bad Pump Contactor Check to see if contactor is being powered.
Check to see if contactor coil is pulling in. Replace if necessary.
3. 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 1. Gas pressure regulator Check and replace.
Boiler Flooding 1. Pump does not shut off Dirty Probes. Clean or replace as necessary.
2. Relay failed Make sure relay is plugged in tightly. If so, replace water level relay.
3. Ground Connection Check for tightness and clean.
4. 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.
Troubleshooting Gas-Fired Boilers - LE Models
PROBLEM CAUSE REMEDY
Ignition Failure 1. Power Supply Check fuse or circuit breaker. Reset or replace, as necessary.
2. Ignition Electrodes Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustments. Readjust if necessary.
Check for cracks in porcelain. If found, replace.
3. Transformer Check voltage between transformer leads at terminal block to be sure
transformer is being powered.
4. 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.
5. Faulty Air Switch Check for bad air switch by jum pering the two air switch leads at the
terminal block. If the boiler starts and runs with these terminals
jumpered, the air switch should be replaced.
6. Gas Valve Sticking (Pilot) Check for dirt in valve or orifice and clean if necessary.
Check for faulty actuator or valve and replace if necessary.
7. Gas Supply Check for gas pressure and for intermittent supply problems. See test
fire sheet for last elbow.
8. Loose wire connection Check connections to all components.
Main Flame Fails 1. Gas Servo Motor not set properly Verify the last elbow gas pressure matches the start up report.
Adjust gas servo setting.
2. Air Servo Motor not set properly Verify the over burner pressure matches the start up report.
Adjust the air servo motor.
Boiler Fails while 1. Gas Servo Motor not set properly Verify the last elbow gas pressure matches the start up report.
Modulating adjust gas servo setting.
2. Air Servo Motor not set properly Verify the over burner pressure matches the start up report.
Adjust air servo setting.
Maintenance
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