Operating instructions

Table 9—Service Hints
IF SYSTEM IS NOT HEATING OR NOT GIVING ENOUGH HEAT. . .
POSSIBLE CAUSE WHAT TO DO
Thermostat is not set correctly Reset thermostat above room temperature.
Boiler and/or burner may be dirty
Clean all flue passages and vent pipe. Have burner cleaned and
readjusted.
Burner may not be firing at proper rate Check nozzle size it there is any doubt. Have burner adjusted.
Burner may be short-cycling
Burner may be short-cycling Short-cycling (too frequent off and
on) of burner causes sooting. If boiler and/or burner becomes
dirty at frequent intervals, correct the ″dirt condition,″ then also
correct the control setting (or other cause of short-cycling).
Check thermostat heat anticipator and correct setting, if neces-
sary, per instruction sheet packed with thermostat.
No power to boiler
Check overcurrent protection. Check to be sure power supply
circuit is on.
Controls out of adjustment Reset according to instructions packed with controls.
Radiators not heating
Open radiator vents to vent excess air. Check flow control valve
(if used). It may be in closed position.
Circulator pump not running Check relay operation.
Poor electrical contact Check all control terminals and wire joints.
IF BURNER IS NOISY. .
POSSIBLE CAUSE WHAT TO DO
Oil burner fan wheel may be dirty
Clean fan wheel with a stiff brush and cleaning solvent. Readjust
oil burner.
Draft regulator may be stuck Check to see if vane swings freely. Clean if vane is stuck.
IF RADIATORS ARE NOISY. . .
POSSIBLE CAUSE WHAT TO DO
Air in system Open radiator vents to vent air. Check expansion tank.
RELIEF VALVE LEAKING. . .
POSSIBLE CAUSE WHAT TO DO
Dirt on seat Open valve manually. Allow water to run and clear valve seat.
Waterlogged expansion tank Drain tank. See instructions.
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