Install Instructions

Troubleshooting (continued)
Display
Condition Diagnostics Corrective Action(s)
HIGH TEMP
LIMIT
Boiler temperature sensor
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setting (no higher than
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Reset using manual reset screen
on display.
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Verify all isolation valves are open and circulators are connected to the
control module properly.
Verify external controls are installed per manufacturer’s instructions, all
applicable codes, and sound industry practices.
Verify water pipe is installed correctly per instructions in this manual.
Verify proper circulator sizing for boiler size and system requirements.
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loose connections.
FLAME FAULT
Occurs if flame is detected
when there should be no
flame.
Reset using manual reset screen
on display.
Burner may be operating too hot due to incorrect combustion. Inspect
flame and conduct combustion test.
Force boiler into hi-fire. Check flue gases with combustion analyzer and
correct using the maintenance and startup procedure in this manual.
Verify FLAME SIGNAL value quickly goes to zero on the DIAGNOSTICS -
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Check for flame at burner via flame current with burner off. Turn boiler
off and watch flame through observation port. If flame continues after
shutdown replace gas valve and venturi.
GAS VALVE
FAULT
The control module has
detected a problem with its
gas valve output circuit.
Control will automatically retry;
lockout if retry unsuccessful;
retry 1 hour after lockout —
restart if condition cleared, but
lockout requiring manual reset if
condition still present.
Requires manual reset if control is
in lockout.
Check wire harness connections between gas valve and control module.
Check resistance between control and gas valve.
Disconnect low-voltage wires connected to the low voltage field-wired
connectors. Check all wire leads from system from system for stray
voltage. Any voltage in excess of 0.5 volts will cause gas valve fault
failures. Correct the cause of stray voltages before reconnecting wires.
After correcting problem, check to see if gas valve fault issue is corrected.
If lockout reoccurs replace control module.
BLOWER FAULT Blower unable to reach
required speed or does not
reach 0 RPM when turned
off.
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— The blower will not rotate
without a low voltage signal.
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blower wire harness will not
allow or cause the blower
to rotate.
Reset using manual reset screen
on display; control module will
check again after 1 hour and will
automatically restart if condition
is corrected.
Check wire harness for loose connections and pin engagement at
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and at control module and check continuity between ends. Blower is
connected to both low voltage and line voltage harness.
Check Diagnostics - Inputs screen with boiler in standby mode and
blower not running. If BLOWER SPEED is not 0 RPM replace blower.
If blower does not rotate during ignition sequence check for 120V power
at blower connection. If 120Vac power is present at blower motor and it
doesn’t start, replace blower. Check power at control module. If 120Vac
is not present at control module when boiler is powered, replace control
module. Refer to repair parts section.
Troubleshooting (continued)
&IGURE Troubleshooting suggestions for %#/ boilers — &AULTDISPLAYSDIAGNOSTICSANDCORRECTIVEACTIONS
Part number 550-142-122/0513
96
TM
GAS-FIRED WATER BOILER — Boiler Manual