Troubleshooting
6-2
750-96 (revised 2010)
Model CB Packaged Boiler Manual
Costly downtime or delays can be prevented by systematic checks of the actual operation against the normal
sequence to determine the stage at which performance deviates from normal. Following a routine may possibly
eliminate overlooking an obvious condition, often one that is relatively simple to correct.
If an obvious condition is not apparent, check the continuity of the circuits with a voltmeter or test lamp. Each cir-
cuit can be checked and the fault isolated and corrected. Most circuitry checking can be done between appropri-
ate terminals on the terminal boards in the control cabinet or the entrance box. Refer to the schematic wiring
diagram for terminal identification.
Problem Possible Cause(s)
BURNER DOES NOT
START
1. No voltage at program relay power input terminals.
A. Main disconnect switch open.
B. Blown control circuit fuse.
C. Loose or broken electrical connection.
2. Program relay safety switch requires resetting.
3. Limit circuit not completed - no voltage at end of limit circuit program
relay terminal.
A. Pressure or temperature is above setting of operation control.
(Load demand light will not glow.)
B. Water below required level.
1) Low-water light (and alarm horn) should indicate this condition.
2) Check manual reset button (if provided) on low-water control.
C. Fuel pressure must be within settings of low pressure and high
pressure switches.
D. Oil fired unit - burner gun must be in full forward position to close oil
drawer switch.
E. Heavy oil fired unit - oil temperature below minimum settings.
4. Fuel valve interlock circuit not completed.
A. Fuel valve auxiliary switch not enclosed.
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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