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Troubleshooting Tree for Section VII, Step E
WATERLINE ABOVE LOWEST PERMISSIBLE LEVEL?
YES
REPLACE BLOWER AFTER
CHECKING FOR BROKEN
WIRES AND LOOSE
CONNECTIONS.
CHECK DPST RELAY:
24 VOLTS AT COIL?
120 VOLTS AT TERMINALS
'1' AND '3'?
24 VOLTS AT SUCTION
PRESSURE SWITCH
TERMINAL 'C'?
REPLACE RELAY AFTER CHECKING FOR
BROKEN WIRES AND LOOSE CONNECTIONS.
REPLACE SUCTION
PRESSURE SWITCH.
NO
NO
YES
YES
CHECK FOR BROKEN
WIRES AND LOOSE
CONNECTIONS.
YES
24 VOLTS ACROSS BOTH
LIMIT TERMINALS?
NO
REPLACE LIMIT AFTER CHECKING FOR BROKEN
WIRES AND LOOSE CONNECTIONS.
YES
REPLACE RELAY AFTER CHECKING FOR BROKEN
WIRES AND LOOSE CONNECTIONS.
24 VOLTS AT SPST RELAY
TERMINALS '1' AND '3'?
24 VOLTS AT SUCTION
PRESSURE SWITCH
TERMINAL 'NC'?
NO
24 VOLTS AT BOTH L.W.C.O.
TERMINALS 'B-B'?
YES
NO
REFER TO L.W.C.O. MANUFACTURER'S
TROUBLESHOOTING INSTRUCTIONS
NO
FILL BOILER TO NORMAL WATERLINE
NO
GAUGE PRESSURE LESS THAN LIMIT CUT-IN SETTING?
ALLOW SYSTEM PRESSURE TO FALL BELOW LIMIT CUT-IN
PRESSURE, OR INCREASE LIMIT CUT-IN SETTING.
CONTINUITY ACROSS FLAME
ROLLOUT SWITCH (FRS)?
YES
NO
NO
YES
YES
NO
YES
REPLACE THERMOSTAT
AFTER CHECKING FOR
BROKEN WIRES AND
LOOSE CONNECTIONS.
YES
24 VOLTS AT SPST RELAY
COIL?
NO
24 VOLTS ACROSS
TRANSFORMER BLUE AND
YELLOW WIRES?
REPLACE TRANSFORMER
AFTER CHECKING FOR
BROKEN WIRES AND
LOOSE CONNECTIONS.
NO
PROVIDE POWER TO
BOILER
120 VOLTS ACROSS
TRANSFORMER BLACK
AND WHITE WIRES?
YES
CAUTION
REPLACE FLAME ROLLOUT SWITCH. DETERMINE CAUSE OF EXCESSIVE
TEMPERATURE (BLOCKED FLUE, EXCESSIVE RATE CAUSED BY HIGH
MANIFOLD PRESSURE OR OVERSIZED ORIFICES, SUCTION PRESSURE
SWITCH FAILURE, ETC.) BEFORE PLACING BOILER IN OPERATION.