Carrier 58VCA - Manual (Page 9)

1. Combustion box diffuser plate missing or backwards.
2. Pilot flame adjustment.
3. Recirculation of combustion products at vent termination.
Code 41 —Blower outside valid speed range.
Indicates blower is not operating at the calculated or default rpm.
If this fault occurs in conjunction with fault code 44, check wiring
to motor—otherwise refer to the troubleshooting guide.
If this fault occurs by itself, check torque taps on motor. Normal
settings are White on pin-1, Black on pin-10, and Red on pin-11
unless used with a variable-speed cooling system.
Code 42—Inducer outside valid speed range.
Indicates inducer is not operating at the calculated rpm or has not
started within 10 sec after a “call for heat.”
Check the following before referring to the troubleshooting guide:
1. Continuous pilot spark.
2. High-tension lead too close to wiring harness.
Code 43 — Inducer rpm ratio outside valid range.
Indicates the low- and high-pressure switch “make” points during
purge are not within the calibration range.
Check the following before referring to the troubleshooting guide:
1. Plugged condensate drain.
2. Water in vent piping (possibly sagging piping).
3. Pressure switch wiring or tubing connections.
4. Failed or out-of-calibration pressure switches.
Code 44 —Blower calibration fault.
Indicates calculated blower speed is below 300 or above 1300 rpm.
Unit will default to either mode if possible.
If this fault occurs in conjunction with fault 41, check wiring to
motor. Otherwise, refer to troubleshooting guide.
If this fault occurs by itself, check for excessive static pressure
caused by dirty filters or undersized ductwork.
Using these fault codes, the owner may save the expense of a
service call by following the procedures provided in the User’s
Manual. A service technician can follow the steps furnished in the
appropriate section of the trouble-shooting guide when correcting
the problem.
NOTE: If the fault history is not cleared during servicing, the
microprocessor will clear it internally after 5 heating cycles have
been successfully completed without the fault occurring. This is
done to prevent the storage of useless fault codes in the service
history.
Step 8—Winterizing
A CAUTION
The unit must not be installed, operated, and then turned off
and left off in an unoccupied structure during cold weather
when the temperature drops to 32° F and below. Freezing
condensate left in the furnace will damage the equipment.
If the furnace will be off for an extended period of time in a
structure where the temperature will drop to 32° F or below,
winterize as follows:
1. Mix a solution of equal amounts of ethylene glycol (Prestone
II antifreeze/coolant or equivalent) and water.
2. Turn OFF electrical supply to furnace.
3. Remove control access door.
4. Disconnect drain tube from bottom of inducer outlet box/el-
bow.
5. Insert funnel in drain tube and pour antifreeze/water solution
into furnace until it is visible at point where condensate enters
open drain.
6. Reconnect drain tube to outlet box.
7. Replace control access door.