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Troubleshooting
Excessive vibration Dirty or worn check valves See “Dirty or worn check valves.”
Scored plungers Abrasive material in uid being
pumped.
Install proper ltration on pump inlet plumbing.
Fitted plungers Cavitation. Decrease inlet water temperature and/or increase inlet
water pressure.
Cavitation High inlet uid temperature, low
inlet pressure.
Lower inlet uid temperature and raise inlet uid
pressure.
Trouble Possible Cause Remedy
Burner will not ignite Electrodes out of alignment. See “ADJUSTING ELECTRODE ASSEMBLY” in
BURNER MAINTENANCE SECTION.
Electrode insulator failure. Remove and replace if there are breaks, cracks,
or spark trails.
Water ow switch not closing. Adjust, repair, or replace switch.
Vacuum switch not closing. Adjust, repair, or replace switch.
Temperature control switch not closing. Adjust or replace the TEMPERATURE CONTROL.
Fuel solenoid valve not opening. Clean, repair, or replace solenoid.
Weak transformer. Clean and check transformer terminals. Check
transformer for spark pre “TRANSFORMER
TEST” in BURNER MAINTENANCE SECTION.
Faulty cad cell (if equipped). Clean and test cad cell, replace if required.
Faulty primary control (if equipped). Replace primary control.
Burner motor thermal protector locked
out.
See “Burner motor thermal protector locked out.”
Wiring. All wire contacts are to be clean and tight. Wire
should not be cracked or frayed.
Burner switch. Test switch operation. Remove and replace as
necessary.
Pump pressure. See “Low fuel pressure.”
Venting. A downdraft will cause delayed ignition. Soot
deposits on the coil and burner can interrupt air
ow, and cause shorting of the electrodes. Clean
as required.
Sooting. Soot deposits on the coil and burner can interrupt
air ow, and cause shorting of the electrodes.
Clean as required.
No fuel. See “No fuel.”
Burner
Pump Troubleshooting Continued
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