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If the integrated ignition control in this unit encounters an
diagnostic LED. If diagnostic LED indicates an internal fault,
check power supply to unit for proper voltage, check all fus-
es, circuit breakers and wiring. Disconnect electric power
replace control.
An external lockout occurs if the integrated ignition control
determines that a measurable combustion cannot be estab-
-
tion, the gas valve is de-energized, 30 second inter-purge
cycle is completed, and ignition is re-attempted. The control
will repeat this routine three times if a measurable combus-
-
duced draft blower and go into a lockout state.
circulator blower at the heat speed and then begin a new igni-
attempts, the control will recycle the ignition sequence.
ignition attempts. The integrated control will automatically
reset after one hour, or it can be reset by removing the ther-
mostat signal or disconnecting the electrical power supply
external lockout, perform the following checks:
coating on the sensor. Remove the sensor and careful-
ly clean with steel wool.
faulty limit, or a failed circulator blower can cause this
power during a heating cycle may also cause the aux-
iliary limit to open. The automatic reset secondary limit
is located on top of the circulator blower assembly.
-
es, blocked or cracked heat exchanger, a failed induced
protection device is a manual reset limit located on the
determined and corrected before resetting the limit.
Check wiring for opens/shorts and miswiring.
If you have to frequently reset your
gas/electric package unit, it means that a problem exists that
information.
A pressure switch stuck open can be caused by a faulty
pressure switch, faulty wiring, a disconnected or damaged
a faulty induced draft blower.
If the control senses an open pressure switch during the pre-
purge cycle, the induced draft blower only will be energized.
If the pressure switch opens after ignition has begun the gas
begins, and the ‘induced draft blower remains on. The diag-
A stuck closed pressure switch can be caused by a faulty
pressure switch or faulty wiring. If the control encounters a
pressure switch stuck closed, the induced draft blower re-
A primary limit will open due to excessive supply air tem-
total external duct static, blower motor, blower motor speed
-
cally reset once the temperature falls below a preset level.
If a limit switch opens, the gas valve is immediately de-en-
ergized, the induced draft and air circulating blowers are en-
ergized. The induced draft and air circulator blowers remain
energized until the limit switch re-closes. The diagnostic
same call for heat, the ignition control will lock out for one
-
bustion and air circulator blowers are energized. The diag-
-
cate this condition. The control can be reset by removing the
power supply to the unit or it will automatically reset after one
hour. Miswiring is the probable cause for this fault.
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