Fault code 22, Fault code 23 – Carrier 58MVP User Manual
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Fault Code 22
SETUP ERROR—This fault indicates that setup switches SW-1 or SW-6 are ON when they should be OFF. The
following combinations will cause the fault:
•
Thermostat call with SW-1 ON.
•
Thermostat call with SW-6 ON.
•
SW-1 and SW-6 both ON together.
STEP
ACTION
YES
NO
GO TO
1.
Turn power off and remove blower access panel.
—
—
2
2.
Make sure thermostat is NOT calling for heating or cooling. Disconnect all thermostat terminal leads
to make sure.
—
—
3
3.
Is setup switch SW-1 in ON position?
4
6
—
4.
Put setup switch SW-1 in OFF position.
—
—
5
5.
Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.
—
—
INDEX
6.
Is setup switch SW-6 in ON position?
7
8
—
7.
Put setup switch SW-6 in OFF position.
—
—
5
8.
Replace furnace control board.
—
—
5
Fault Code 23
INVALID BLOWER AIRFLOW SELECTION—This fault indicates improper A/C or CF switch setting. The -14
units can deliver sufficient airflow for 1-1/2 to 3-1/2 tons A/C and 600 to 1400 CFM for continuous fan. The -20
unit can deliver sufficient airflow for 2 to 5 tons A/C and 800 to 2000 CFM for continuous fan. If fault code is
flashing, unit still operates, but it defaults to closest allowable airflow.
NOTE:
Boards with date codes of 9506 or later will flash fault code and set continuous fan airflow to same airflow as A/C if continuous fan
is adjusted to a higher airflow than A/C setting.
STEP
ACTION
YES
NO
GO TO
1.
Turn power off and remove blower access panel.
—
—
2
2.
Are air conditioning select switches A/C set properly? (See Table 2.)
5
3
—
3.
Set air conditioning select switches A/C for proper tonnage as required by condensing unit.
—
—
4
4.
Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.
—
—
INDEX
5.
Are continuous fan select switches CF set properly? (See Table 3.)
7
6
—
6.
Set continuous fan select switches CF for desired airflow. This setting should normally be set to DE-
FAULT position unless a 2-speed AC/HP is part of system. Use Table 4 for reference on 2-speed
AC/HP airflow requirements.
—
—
4
7.
Are continuous fan select switches CF set to a higher airflow than air conditioning select switches
A/C? (See Tables 2 and 3.)
6
8
—
8.
Is furnace a 100 size?
11
9
—
9.
The problem is in the A/C or CF selection circuit. The maximum cooling or continuous fan airflow for
this unit will be delivered.
—
—
10
10.
Jiggle A/C and CF switches back and forth. If fault code continues to flash, replace furnace control
board.
—
—
4
11.
The problem is in the A/C or CF selection circuit. The minimum cooling or continuous fan airflow for
this unit will be delivered.
—
—
12
12.
Jiggle A/C and CF switches back and forth. If fault code continues to flash, replace furnace control
board.
—
—
4
18