Regular Dealer Maintenance - Carrier 58TUA User's Information Manual

BEFORE YOU REQUEST A
"SERVICE CALL''
Before you call for service, check for several
easily solved problems:
• Check for sufficient airflow. Check the air filter for dirt.
Check for blocked return-air or supply-air grilles. Be sure
they are open and unobstructed. If this isn't the cause of the
problem, call your servicing dealer.
If your furnace isn't operating at all, check the following list
for easily solved problems:
• Is your thermostat set above room temperature? Is the
switch in the HEAT position?
• Is the electrical power supply switch on? Is the blower
access door firmly in place? Are any fuses blown? (There is a
fuse on the furnace control.) Has a circuit breaker tripped?
• Is the manual shut-off valve in the gas supply pipe leading to
the furnace open? Does the lever point in the same direction that
the pipe runs (open)? Or is it at a right angle to the pipe (closed)?
NOTE: Before proceeding with the next checks, turn off the
electrical power supply to the furnace. Remove access doors.
• Is the control knob or switch on the gas valve turned to the
ON position? If this or the preceding check shows an interrup-
tion in the gas supply, make sure the gas has not been shut off
for safety reasons. If nothing else seems to be wrong, follow the
startup procedures found on pages 4 and 5 of this booklet.
• If for some reason the vent is blocked, the draft safeguard
switch will shut off the furnace. Reset the switch by pushing
the button located on top of the switch. See page 2 or 3 for
switch location.
If the switch trips a second time, turn off the furnace and call
for service.
• Downflow/Horizontal Only—Check the manual reset aux-
iliary limit switch located on the blower housing. If the blower
motor fails, this switch will shut off the furnace. Reset it by
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pushing the button on the switch. If it trips again, turn off the
furnace and call for service.
• Check the manual reset flame rollout switch(es) located near
the burners. If the furnace has experienced a high-temperature
condition due to inadequate combustion air, these switches will
shut off the furnace. Reset the switch(es) by pushing the button
on the switch. If the switch trips a second time, turn off the
furnace and call for service.
• If your furnace still fails to operate, call your servicing deal-
er for troubleshooting and repairs. Tell your dealer the model
and serial numbers for your furnace. (You should have them
recorded on page 8 of this booklet.) By knowing exactly which
furnace you have, the dealer may be able to offer suggestions
over the phone or save valuable time through knowledgeable
preparation for the service call.
• Your furnace control board has an LED fault code light
that indicates the furnace status. The LED will flash short and
long flashes. Look through the sight glass on the furnace door
and determine the code (number of short and long flashes). Give
the code and furnace model number to your dealer when you
call. By knowing exactly which furnace you have and the LED
code being displayed, your dealer can save valuable time
through knowledgeable preparation for the service call.

Regular dealer maintenance

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In addition to the type of routine maintenance you might be
willing to do, your furnace should be inspected regularly by a
properly trained service technician. A semiannual inspection
(or annual inspection, at least) should include the following:
1. Inspection of all flue product passages including the burn-
ers, heat exchanger, relief box, and vent pipe.
2. Inspection of all combustion and ventilation air
passages and openings.
3. Close check of all gas pipes leading to and inside of your
furnace.
4. Inspection, cleaning, and lubrication (when required) of
the blower motor and wheel.
NOTE: Refer to the unit Service Procedures for blower motor
oiling information. When required, the motor must be oiled by
a qualified service technician.
5. Routine inspection and cleaning/replacement of the air filter.
6. Inspection of all supply- and return-air ducts for obstruc-
tions, air leaks, and insulation. Any problems found should
be resolved at this time.
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