Carrier 58ZAV - Manual (Page 8)

If holes are found—or if the vent pipe is obstructed or is not
connected—^toxic fumes can escape into your home. DO
NOT OPERATE YOUR FURNACE. Call your dealer for
service. A failure to follow this warning could result in per­
sonal injury or death.
4. Replace the access doors and restore electrical power to
the furnace. Be sure bottom door flange is inside of the fur­
nace casing. (See Fig. 14, 15, and 23.)
5. Start the furnace and observe its operation. If possible,
watch the burner flames. Are they burning bright blue? If
not (or if you suspect some other malfunction), call your
servicing dealer.
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, 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 ac­
cess door firmly in place? Are any fuses blown? (There is a fuse
on the furnace control board.) 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 right angles (closed)?
NOTE: Before proceeding with the next checks, turn OFF the
electrical power supply to the furnace. Remove the access
doors.
□ Is the control knob on the gas valve turned to the ON posi­
tion? If this or the preceding check shows an interruption 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 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 auxiliary limit switch located on the blower housing. If the
blower motor fails, this switch will shut off the furnace. Reset it
by pushing the button on the switch. If it trips again, turn off
the furnace and call for service.
□ Check the manual-reset limit switch(es) located near the
burners. If the furnace has experienced a high-temperature con­
dition, 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 fur­
nace and call for service.
□ If your furnace still fails to operate, call your servicing dealer
for troubleshooting and repairs. Tell your dealer the model and
serial numbers for your furnace. (You should have them re­
corded on page 2 of this booklet.) By knowing exactly which fur­
nace you have, the dealer may be able to offer suggestions over
the phone, or save valuable time through knowledgeable prepa­
ration for the service call.
REGULAR DEALER MAINTENANCE
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. An annual inspection (or
semiannual inspection, at least) should include the following:
1. Inspection of all flue product passages—including the
burners, 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.
7. Inspection of furnace installation for proper support and
any obvious deterioration of the furnace. The support
must be sound and without sags, gaps, cracks, etc., around
the furnace base so as to provide an air seal between the
support and furnace.
8. A check for loose connections attaching individual compo­
nents. Inspection of all electrical wiring and their
connections.
9. Operational check of the furnace itself to determine work­
ing condition. Repair or adjustment should be made at
this time.
Ask your servicing dealer for further details about an economi­
cal service contract that covers seasonal inspections.