Carrier 58MVP - Manual (Page 8)

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Fig. 4—Service Label/Fault Code Instructions
A99243b
A99243
To initiate the component test sequence, shut "OFF" the room thermostat or disconnect the "R"
thermostat lead. Put setup switch "SW-6" in the "ON" position to start the component test sequence.
Once initiated the main board will turn "ON" the inducer motor-low speed, inducer motor-high speed,
hot surface ignitor, blower motor-low speed, and blower motor-high speed for 15-20 seconds each.
When component test is completed one or more of the following codes will flash. Gas Valve and
Humidifier will not be turned on.
CODE
DESCRIPTION
11 Indicates inducer and blower motor tested OK. Visual check of hot surface ignitor required.
SETUP ERROR - Same as code 22 above.
BLOWER OUTSIDE VALID SPEED RANGE - Indicates blower motor failed test. Check blower, wiring,
and control center.
INDUCER OUTSIDE VALID SPEED RANGE - Indicates inducer motor failed test. Check inducer,
wiring and control center. 22
41
42
To repeat component test turn setup switch "SW-6" "OFF" and then back "ON". After component test is
completed put setup switch "SW-6" in the "OFF" position and reconnect the "R" thermostat lead.
320624-101 REV. J
COMPONENT TEST
STATUS CODE EXAMPLE
=
42 FAULT
HUM
G R Y/Y2 W/W1 C W2
MALFUNCTION
MICROPROCESSOR
RED LED2
EMER HEAT
RED LED1
(2) (4)
COUNT THE NO.
OF FLASHES
GREEN LED4
LOW HEAT
YELLOW LED3
HIGH HEAT
4
3
2
1
FU
S
E
3
2
1 OF
F
3
2
1 OF
F
1
234
5
6
7
8
OF
F
SE
T
U
P S
W
,(SW
1
-8
)
INDUCER OUTSIDE VALID
SPEED RANGE
OM
24 V
COUNT THE NO.
OF FLASHES
DE
DEHUM
34 IGNITION PROVING FAULT - Control will try three more times before a lockout #14 occurs.
Check for: - Gas valve defective or gas valve turned "OFF".
- Defective Hot Surface Ignitor
- Manual valve shut-off.
- Low inlet gas pressure - Flame sensor must be ungrounded.
- Green wire MUST be connected to furnace sheet metal.
- Proper flame sense microamps (.5 microamps D.C. minimum, 4.0 - 6.0 nominal in HIGH HEAT)
- Inadequate flame carryover or rough ignition. - Control ground continuity
- Oxide buildup on flame sensor (clean with fine steel wool.)
41 BLOWER OUTSIDE VALID SPEED RANGE - Indicates the blower is not operating at the calculated
RPM. If this fault occurs in conjunction with fault #44 check wiring to motor otherwise refer to
the trouble-shooting guide.
42 INDUCER OUTSIDE VALID SPEED RANGE - Indicates the inducer is not operating at the
calculated RPM, or has not started within 10 seconds after a call for heat. Check wiring to
motor otherwise refer to the trouble-shooting guide.
43 PRESSURE SWITCH CALIBRATION FAULT- Indicates the low and high pressure switch "make"
points during high heat purge are not within the calibration range.
Check for:
- Plugged condensate drain.
- Water in vent piping, possibly sagging pipe.
- Improper pressure switch wiring or pressure switch tubing connections.
- Failed or "Out of Calibration" pressure switches.
44 BLOWER CALIBRATION FAULT - Indicates the calculated blower speed is below 250 or above
1300 RPM. Unit will default to low or high heat mode if possible. If this fault occurs in conjunction
with fault #41 check wiring to motor otherwise refer to the trouble-shooting guide. If this fault
occurs by itself check for undersized ductwork, or excessive static caused by a dirty filter, or
closed registers.
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