Carrier 58MVC - Manual (Page 13)

13
BEFORE YOU REQUEST A
SERVICE CALL
If your furnace is not operating or not performing properly, you
may save the expense of a service call by checking a few things
yourself before calling for service.
For Insufficient Airflow:
S Check for dirty air filter(s).
S Check for blocked return--air or supply--air grilles
throughout your home. Ensure they are open and
unobstructed.
If problem still exists, call your dealer for service.
If Furnace Fails to Operate:
Follow this checklist step by step, advancing to the next step only
if furnace fails to start.
S Check thermostat for proper temperature. Is thermostat
set above room temperature?
S Is thermostat set on HEAT?
S Check fuses and circuit breakers. Is electrical supply
on?
S Is manual shutoff valve in gas supply pipe in open
position? (Follow start--up procedures if you open gas
valve.)
NOTE: Turn off electrical supply before continuing with
checklist.
S Is control switch on gas valve in ON position? (Follow
startup procedures if you must reset switch to ON
position.)
S Check manual reset flame rollout switch located on the
burner box. If furnace has experienced high
temperature conditions, this switch will shut off the
furnace. Reset it by pushing the button on the switch. If
it trips again, shut down the furnace and call for
service. See “Shutting Down Your Furnace” section in
this manual.
S Check for obstructions around the vent termination
outside the structure.
If the furnace still fails to operate, call your service representative.
For your convenience, record the furnace product and serial
numbers on back page. Should you ever require service, you will
have ready access to the information needed by your service
representative.
This furnace has a light--emitting--diode (LED) status code
display to aid the installer, service technician, or homeowner
while installing or servicing the unit. The LED code can be seen
by removing the main furnace door and viewing the LED
through the view port in the blower access panel. (See Fig. 2.)